Whoops Core

adapters/bukkit/plugin/src/main/java/art/arcane/iris/core/commands/CommandObject.java

@@ -38,6 +38,7 @@ import art.arcane.iris.engine.object.IrisObject;
 import art.arcane.iris.engine.object.IrisObjectPlacement;
 import art.arcane.iris.engine.object.IrisObjectPlacementScaleInterpolator;
 import art.arcane.iris.engine.object.IrisObjectRotation;
+import art.arcane.iris.engine.object.IrisObjectScale;
 import art.arcane.iris.engine.object.TileData;
 import art.arcane.iris.platform.bukkit.BukkitBlockState;
 import art.arcane.iris.spi.PlatformBlockState;
@@ -51,6 +52,7 @@ import art.arcane.volmlib.util.director.DirectorOrigin;
 import art.arcane.volmlib.util.director.annotations.Director;
 import art.arcane.volmlib.util.director.annotations.Param;
 import art.arcane.iris.util.common.director.specialhandlers.ObjectHandler;
+import art.arcane.iris.util.common.director.specialhandlers.ObjectScaleHandler;
 import art.arcane.iris.util.common.director.specialhandlers.ObjectTargetHandler;
 import art.arcane.iris.util.common.format.C;
 import art.arcane.iris.util.common.math.Direction;
@@ -551,17 +553,21 @@ public class CommandObject implements DirectorExecutor {
             boolean edit,
             @Param(description = "The amount of degrees to rotate by", descriptionKey = "iris.director.commandobject.param.amount_degrees_rotate_by", defaultValue = "0")
             int rotate,
-            @Param(description = "The factor by which to scale the object placement", descriptionKey = "iris.director.commandobject.param.factor_by_which_scale_object_placement", defaultValue = "1")
+            @Param(description = "Explicit scale factor, or dimension to inherit the current Iris world's factor", descriptionKey = "iris.director.commandobject.param.factor_by_which_scale_object_placement", defaultValue = "dimension", customHandler = ObjectScaleHandler.class)
-            double scale
+            Double scale
 //            ,
 //            @Param(description = "The scale interpolator to use", descriptionKey = "iris.director.commandobject.param.scale_interpolator_use", defaultValue = "none")
 //            IrisObjectPlacementScaleInterpolator interpolator
     ) {
         IrisObject o = IrisData.loadAnyObject(object, data());
+        Engine placementEngine = engine();
+        double factor = scale == null
+                ? placementEngine == null ? 1D : placementEngine.getDimension().getAllObjectScaleFactor()
+                : IrisObjectScale.requireValidFactor(scale, "scale");
         double maxScale = Double.max(10 - o.getBlocks().size() / 10000d, 1);
-        if (scale > maxScale) {
+        if (factor > maxScale) {
             sender().sendMessage(IrisLanguage.text(BukkitCommandMessagesExtended.COMMAND_OBJECT_INDICATED_SCALE_EXCEEDS_MAXIMUM_DOWNSCALED_MAXIMUM, MessageArgument.untrusted("maxScale", maxScale)));
-            scale = maxScale;
+            factor = maxScale;
         }
 
         IrisObjectPlacement placement = new IrisObjectPlacement();
@@ -581,14 +587,16 @@ public class CommandObject implements DirectorExecutor {
 
         Map<Block, BlockData> futureChanges = new HashMap<>();
 
-        if (scale != 1) {
+        if (factor != 1D) {
-            o = o.scaled(scale, IrisObjectPlacementScaleInterpolator.TRICUBIC);
+            o = scale == null ? IrisObjectScale.getFixed(o, factor)
+                    : new IrisObjectScale().setSize(factor)
+                    .setInterpolation(IrisObjectPlacementScaleInterpolator.TRICUBIC).get(new RNG(), o);
         }
 
         // Block writes must run on the thread owning the target chunk; the undo log stays global.
         final IrisObject placed = o;
         if (!J.runAt(block, () -> {
-            placed.place(block.getBlockX(), block.getBlockY() + (int) placed.getCenter().getY(), block.getBlockZ(), createPlacer(block.getWorld(), futureChanges, null), placement, new RNG(), null);
+            placed.place(block.getBlockX(), block.getBlockY() + (int) placed.getCenter().getY(), block.getBlockZ(), createPlacer(block.getWorld(), futureChanges, null), placement, new RNG(), placed.getLoader());
             J.runGlobal(() -> Iris.service(ObjectSVC.class).addChanges(futureChanges));
 
             if (!edit) {

adapters/modded-common/src/main/java/art/arcane/iris/modded/command/ModdedObjectCommands.java

@@ -415,7 +415,8 @@ public final class ModdedObjectCommands {
         placement.setRotation(IrisObjectRotation.of(0, rotation, 0));
         ModdedObjectPlacer placer = new ModdedObjectPlacer(level, engine);
         try {
-            object.place(target.getX(), target.getY() + object.getCenter().getY(), target.getZ(), placer, placement, new RNG(), null);
+            object = placement.scaleObject(new RNG(), object, engine == null ? null : engine.getDimension());
+            object.place(target.getX(), target.getY() + object.getCenter().getY(), target.getZ(), placer, placement, new RNG(), object.getLoader());
         } catch (Throwable e) {
             ModdedIrisLog.error("Iris paste failed for {}", key, e);
             ModdedObjectUndo.record(player == null ? ModdedObjectUndo.CONSOLE : player.getUUID(), level, placer.undoSnapshot());

core/src/main/java/art/arcane/iris/core/loader/ResourceLoader.java

@@ -418,7 +418,7 @@ public class ResourceLoader<T extends IrisRegistrant> implements MeteredCache {
             JSONObject parsed = new JSONObject(rawText);
             JsonSchemaValidator.validateTopLevelKeys(parsed, rawText, j, resourceTypeName, objectClass);
             if (objectClass == IrisDimension.class) {
-                PackValidator.requireValidStaticObjects(manager.getDataFolder(), name, parsed);
+                PackValidator.requireValidObjectSettings(manager.getDataFolder(), name, parsed);
             }
             T t = getManager().getGson()
                     .fromJson(preprocess(parsed).toString(0), objectClass);

core/src/main/java/art/arcane/iris/core/pack/PackDimensionValidator.java

@@ -19,6 +19,7 @@
 package art.arcane.iris.core.pack;
 
 import art.arcane.iris.engine.object.IrisDimensionType;
+import art.arcane.iris.engine.object.IrisObjectScale;
 import art.arcane.iris.engine.object.IrisWorldBoundary;
 import art.arcane.volmlib.util.json.JSONArray;
 import art.arcane.volmlib.util.json.JSONObject;
@@ -57,6 +58,7 @@ final class PackDimensionValidator {
             validateDimensionHeights(packFolder, dimensionKey, dimJson, blockingErrors);
             validateWorldBoundary(dimensionKey, dimJson, blockingErrors);
             validateStaticObjects(packFolder, dimensionKey, dimJson, blockingErrors);
+            validateObjectScaleFactor(dimensionKey, dimJson, blockingErrors);
             validateDimensionStack(packFolder, dimensionKey, dimJson, dimensionKeys, blockingErrors);
 
             JSONArray regionsArray = dimJson.optJSONArray("regions");
@@ -102,6 +104,11 @@ final class PackDimensionValidator {
         }
     }
 
+    static void validateObjectScaleFactor(String dimensionKey, JSONObject dimension, List<String> errors) {
+        validateFiniteNumber(dimension, "allObjectScaleFactor", IrisObjectScale.MINIMUM_FACTOR,
+                IrisObjectScale.MAXIMUM_FACTOR, "Dimension '" + dimensionKey + "'", errors);
+    }
+
     static void validateDimensionStack(File packFolder, String dimensionKey, JSONObject dimension, Set<String> dimensionKeys,
                                        List<String> blockingErrors) {
         if (!dimension.has("dimensionStack")) {

core/src/main/java/art/arcane/iris/core/pack/PackValidator.java

@@ -86,9 +86,10 @@ public final class PackValidator {
         return validate(packFolder, false);
     }
 
-    public static void requireValidStaticObjects(File packFolder, String dimensionKey, JSONObject dimension) {
+    public static void requireValidObjectSettings(File packFolder, String dimensionKey, JSONObject dimension) {
         List<String> errors = new ArrayList<>();
         PackDimensionValidator.validateStaticObjects(packFolder, dimensionKey, dimension, errors);
+        PackDimensionValidator.validateObjectScaleFactor(dimensionKey, dimension, errors);
         if (!errors.isEmpty()) {
             throw new IllegalArgumentException(String.join("; ", errors));
         }

core/src/main/java/art/arcane/iris/core/service/TreeSVC.java

@@ -150,7 +150,8 @@ public class TreeSVC implements IrisService {
         }
 
         saplingPlane.forEach(block -> block.setType(Material.AIR));
-        IrisObject object = worldAccess.getData().getObjectLoader().load(pool.getRandom(RNG.r));
+        IrisObject object = placement.scaleObject(RNG.r,
+                worldAccess.getData().getObjectLoader().load(pool.getRandom(RNG.r)), dimension);
 
         if (object == null) {
             return;

core/src/main/java/art/arcane/iris/engine/mantle/components/IrisStructureComponent.java

@@ -477,8 +477,9 @@ public class IrisStructureComponent extends IrisMantleComponent {
         if (object == null) {
             return;
         }
-        int horizontalSpan = Math.max(1, Math.max(object.getW(), object.getD()));
+        double scale = Math.max(1D, getDimension().getAllObjectScaleFactor());
-        int verticalSpan = Math.max(1, object.getH());
+        int horizontalSpan = scaledMarkerSpan(Math.max(object.getW(), object.getD()), scale);
+        int verticalSpan = scaledMarkerSpan(object.getH(), scale);
         ObjectMarkerBounds search = intersections.expand(horizontalSpan - 1, verticalSpan - 1, worldHeight);
         KList<ObjectBlockPosition> positions = new KList<>();
         int minChunkX = Math.floorDiv(search.minX, 16);
@@ -516,6 +517,11 @@ public class IrisStructureComponent extends IrisMantleComponent {
         return decoded != null && !decoded.structureAware();
     }
 
+    static int scaledMarkerSpan(int dimension, double scale) {
+        return scale <= 1D ? Math.max(1, dimension)
+                : (int) Math.ceil(Math.max(1, dimension) * scale);
+    }
+
     static ObjectMarkerBounds markerSearchBounds(int minX, int minY, int minZ,
                                                  int maxX, int maxY, int maxZ,
                                                  int horizontalSpan, int verticalSpan,

core/src/main/java/art/arcane/iris/engine/mantle/components/MantleFloatingObjectComponent.java

@@ -188,7 +188,7 @@ public class MantleFloatingObjectComponent extends IrisMantleComponent {
             if (raw == null) {
                 continue;
             }
-            IrisObject obj0 = placement.getScale().get(rng, raw);
+            IrisObject obj0 = placement.scaleObject(rng, raw, getDimension());
             if (obj0 == null) {
                 continue;
             }
@@ -248,7 +248,7 @@ public class MantleFloatingObjectComponent extends IrisMantleComponent {
             if (raw == null) {
                 continue;
             }
-            IrisObject obj0 = placement.getScale().get(rng, raw);
+            IrisObject obj0 = placement.scaleObject(rng, raw, getDimension());
             if (obj0 == null) {
                 continue;
             }
@@ -340,7 +340,7 @@ public class MantleFloatingObjectComponent extends IrisMantleComponent {
             if (raw == null) {
                 continue;
             }
-            IrisObject obj0 = placement.getScale().get(rng, raw);
+            IrisObject obj0 = placement.scaleObject(rng, raw, getDimension());
             if (obj0 == null) {
                 continue;
             }
@@ -628,7 +628,7 @@ public class MantleFloatingObjectComponent extends IrisMantleComponent {
                         size = IrisObject.sampleSize(file);
                         sizeCache.put(objectKey, size);
                     }
-                    int reach = MantleObjectComponent.calculatePlacementReach(size, placement);
+                    int reach = MantleObjectComponent.calculatePlacementReach(size, placement, placement.getMaximumScale(getDimension()));
                     if (reach > 128 && warnedLargeObjects.add(objectKey)) {
                         IrisLogging.warn("Floating object " + objectKey + " has a large placement reach (" + reach + " blocks) and may increase memory usage!");
                     }

core/src/main/java/art/arcane/iris/engine/mantle/components/MantleObjectComponent.java

@@ -622,7 +622,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
             IObjectPlacer placer = golden ? new GoldenDebugObjectPlacer(basePlacer, scope + "/" + p.getName()) : basePlacer;
             int density = Math.max(1, p.getDensity());
             for (int i = 0; i < density; i++) {
-                IrisObject variant = p.getVariantObject(getData(), rng);
+                IrisObject variant = placement.scaleObject(rng, p.getVariantObject(getData(), rng), getDimension());
                 if (variant == null) {
                     if (golden) {
                         IrisLogging.debug("Goldendebug procedural pick: chunk=" + x + "," + z
@@ -887,7 +887,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
 
         for (int i = 0; i < density; i++) {
             attempts++;
-            IrisObject v = objectPlacement.getScale().get(rng, objectPlacement.getObject(complex, rng));
+            IrisObject v = objectPlacement.scaleObject(rng, objectPlacement.getObject(complex, rng), getDimension());
             if (v == null) {
                 nullObjects++;
                 if (traceRegen) {
@@ -1030,7 +1030,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
 
         for (int i = 0; i < density; i++) {
             attempts++;
-            IrisObject object = objectPlacement.getScale().get(rng, objectPlacement.getObject(complex, rng));
+            IrisObject object = objectPlacement.scaleObject(rng, objectPlacement.getObject(complex, rng), getDimension());
             if (object == null) {
                 nullObjects++;
                 if (traceRegen) {
@@ -1261,7 +1261,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
         int density = objectPlacement.getDensity(rng, minX, minZ, getData());
 
         for (int i = 0; i < density; i++) {
-            IrisObject v = objectPlacement.getScale().get(rng, objectPlacement.getObject(complex, rng));
+            IrisObject v = objectPlacement.scaleObject(rng, objectPlacement.getObject(upperCtx, rng), upperCtx.getDimension());
             if (v == null) {
                 continue;
             }
@@ -1647,7 +1647,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
     private Set<String> guessPlacedKeys(RNG rng, int x, int z, IrisObjectPlacement objectPlacement) {
         Set<String> f = new KSet<>();
         for (int i = 0; i < objectPlacement.getDensity(rng, x, z, getData()); i++) {
-            IrisObject v = objectPlacement.getScale().get(rng, objectPlacement.getObject(getComplex(), rng));
+            IrisObject v = objectPlacement.scaleObject(rng, objectPlacement.getObject(getComplex(), rng), getDimension());
             if (v == null) {
                 continue;
             }
@@ -1708,11 +1708,12 @@ public class MantleObjectComponent extends IrisMantleComponent {
             }
             radius = Math.max(radius, computePlacementRadius(
                     region.getObjects(),
+                    dimension,
                     dataProvider,
                     sizeCache,
                     warnedLargeObjects
             ));
-            radius = Math.max(radius, computeProceduralRadius(region.getProceduralObjects(), dataProvider));
+            radius = Math.max(radius, computeProceduralRadius(region.getProceduralObjects(), dimension, dataProvider));
         }
         for (IrisBiome biome : dimension.getReachableBiomes(dataProvider)) {
             if (biome == null) {
@@ -1720,17 +1721,19 @@ public class MantleObjectComponent extends IrisMantleComponent {
             }
             radius = Math.max(radius, computePlacementRadius(
                     biome.getObjects(),
+                    dimension,
                     dataProvider,
                     sizeCache,
                     warnedLargeObjects
             ));
-            radius = Math.max(radius, computeProceduralRadius(biome.getProceduralObjects(), dataProvider));
+            radius = Math.max(radius, computeProceduralRadius(biome.getProceduralObjects(), dimension, dataProvider));
         }
         return radius;
     }
 
     private int computePlacementRadius(
             KList<IrisObjectPlacement> placements,
+            IrisDimension dimension,
             DataProvider dataProvider,
             KMap<String, IrisBlockVector> sizeCache,
             KSet<String> warnedLargeObjects
@@ -1746,7 +1749,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
                     if (size == null) {
                         continue;
                     }
-                    int reach = calculatePlacementReach(size, placement);
+                    int reach = calculatePlacementReach(size, placement, placement.getMaximumScale(dimension));
                     if (reach > 128 && warnedLargeObjects.add(objectKey)) {
                         IrisLogging.warn("Object " + objectKey + " has a large placement reach (" + reach + " blocks) and may increase memory usage!");
                     }
@@ -1759,7 +1762,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
         return radius;
     }
 
-    private int computeProceduralRadius(IrisProceduralObjects procedural, DataProvider dataProvider) {
+    private int computeProceduralRadius(IrisProceduralObjects procedural, IrisDimension dimension, DataProvider dataProvider) {
         if (procedural == null || procedural.isEmpty()) {
             return 0;
         }
@@ -1778,13 +1781,13 @@ public class MantleObjectComponent extends IrisMantleComponent {
                     continue;
                 }
                 IrisBlockVector size = new IrisBlockVector(variant.getW(), variant.getH(), variant.getD());
-                radius = Math.max(radius, calculatePlacementReach(size, objectPlacement));
+                radius = Math.max(radius, calculatePlacementReach(size, objectPlacement, objectPlacement.getMaximumScale(dimension)));
             }
         }
         return radius;
     }
 
-    static int calculatePlacementReach(IrisBlockVector size, IrisObjectPlacement placement) {
+    static int calculatePlacementReach(IrisBlockVector size, IrisObjectPlacement placement, double scale) {
         if (size == null) {
             return 0;
         }
@@ -1792,7 +1795,6 @@ public class MantleObjectComponent extends IrisMantleComponent {
             return Math.max(Math.abs(size.getBlockX()), Math.abs(size.getBlockZ()));
         }
 
-        double scale = placement.getScale() != null ? Math.max(1D, placement.getScale().getMaxScale()) : 1D;
         int width = scaledDimension(size.getBlockX(), scale);
         int height = scaledDimension(size.getBlockY(), scale);
         int depth = scaledDimension(size.getBlockZ(), scale);
@@ -1823,7 +1825,7 @@ public class MantleObjectComponent extends IrisMantleComponent {
         }
         int reach = calculatePlacementReach(
                 new IrisBlockVector(object.getW(), object.getH(), object.getD()),
-                placement);
+                placement, 1D);
         return complex.allowsNewGenerationFootprint(
                 saturatedOffset(anchorX, -reach),
                 saturatedOffset(anchorZ, -reach),
@@ -1838,10 +1840,10 @@ public class MantleObjectComponent extends IrisMantleComponent {
 
     private static int scaledDimension(int dimension, double scale) {
         int absoluteDimension = Math.abs(dimension);
-        if (scale <= 1D) {
+        if (scale == 1D) {
             return absoluteDimension;
         }
-        return (int) Math.ceil((absoluteDimension * scale) + (scale * 2D));
+        return (int) Math.ceil(absoluteDimension * scale);
     }
 
     private static int calculateTranslationReach(IrisObjectTranslate translate, IrisObjectRotation rotation, boolean rotateVertically) {

core/src/main/java/art/arcane/iris/engine/object/IrisDimension.java

@@ -186,6 +186,10 @@ public class IrisDimension extends IrisRegistrant {
     @MaxNumber(16)
     @Desc("Minimum surface-support buffer, in blocks, applied to every surface object placement in this dimension. A placement may ask for more but never less.")
     private int objectSurfaceSupportBuffer = 2;
+    @MinNumber(IrisObjectScale.MINIMUM_FACTOR)
+    @MaxNumber(IrisObjectScale.MAXIMUM_FACTOR)
+    @Desc("Default size factor for objects in this dimension. 0.5 halves their size and 2 doubles it. Any explicit object or placement scale, including 1, overrides this factor. Jigsaw structures are excluded.")
+    private double allObjectScaleFactor = 1D;
     @Desc("The world environment")
     private IrisEnvironment environment = IrisEnvironment.NORMAL;
     @RegistryListResource(IrisRegion.class)
@@ -319,6 +323,16 @@ public class IrisDimension extends IrisRegistrant {
         return staticObjectLayer.aquire(() -> IrisStaticObjectLayer.compile(this, data));
     }
 
+    public double getAllObjectScaleFactor() {
+        return IrisObjectScale.requireValidFactor(allObjectScaleFactor, "allObjectScaleFactor");
+    }
+
+    public IrisDimension setAllObjectScaleFactor(double factor) {
+        allObjectScaleFactor = IrisObjectScale.requireValidFactor(factor, "allObjectScaleFactor");
+        staticObjectLayer.reset();
+        return this;
+    }
+
     /**
      * Runs the version-content gate over every static object so the pack report lists the entries this server cannot
      * place. The static layer makes the same decision when it compiles; validation calls this on its detached loader

core/src/main/java/art/arcane/iris/engine/object/IrisObjectPlacement.java

@@ -162,8 +162,8 @@ public class IrisObjectPlacement {
     private KList<IrisObjectReplace> edit = new KList<>();
     @Desc("Translate this object's placement")
     private IrisObjectTranslate translate = new IrisObjectTranslate();
-    @Desc("Scale Objects")
+    @Desc("Explicit object scale. When omitted, the dimension's allObjectScaleFactor applies. Any authored scale, including size 1, overrides that factor.")
-    private IrisObjectScale scale = new IrisObjectScale();
+    private IrisObjectScale scale;
     @ArrayType(min = 1, type = IrisObjectLoot.class)
     @Desc("The loot tables to apply to these objects")
     private KList<IrisObjectLoot> loot = new KList<>();
@@ -363,6 +363,18 @@ public class IrisObjectPlacement {
         return data.getObjectLoader().load(pool.get(random.nextInt(pool.size())));
     }
 
+    public IrisObject scaleObject(RNG random, IrisObject object, IrisDimension dimension) {
+        return scale == null
+                ? IrisObjectScale.getFixed(object, dimension == null ? 1D : dimension.getAllObjectScaleFactor())
+                : scale.get(random, object);
+    }
+
+    public double getMaximumScale(IrisDimension dimension) {
+        return scale == null
+                ? dimension == null ? 1D : dimension.getAllObjectScaleFactor()
+                : scale.getMaxScale();
+    }
+
     public boolean matches(IrisTreeSize size, TreeType type) {
         for (IrisTree i : getTrees()) {
             if (i.matches(size, type)) {

core/src/main/java/art/arcane/iris/engine/object/IrisObjectPlacementRunner.java

@@ -125,6 +125,7 @@ final class IrisObjectPlacementRunner {
         boolean preventingDecay = placer.isPreventingDecay();
         boolean waterlogCandidate = config.isWaterloggable() || config.isUnderwater();
         boolean rawStructurePiece = config.getMode() == ObjectPlaceMode.STRUCTURE_PIECE;
+        boolean paint = yv < 0 && config.getMode() == ObjectPlaceMode.PAINT;
         boolean organicFloor = config.getMode() == ObjectPlaceMode.ORGANIC_STILT;
         boolean ceilingHang = config.getMode() == ObjectPlaceMode.CEILING_HANG;
         boolean organic = organicFloor || ceilingHang;
@@ -257,7 +258,10 @@ final class IrisObjectPlacementRunner {
                     }
                 }
             } else if (config.getMode().equals(ObjectPlaceMode.PAINT)) {
-                y = placer.getHighest(x, z, self.getLoader(), config.isUnderwater()) + rty;
+                int anchorX = x + (translating ? (int) Math.round(translateOffset.getX()) : 0);
+                int anchorZ = z + (translating ? (int) Math.round(translateOffset.getZ()) : 0);
+                y = (c != null ? c.getSurface()
+                        : placer.getHighest(anchorX, anchorZ, self.getLoader(), config.isUnderwater())) + rty;
                 if (!config.isForcePlace()) {
                     if (shouldBailForCarvingAnchor(placer, config, x, y, z)) {
                         bail = true;
@@ -302,12 +306,30 @@ final class IrisObjectPlacementRunner {
             return -1;
         }
 
+        IrisPaintSurfaceProjection paintProjection = null;
+        KList<IrisBlockVector> paintSupport = null;
+        if (paint) {
+            int buffer = config.isRequireSurfaceSupport() ? Math.max(0, config.getSurfaceSupportBuffer()) : 0;
+            int anchorX = x + (translating ? (int) Math.round(translateOffset.getX()) : 0);
+            int anchorZ = z + (translating ? (int) Math.round(translateOffset.getZ()) : 0);
+            paintProjection = IrisPaintSurfaceProjection.create(placer, new IrisPaintSurfaceProjection.Request(
+                    self.getLoader(), x + placementBounds.minX() - buffer, x + placementBounds.maxX() + buffer,
+                    z + placementBounds.minZ() - buffer, z + placementBounds.maxZ() + buffer,
+                    anchorX, y - rty, anchorZ, config.isUnderwater(), config.getHeightmap() != null));
+            if (paintProjection == null) {
+                return -1;
+            }
+            paintSupport = transformedPaintSupport(spin, translateOffset, surfaceWarp, warpHalf, x, y + yrand, z);
+        }
+
         if (yv < 0
                 && config.getCarvingSupport().supportsSurface()
                 && config.getMode() != ObjectPlaceMode.FLOATING
                 && !rawStructurePiece
-                && IrisSurfaceSupport.intersectsHydrology(oplacer, x, z, config.getTranslate(),
+                && (paint ? IrisSurfaceSupport.intersectsHydrology(oplacer, x, z, null, null,
-                        config.getRotation(), spinx, spiny, spinz, self.getSurfaceSupportOffsets())) {
+                        0, 0, 0, paintSupport)
+                        : IrisSurfaceSupport.intersectsHydrology(oplacer, x, z, config.getTranslate(),
+                        config.getRotation(), spinx, spiny, spinz, self.getSurfaceSupportOffsets()))) {
             return -1;
         }
 
@@ -325,9 +347,12 @@ final class IrisObjectPlacementRunner {
                 && !config.isUnderwater()
                 && !config.isOnwater()
                 && config.isRequireSurfaceSupport()
-                && IrisSurfaceSupport.isUnsupported(oplacer, self.getLoader(), x, z, config.getTranslate(),
+                && (paint ? IrisSurfaceSupport.isUnsupported(oplacer, self.getLoader(), x, z, null, null,
+                        0, 0, 0, paintSupport, config.getSurfaceSupportBuffer(), config.getSurfaceSupportDepth(),
+                        paintProjection)
+                        : IrisSurfaceSupport.isUnsupported(oplacer, self.getLoader(), x, z, config.getTranslate(),
                         config.getRotation(), spinx, spiny, spinz, self.getSurfaceSupportOffsets(),
-                        config.getSurfaceSupportBuffer(), config.getSurfaceSupportDepth())) {
+                        config.getSurfaceSupportBuffer(), config.getSurfaceSupportDepth()))) {
             return -1;
         }
 
@@ -351,22 +376,27 @@ final class IrisObjectPlacementRunner {
         }
 
         if (!rawStructurePiece && nativeStructureVetoes(placer, config, spin, placementBounds, translating, translateOffset, ceilingHang,
-                yv < 0 && config.getMode() == ObjectPlaceMode.PAINT, warpMargin, x, y + yrand, z)) {
+                paintProjection, surfaceWarp, warpHalf, yrand, warpMargin, x, y + yrand, z)) {
             return -1;
         }
 
-        boolean paint = yv < 0 && config.getMode() == ObjectPlaceMode.PAINT;
         WorldBounds worldBounds = null;
         if (config.isBore() || (!config.isForcePlace() && !rawStructurePiece
                 && (!config.getAllowedCollisions().isEmpty() || !config.getForbiddenCollisions().isEmpty()))) {
-            worldBounds = resolveWorldBounds(placer, config, placementBounds, paint, x, y + yrand, z);
+            worldBounds = resolveWorldBounds(placementBounds, paintProjection, yrand, x, y + yrand, z);
         }
 
         if (!config.isForcePlace() && !rawStructurePiece && (!config.getAllowedCollisions().isEmpty() || !config.getForbiddenCollisions().isEmpty())) {
             Engine engine = requireDataEngine(rdata, "collision settings");
             for (int i = worldBounds.minX(); i <= worldBounds.maxX(); i++) {
-                for (int j = worldBounds.minY(); j <= worldBounds.maxY(); j++) {
+                for (int k = worldBounds.minZ(); k <= worldBounds.maxZ(); k++) {
-                    for (int k = worldBounds.minZ(); k <= worldBounds.maxZ(); k++) {
+                    int surface = paint ? paintProjection.surfaceY(i, k) : 0;
+                    if (surface == IrisPaintSurfaceProjection.MISSING) {
+                        continue;
+                    }
+                    int minimumY = paint ? surface + placementBounds.minY() + Math.floorDiv(self.h, 2) + yrand : worldBounds.minY();
+                    int maximumY = paint ? surface + placementBounds.maxY() + Math.floorDiv(self.h, 2) + yrand : worldBounds.maxY();
+                    for (int j = minimumY; j <= maximumY; j++) {
                         String placementMarker = placer.getData(i, j, k, String.class);
                         PlacedObject p = engine.resolveObjectPlacementMarker(i, k, placementMarker);
                         if (p == null) continue;
@@ -387,8 +417,14 @@ final class IrisObjectPlacementRunner {
 
         if (config.isBore()) {
             for (int i = worldBounds.minX(); i <= worldBounds.maxX(); i++) {
-                for (int j = worldBounds.minY() - config.getBoreExtendMinY(); j <= worldBounds.maxY() + config.getBoreExtendMaxY(); j++) {
+                for (int k = worldBounds.minZ(); k <= worldBounds.maxZ(); k++) {
-                    for (int k = worldBounds.minZ(); k <= worldBounds.maxZ(); k++) {
+                    int surface = paint ? paintProjection.surfaceY(i, k) : 0;
+                    if (surface == IrisPaintSurfaceProjection.MISSING) {
+                        continue;
+                    }
+                    int minimumY = paint ? surface + placementBounds.minY() + Math.floorDiv(self.h, 2) + yrand : worldBounds.minY();
+                    int maximumY = paint ? surface + placementBounds.maxY() + Math.floorDiv(self.h, 2) + yrand : worldBounds.maxY();
+                    for (int j = minimumY - config.getBoreExtendMinY(); j <= maximumY + config.getBoreExtendMaxY(); j++) {
                         placer.set(i, j, k, IrisObject.States.air());
                     }
                 }
@@ -546,8 +582,14 @@ final class IrisObjectPlacementRunner {
                     zz += surfaceWarp.fitDouble(-warpHalf, warpHalf, i.getZ() + z, i.getY() + y, i.getX() + x);
                 }
 
-                if (yv < 0 && (config.getMode().equals(ObjectPlaceMode.PAINT)) && !B.isVineBlock(data)) {
+                if (paint) {
-                    yy = (int) Math.round(i.getY()) + Math.floorDiv(self.h, 2) + placer.getHighest(xx, zz, self.getLoader(), config.isUnderwater());
+                    int surface = paintProjection.surfaceY(xx, zz);
+                    if (surface == IrisPaintSurfaceProjection.MISSING) {
+                        continue;
+                    }
+                    if (!B.isVineBlock(data)) {
+                        yy = (int) Math.round(i.getY()) + Math.floorDiv(self.h, 2) + surface + yrand;
+                    }
                 }
 
                 if (config.isMeld() && !rawStructurePiece && !placer.isSolid(xx, yy, zz)) {
@@ -864,6 +906,26 @@ final class IrisObjectPlacementRunner {
         return !wouldReplace && (rawStructurePiece || !air);
     }
 
+    private KList<IrisBlockVector> transformedPaintSupport(SpinKernel spin, IrisBlockVector translateOffset,
+                                                          CNG warp, double half, int x, int y, int z) {
+        KList<IrisBlockVector> offsets = new KList<>();
+        for (IrisBlockVector source : self.getSurfaceSupportOffsets()) {
+            IrisBlockVector offset = source.clone();
+            spin.rotate(offset);
+            if (translateOffset != null) {
+                offset.add(translateOffset);
+            }
+            int worldX = x + (int) Math.round(offset.getX());
+            int worldZ = z + (int) Math.round(offset.getZ());
+            if (warp != null) {
+                worldX += warp.fitDouble(-half, half, offset.getX() + x, offset.getY() + y, offset.getZ() + z);
+                worldZ += warp.fitDouble(-half, half, offset.getZ() + z, offset.getY() + y, offset.getX() + x);
+            }
+            offsets.add(new IrisBlockVector(worldX - x, 0, worldZ - z));
+        }
+        return offsets;
+    }
+
     private TransformedBounds transformedBounds(SpinKernel spin, boolean translating, IrisBlockVector translateOffset,
                                                 boolean ceilingHang, int margin) {
         int sourceMinX = -self.getCenter().getBlockX();
@@ -909,13 +971,13 @@ final class IrisObjectPlacementRunner {
         return new TransformedBounds(minX - margin, maxX + margin, minY, maxY, minZ - margin, maxZ + margin);
     }
 
-    private WorldBounds resolveWorldBounds(IObjectPlacer placer, IrisObjectPlacement config, TransformedBounds bounds,
+    private WorldBounds resolveWorldBounds(TransformedBounds bounds, IrisPaintSurfaceProjection projection,
-                                           boolean paint, int x, int y, int z) {
+                                           int randomY, int x, int y, int z) {
         int minX = x + bounds.minX();
         int maxX = x + bounds.maxX();
         int minZ = z + bounds.minZ();
         int maxZ = z + bounds.maxZ();
-        if (!paint) {
+        if (projection == null) {
             return new WorldBounds(minX, maxX, y + bounds.minY(), y + bounds.maxY(), minZ, maxZ);
         }
 
@@ -923,12 +985,15 @@ final class IrisObjectPlacementRunner {
         int maximumSurface = Integer.MIN_VALUE;
         for (int worldX = minX; worldX <= maxX; worldX++) {
             for (int worldZ = minZ; worldZ <= maxZ; worldZ++) {
-                int surface = placer.getHighest(worldX, worldZ, self.getLoader(), config.isUnderwater());
+                int surface = projection.surfaceY(worldX, worldZ);
+                if (surface == IrisPaintSurfaceProjection.MISSING) {
+                    continue;
+                }
                 minimumSurface = Math.min(minimumSurface, surface);
                 maximumSurface = Math.max(maximumSurface, surface);
             }
         }
-        int paintOffset = Math.floorDiv(self.h, 2);
+        int paintOffset = Math.floorDiv(self.h, 2) + randomY;
         return new WorldBounds(minX, maxX, minimumSurface + bounds.minY() + paintOffset,
                 maximumSurface + bounds.maxY() + paintOffset, minZ, maxZ);
     }
@@ -960,7 +1025,8 @@ final class IrisObjectPlacementRunner {
      */
     private boolean nativeStructureVetoes(IObjectPlacer placer, IrisObjectPlacement config, SpinKernel spin, TransformedBounds bounds,
                                           boolean translating, IrisBlockVector translateOffset, boolean ceilingHang,
-                                          boolean paint, int warpMargin, int x, int y, int z) {
+                                          IrisPaintSurfaceProjection projection, CNG surfaceWarp, double warpHalf,
+                                          int randomY, int warpMargin, int x, int y, int z) {
         Engine engine = placer.getEngine();
         if (engine == null) {
             return false;
@@ -976,8 +1042,8 @@ final class IrisObjectPlacementRunner {
         }
 
         int worldY = y + engine.getMinHeight();
-        int envelopeMinY = paint ? Integer.MIN_VALUE : worldY + bounds.minY() - warpMargin;
+        int envelopeMinY = projection != null ? Integer.MIN_VALUE : worldY + bounds.minY() - warpMargin;
-        int envelopeMaxY = paint ? Integer.MAX_VALUE : worldY + bounds.maxY() + warpMargin;
+        int envelopeMaxY = projection != null ? Integer.MAX_VALUE : worldY + bounds.maxY() + warpMargin;
         boolean envelopeMeetsPiece = false;
         for (NativeStructureVolume volume : volumes) {
             if (volume.intersects(minX, envelopeMinY, minZ, maxX, envelopeMaxY, maxZ)) {
@@ -1010,14 +1076,24 @@ final class IrisObjectPlacementRunner {
 
                 int xx = x + (int) Math.round(i.getX());
                 int zz = z + (int) Math.round(i.getZ());
-                int yy = paint
+                int yy = y + (int) Math.round(i.getY());
-                        ? (int) Math.round(i.getY()) + Math.floorDiv(self.h, 2)
+                if (projection != null) {
-                                + placer.getHighest(xx, zz, self.getLoader(), config.isUnderwater())
+                    if (surfaceWarp != null) {
-                        : y + (int) Math.round(i.getY());
+                        xx += surfaceWarp.fitDouble(-warpHalf, warpHalf, i.getX() + x, i.getY() + y, i.getZ() + z);
+                        zz += surfaceWarp.fitDouble(-warpHalf, warpHalf, i.getZ() + z, i.getY() + y, i.getX() + x);
+                    }
+                    int surface = projection.surfaceY(xx, zz);
+                    if (surface == IrisPaintSurfaceProjection.MISSING) {
+                        continue;
+                    }
+                    if (!B.isVineBlock(state)) {
+                        yy = (int) Math.round(i.getY()) + Math.floorDiv(self.h, 2) + surface + randomY;
+                    }
+                }
                 int worldBlockY = yy + engine.getMinHeight();
 
                 for (NativeStructureVolume volume : volumes) {
-                    if (volume.containsWithin(xx, worldBlockY, zz, warpMargin)) {
+                    if (volume.containsWithin(xx, worldBlockY, zz, projection == null ? warpMargin : 0)) {
                         return true;
                     }
                 }

core/src/main/java/art/arcane/iris/engine/object/IrisObjectScale.java

@@ -43,6 +43,8 @@ import java.util.Map;
 @Desc("Scale objects")
 @Data
 public class IrisObjectScale {
+    public static final double MINIMUM_FACTOR = 0.01D;
+    public static final double MAXIMUM_FACTOR = 50D;
     private static final long CACHE_MIN_ESTIMATED_BYTES = 16L * 1024L * 1024L;
     private static final long CACHE_MAX_ESTIMATED_BYTES = 64L * 1024L * 1024L;
     private static final long CACHE_ENTRY_ESTIMATED_BYTES = 512L;
@@ -88,15 +90,32 @@ public class IrisObjectScale {
         return minimumScale != 1 || maximumScale != 1;
     }
 
+    public IrisObjectScale setSize(double size) {
+        this.size = requireValidFactor(size, "size");
+        return this;
+    }
+
+    public IrisObjectScale setMinimumScale(double minimumScale) {
+        this.minimumScale = requireValidFactor(minimumScale, "minimumScale");
+        return this;
+    }
+
+    public IrisObjectScale setMaximumScale(double maximumScale) {
+        this.maximumScale = requireValidFactor(maximumScale, "maximumScale");
+        return this;
+    }
+
     public int getMaxSizeFor(int indim) {
         return (int) Math.ceil(getMaxScale() * indim);
     }
 
     public double getMaxScale() {
-        if (size != 1) {
+        ScaleRequest request = snapshotRequest();
-            return size;
+        if (!request.shouldScale()) {
+            return 1D;
         }
-        return Math.max(minimumScale, maximumScale);
+        return request.size() != 1D ? request.size()
+                : Math.max(request.minimumScale(), request.maximumScale());
     }
 
     public IrisObject get(RNG rng, IrisObject origin) {
@@ -109,7 +128,27 @@ public class IrisObjectScale {
             return origin;
         }
 
-        int variantIndex = request.selectVariant(rng);
+        return get(origin, request, request.selectVariant(rng));
+    }
+
+    public static IrisObject getFixed(IrisObject origin, double factor) {
+        requireValidFactor(factor, "Object scale");
+        if (origin == null || factor == 1D) {
+            return origin;
+        }
+        return get(origin, new ScaleRequest(factor, 1D, 1D, 7,
+                IrisObjectPlacementScaleInterpolator.NONE), 0);
+    }
+
+    public static double requireValidFactor(double factor, String name) {
+        if (!Double.isFinite(factor) || factor < MINIMUM_FACTOR || factor > MAXIMUM_FACTOR) {
+            throw new IllegalArgumentException(name + " must be finite and between "
+                    + MINIMUM_FACTOR + " and " + MAXIMUM_FACTOR + ".");
+        }
+        return factor;
+    }
+
+    private static IrisObject get(IrisObject origin, ScaleRequest request, int variantIndex) {
         CacheKey key = CACHE.key(origin, request, variantIndex);
         CacheLookup lookup = CACHE.lookup(key);
         if (lookup.variant() != null) {
@@ -145,6 +184,9 @@ public class IrisObjectScale {
     }
 
     private ScaleRequest snapshotRequest() {
+        requireValidFactor(size, "size");
+        requireValidFactor(minimumScale, "minimumScale");
+        requireValidFactor(maximumScale, "maximumScale");
         IrisObjectPlacementScaleInterpolator configuredInterpolation = interpolation == null
                 ? IrisObjectPlacementScaleInterpolator.NONE
                 : interpolation;

core/src/main/java/art/arcane/iris/engine/object/IrisObjectTransforms.java

@@ -88,130 +88,99 @@ final class IrisObjectTransforms {
     }
 
     static IrisObject scaledAroundOrigin(IrisObject self, double scale, IrisObjectPlacementScaleInterpolator interpolation) {
-        if (!Double.isFinite(scale) || scale <= 0 || scale > 50) {
-            throw new IllegalArgumentException("Object scale must be finite, greater than zero, and at most 50");
-        }
         return scaled(self, scale, interpolation, ScaleOrigin.SAVED);
     }
 
     private static IrisObject scaled(IrisObject self, double scale, IrisObjectPlacementScaleInterpolator interpolation,
                                      ScaleOrigin origin) {
+        IrisObjectScale.requireValidFactor(scale, "Object scale");
         if (interpolation == null) {
             interpolation = IrisObjectPlacementScaleInterpolator.NONE;
         }
         boolean savedOrigin = origin == ScaleOrigin.SAVED;
-        IrisVector sm1 = new IrisVector(scale - 1, scale - 1, scale - 1);
+        List<ScaledVoxel> voxels;
-        scale = Math.max(0.001, Math.min(50, scale));
+        IrisObject output;
-        if (!savedOrigin && scale < 1) {
-            scale = scale - 0.0001;
-        }
-
-        VectorMap<PlatformBlockState> placeBlock = new VectorMap<>();
-        VectorMap<TileData> placeTile = new VectorMap<>();
-        VectorMap<IrisBlockVector> placeMax = savedOrigin && scale > 1 ? new VectorMap<>() : null;
-
-        IrisVector center;
-        IrisObject oo;
-        boolean hasTiles;
         self.readLock.lock();
         try {
-            center = new IrisVector(self.getCenter().getX(), self.getCenter().getY(), self.getCenter().getZ());
+            output = savedOrigin ? createOriginScaledObject(self, scale)
-            if (self.getH() == 2) {
+                    : createCenteredScaledObject(self, scale);
-                center = center.setY(center.getBlockY() + 0.5);
+            output.setLoadKey(self.getLoadKey());
-            }
+            output.setLoader(self.getLoader());
-            if (self.getW() == 2) {
+            output.setLoadFile(self.getLoadFile());
-                center = center.setX(center.getBlockX() + 0.5);
+            voxels = new ArrayList<>(self.blocks.size());
-            }
+            Vector3i sourceCenter = self.getCenter();
-            if (self.getD() == 2) {
+            IrisBlockVector targetCenter = new IrisBlockVector(output.getCenter().getX(),
-                center = center.setZ(center.getBlockZ() + 0.5);
+                    output.getCenter().getY(), output.getCenter().getZ());
-            }
-
-            oo = savedOrigin ? createOriginScaledObject(self, scale)
-                    : new IrisObject((int) Math.ceil((self.w * scale) + (scale * 2)), (int) Math.ceil((self.h * scale) + (scale * 2)), (int) Math.ceil((self.d * scale) + (scale * 2)));
-            oo.setLoadKey(self.getLoadKey());
-            oo.setLoader(self.getLoader());
-            oo.setLoadFile(self.getLoadFile());
-            hasTiles = !self.states.isEmpty();
             for (Map.Entry<IrisBlockVector, PlatformBlockState> entry : self.blocks) {
-                PlatformBlockState bd = entry.getValue();
                 IrisBlockVector sourcePosition = entry.getKey();
-                IrisBlockVector position = savedOrigin
+                IrisBlockVector position = savedOrigin ? sourcePosition : new IrisBlockVector(
-                        ? scaledMinimum(sourcePosition, scale)
+                        sourcePosition.getBlockX() + sourceCenter.getX(),
-                        : sourcePosition.clone().add(IrisObject.HALF).subtract(center)
+                        sourcePosition.getBlockY() + sourceCenter.getY(),
-                                .multiply(scale).add(sm1).toBlockVector();
+                        sourcePosition.getBlockZ() + sourceCenter.getZ());
-                placeBlock.put(position, bd);
+                IrisBlockVector minimum = scaledMinimum(position, scale);
-                if (placeMax != null) {
+                IrisBlockVector maximum = scaledMaximum(position, scale);
-                    placeMax.put(position, scaledMaximum(sourcePosition, scale));
+                if (!savedOrigin) {
-                }
+                    minimum.subtract(targetCenter);
-                if (hasTiles) {
+                    maximum.subtract(targetCenter);
-                    TileData tile = self.states.get(entry.getKey());
-                    if (tile == null) {
-                        placeTile.remove(position);
-                    } else {
-                        placeTile.put(position, tile);
-                    }
                 }
+                TileData tile = self.states.get(sourcePosition);
+                voxels.add(new ScaledVoxel(sourcePosition.clone(), minimum, maximum, entry.getValue(),
+                        tile == null ? null : tile.clone()));
             }
         } finally {
             self.readLock.unlock();
         }
-
+        if (scale != Math.rint(scale)) {
-        for (Map.Entry<IrisBlockVector, PlatformBlockState> entry : placeBlock) {
+            voxels.sort(Comparator.comparingInt((ScaledVoxel voxel) -> voxel.source().getBlockX())
-            IrisBlockVector v = entry.getKey();
+                    .thenComparingInt(voxel -> voxel.source().getBlockY())
-            TileData tile = hasTiles ? placeTile.get(v) : null;
+                    .thenComparingInt(voxel -> voxel.source().getBlockZ()));
-            if (scale > 1) {
+        }
-                IrisVector minimum = savedOrigin ? v : v.clone().add(center);
+        for (ScaledVoxel voxel : voxels) {
-                IrisVector maximum = savedOrigin ? placeMax.get(v) : v.clone().add(center).add(sm1);
+            writeScaledVoxel(output, voxel);
-                int minX = Math.min(minimum.getBlockX(), maximum.getBlockX());
-                int maxX = Math.max(minimum.getBlockX(), maximum.getBlockX());
-                int minY = Math.min(minimum.getBlockY(), maximum.getBlockY());
-                int maxY = Math.max(minimum.getBlockY(), maximum.getBlockY());
-                int minZ = Math.min(minimum.getBlockZ(), maximum.getBlockZ());
-                int maxZ = Math.max(minimum.getBlockZ(), maximum.getBlockZ());
-                IrisBlockVector position = new IrisBlockVector(minX, minY, minZ);
-                for (int x = minX; x <= maxX; x++) {
-                    position.setX(x);
-                    for (int z = minZ; z <= maxZ; z++) {
-                        position.setZ(z);
-                        for (int y = minY; y <= maxY; y++) {
-                            position.setY(y);
-                            oo.blocks.put(position, entry.getValue());
-                            if (hasTiles) {
-                                if (tile == null) {
-                                    oo.states.remove(position);
-                                } else {
-                                    oo.states.put(position, tile.clone());
-                                }
-                            }
-                        }
-                    }
-                }
-            } else {
-                IrisBlockVector position = savedOrigin
-                        ? v
-                        : oo.getSigned(v.getBlockX(), v.getBlockY(), v.getBlockZ());
-                oo.blocks.put(position, entry.getValue());
-                if (hasTiles) {
-                    if (tile == null) {
-                        oo.states.remove(position);
-                    } else {
-                        oo.states.put(position, tile.clone());
-                    }
-                }
-            }
         }
 
-        VectorMap<PlatformBlockState> scaledBlocks = oo.blocks;
+        VectorMap<PlatformBlockState> scaledBlocks = output.blocks;
         if (scale > 1) {
             switch (interpolation) {
-                case TRILINEAR -> trilinear(oo, (int) Math.round(scale));
+                case TRILINEAR -> trilinear(output, (int) Math.round(scale));
-                case TRICUBIC -> tricubic(oo, (int) Math.round(scale));
+                case TRICUBIC -> tricubic(output, (int) Math.round(scale));
-                case TRIHERMITE -> trihermite(oo, (int) Math.round(scale));
+                case TRIHERMITE -> trihermite(output, (int) Math.round(scale));
             }
         }
+        removeInapplicableTiles(output, scaledBlocks);
+        return output;
+    }
 
-        removeInapplicableTiles(oo, scaledBlocks);
+    private static void writeScaledVoxel(IrisObject output, ScaledVoxel voxel) {
-        return oo;
+        IrisBlockVector minimum = voxel.minimum();
+        IrisBlockVector maximum = voxel.maximum();
+        IrisBlockVector position = minimum.clone();
+        for (int x = minimum.getBlockX(); x <= maximum.getBlockX(); x++) {
+            position.setX(x);
+            for (int z = minimum.getBlockZ(); z <= maximum.getBlockZ(); z++) {
+                position.setZ(z);
+                for (int y = minimum.getBlockY(); y <= maximum.getBlockY(); y++) {
+                    position.setY(y);
+                    output.blocks.put(position, voxel.block());
+                    if (voxel.tile() == null) {
+                        output.states.remove(position);
+                    } else {
+                        output.states.put(position, voxel.tile().clone());
+                    }
+                }
+            }
+        }
+    }
+
+    private static IrisObject createCenteredScaledObject(IrisObject source, double scale) {
+        IrisObject object = new IrisObject((int) Math.ceil(source.w * scale),
+                (int) Math.ceil(source.h * scale), (int) Math.ceil(source.d * scale));
+        Vector3i center = object.getCenter();
+        object.aabb.aquire(() -> new AxisAlignedBB(
+                new IrisPosition(-center.getX(), -center.getY(), -center.getZ()),
+                new IrisPosition(object.w - center.getX() - 1, object.h - center.getY() - 1,
+                        object.d - center.getZ() - 1)));
+        return object;
     }
 
     private static IrisObject createOriginScaledObject(IrisObject source, double scale) {
@@ -499,6 +468,10 @@ final class IrisObjectTransforms {
     private record NearestBlock(int x, int y, int z, int rank, PlatformBlockState state) {
     }
 
+    private record ScaledVoxel(IrisBlockVector source, IrisBlockVector minimum, IrisBlockVector maximum,
+                               PlatformBlockState block, TileData tile) {
+    }
+
     private enum ScaleOrigin {
         DEFAULT,
         SAVED

core/src/main/java/art/arcane/iris/engine/object/IrisPaintSurfaceProjection.java

@@ -0,0 +1,138 @@
+package art.arcane.iris.engine.object;
+
+import art.arcane.iris.core.loader.IrisData;
+
+import java.util.Arrays;
+
+final class IrisPaintSurfaceProjection {
+    static final int MISSING = Integer.MIN_VALUE;
+    private static final int MAXIMUM_STEP = 4;
+    private static final int MAXIMUM_CELLS = 1 << 22;
+
+    private final Request request;
+    private final int depth;
+    private final int[] surfaces;
+
+    private IrisPaintSurfaceProjection(Request request, int[] surfaces) {
+        this.request = request;
+        depth = request.maxZ() - request.minZ() + 1;
+        this.surfaces = surfaces;
+    }
+
+    static IrisPaintSurfaceProjection create(IObjectPlacer placer, Request request) {
+        long width = (long) request.maxX() - request.minX() + 1;
+        long depth = (long) request.maxZ() - request.minZ() + 1;
+        long cells = width * depth;
+        if (width <= 0 || depth <= 0 || width > MAXIMUM_CELLS || depth > MAXIMUM_CELLS
+                || cells > MAXIMUM_CELLS || request.anchorX() < request.minX()
+                || request.anchorX() > request.maxX() || request.anchorZ() < request.minZ()
+                || request.anchorZ() > request.maxZ()) {
+            return null;
+        }
+        int[] surfaces = new int[(int) cells];
+        Arrays.fill(surfaces, MISSING);
+        IrisPaintSurfaceProjection projection = new IrisPaintSurfaceProjection(request, surfaces);
+        return projection.resolve(placer) ? projection : null;
+    }
+
+    int surfaceY(int x, int z) {
+        if (x < request.minX() || x > request.maxX() || z < request.minZ() || z > request.maxZ()) {
+            return MISSING;
+        }
+        return surfaces[index(x, z)];
+    }
+
+    private boolean resolve(IObjectPlacer placer) {
+        int[] highest = new int[surfaces.length];
+        Arrays.fill(highest, MISSING);
+        int[] pending = new int[surfaces.length];
+        int anchor = index(request.anchorX(), request.anchorZ());
+        highest[anchor] = placer.getHighest(request.anchorX(), request.anchorZ(), request.data(), request.ignoreFluid());
+        if (!accepts(placer, request.anchorX(), request.anchorZ(), request.anchorY(), highest[anchor])) {
+            return false;
+        }
+        surfaces[anchor] = request.anchorY();
+        pending[0] = anchor;
+        int count = 1;
+        for (int cursor = 0; cursor < count; cursor++) {
+            int cell = pending[cursor];
+            int x = request.minX() + cell / depth;
+            int z = request.minZ() + cell % depth;
+            int reference = surfaces[cell];
+            count = visit(placer, (long) x - 1, z, reference, highest, pending, count);
+            count = visit(placer, (long) x + 1, z, reference, highest, pending, count);
+            count = visit(placer, x, (long) z - 1, reference, highest, pending, count);
+            count = visit(placer, x, (long) z + 1, reference, highest, pending, count);
+        }
+        return true;
+    }
+
+    private int visit(IObjectPlacer placer, long candidateX, long candidateZ, int reference,
+                      int[] highest, int[] pending, int count) {
+        if (candidateX < request.minX() || candidateX > request.maxX()
+                || candidateZ < request.minZ() || candidateZ > request.maxZ()) {
+            return count;
+        }
+        int x = (int) candidateX;
+        int z = (int) candidateZ;
+        int cell = index(x, z);
+        if (surfaces[cell] != MISSING) {
+            return count;
+        }
+        if (highest[cell] == MISSING) {
+            highest[cell] = placer.getHighest(x, z, request.data(), request.ignoreFluid());
+        }
+        for (int distance = 0; distance <= MAXIMUM_STEP; distance++) {
+            long lower = (long) reference - distance;
+            if (accepts(placer, x, z, lower, highest[cell])) {
+                surfaces[cell] = (int) lower;
+                pending[count++] = cell;
+                return count;
+            }
+            long upper = (long) reference + distance;
+            if (distance > 0 && accepts(placer, x, z, upper, highest[cell])) {
+                surfaces[cell] = (int) upper;
+                pending[count++] = cell;
+                return count;
+            }
+        }
+        return count;
+    }
+
+    private boolean accepts(IObjectPlacer placer, int x, int z, long y, int highest) {
+        if (y <= Integer.MIN_VALUE || y >= Integer.MAX_VALUE || y > highest
+                || !matchesNeighbour((long) x - 1, z, y) || !matchesNeighbour((long) x + 1, z, y)
+                || !matchesNeighbour(x, (long) z - 1, y) || !matchesNeighbour(x, (long) z + 1, y)) {
+            return false;
+        }
+        if (y == highest) {
+            return request.virtualHeightmap()
+                    || solid(placer, x, (int) y, z)
+                    || !request.ignoreFluid() && y == placer.getFluidHeight(x, z);
+        }
+        if (request.virtualHeightmap()) {
+            return false;
+        }
+        return solid(placer, x, (int) y, z) && !solid(placer, x, (int) y + 1, z);
+    }
+
+    private boolean matchesNeighbour(long x, long z, long y) {
+        if (x < request.minX() || x > request.maxX() || z < request.minZ() || z > request.maxZ()) {
+            return true;
+        }
+        int neighbour = surfaceY((int) x, (int) z);
+        return neighbour == MISSING || Math.abs(y - neighbour) <= MAXIMUM_STEP;
+    }
+
+    private boolean solid(IObjectPlacer placer, int x, int y, int z) {
+        return placer.isSurfaceSolid(x, y, z) && !placer.isCarved(x, y, z);
+    }
+
+    private int index(int x, int z) {
+        return (x - request.minX()) * depth + z - request.minZ();
+    }
+
+    record Request(IrisData data, int minX, int maxX, int minZ, int maxZ,
+                   int anchorX, int anchorY, int anchorZ, boolean ignoreFluid, boolean virtualHeightmap) {
+    }
+}

core/src/main/java/art/arcane/iris/engine/object/IrisStaticObject.java

@@ -40,8 +40,8 @@ public class IrisStaticObject {
     private IrisStaticObjectRotation rotation = new IrisStaticObjectRotation();
     @MinNumber(MINIMUM_SCALE)
     @MaxNumber(MAXIMUM_SCALE)
-    @Desc("Fixed size multiplier. 1 preserves the saved size, 0.5 halves it and 2 doubles it.")
+    @Desc("Explicit fixed size multiplier. When omitted, the dimension's allObjectScaleFactor applies. An explicit 1 preserves the saved size.")
-    private double scale = 1D;
+    private Double scale;
     @Desc("Interpolation used when enlarging the object. NONE preserves blocky shapes.")
     private IrisObjectPlacementScaleInterpolator scaleInterpolation = IrisObjectPlacementScaleInterpolator.NONE;
     @ArrayType(type = IrisObjectReplace.class)
@@ -74,9 +74,8 @@ public class IrisStaticObject {
             throw new IllegalArgumentException("rotation must be an object.");
         }
         rotation.validate();
-        if (!Double.isFinite(scale) || scale < MINIMUM_SCALE || scale > MAXIMUM_SCALE) {
+        if (scale != null) {
-            throw new IllegalArgumentException("scale must be finite and between "
+            IrisObjectScale.requireValidFactor(scale, "scale");
-                    + MINIMUM_SCALE + " and " + MAXIMUM_SCALE + ".");
         }
         if (scaleInterpolation == null) {
             throw new IllegalArgumentException("scaleInterpolation must be a supported interpolation mode.");
@@ -141,12 +140,23 @@ public class IrisStaticObject {
                 .setMode(ObjectPlaceMode.STRUCTURE_PIECE)
                 .setForcePlace(true)
                 .setRotation(rotation.toRotation())
-                .setScale(new IrisObjectScale().setSize(scale).setInterpolation(scaleInterpolation))
+                .setScale(scale == null ? null
+                        : new IrisObjectScale().setSize(scale).setInterpolation(scaleInterpolation))
                 .setEdit(new KList<>(edit))
                 .setBore(bore)
                 .setSmartBore(smartBore);
     }
 
+    public IrisStaticObject setScale(Double scale) {
+        this.scale = scale == null ? null : IrisObjectScale.requireValidFactor(scale, "scale");
+        return this;
+    }
+
+    public double resolveScale(IrisDimension dimension) {
+        return scale == null ? dimension.getAllObjectScaleFactor()
+                : IrisObjectScale.requireValidFactor(scale, "scale");
+    }
+
     private static void validateEdit(IrisObjectReplace replacement, int index) {
         if (replacement.getFind() == null || replacement.getFind().isEmpty()
                 || replacement.getFind().contains(null)) {

core/src/main/java/art/arcane/iris/engine/object/IrisStaticObjectLayer.java

@@ -55,8 +55,9 @@ public final class IrisStaticObjectLayer {
                 if (object == null) {
                     throw new IllegalArgumentException("Object '" + entry.getObject() + "' could not be loaded");
                 }
-                if (entry.getScale() != 1D) {
+                double scale = entry.resolveScale(dimension);
-                    object = object.scaledAroundOrigin(entry.getScale(), entry.getScaleInterpolation());
+                if (scale != 1D) {
+                    object = object.scaledAroundOrigin(scale, entry.getScaleInterpolation());
                 } else if (entry.isSmartBore()) {
                     object = object.copy();
                 }

core/src/main/java/art/arcane/iris/engine/object/IrisSurfaceSupport.java

@@ -24,11 +24,20 @@ public final class IrisSurfaceSupport {
                                        IrisObjectTranslate translate, IrisObjectRotation rotation,
                                        int spinX, int spinY, int spinZ,
                                        List<IrisBlockVector> supportOffsets, int buffer, int minSolidDepth) {
+        return isUnsupported(placer, data, x, z, translate, rotation, spinX, spinY, spinZ,
+                supportOffsets, buffer, minSolidDepth, null);
+    }
+
+    static boolean isUnsupported(IObjectPlacer placer, IrisData data, int x, int z,
+                                 IrisObjectTranslate translate, IrisObjectRotation rotation,
+                                 int spinX, int spinY, int spinZ,
+                                 List<IrisBlockVector> supportOffsets, int buffer, int minSolidDepth,
+                                 IrisPaintSurfaceProjection projection) {
         Stencil stencil = STENCIL.get();
         if (!stencil.build(supportOffsets, translate, rotation, spinX, spinY, spinZ, Math.max(0, buffer))) {
             return true;
         }
-        return stencil.anyColumnUnsupported(placer, data, x, z, Math.max(1, minSolidDepth));
+        return stencil.anyColumnUnsupported(placer, data, x, z, Math.max(1, minSolidDepth), projection);
     }
 
     public static boolean intersectsHydrology(IObjectPlacer placer, int x, int z,
@@ -165,13 +174,14 @@ public final class IrisSurfaceSupport {
         }
 
         /** Centre-outward so the common failure, a hole right under the anchor, costs one column. */
-        private boolean anyColumnUnsupported(IObjectPlacer placer, IrisData data, int x, int z, int minSolidDepth) {
+        private boolean anyColumnUnsupported(IObjectPlacer placer, IrisData data, int x, int z, int minSolidDepth,
+                                             IrisPaintSurfaceProjection projection) {
             int maxRing = Math.max(
                     Math.max(centerX, width - 1 - centerX),
                     Math.max(centerZ, depth - 1 - centerZ));
             for (int ring = 0; ring <= maxRing; ring++) {
                 if (ring == 0) {
-                    if (isColumnUnsupported(placer, data, x, z, centerX, centerZ, minSolidDepth)) {
+                    if (isColumnUnsupported(placer, data, x, z, centerX, centerZ, minSolidDepth, projection)) {
                         return true;
                     }
                     continue;
@@ -182,14 +192,14 @@ public final class IrisSurfaceSupport {
                 int lowZ = centerZ - ring;
                 int highZ = centerZ + ring;
                 for (int sx = lowX; sx <= highX; sx++) {
-                    if (isColumnUnsupported(placer, data, x, z, sx, lowZ, minSolidDepth)
+                    if (isColumnUnsupported(placer, data, x, z, sx, lowZ, minSolidDepth, projection)
-                            || isColumnUnsupported(placer, data, x, z, sx, highZ, minSolidDepth)) {
+                            || isColumnUnsupported(placer, data, x, z, sx, highZ, minSolidDepth, projection)) {
                         return true;
                     }
                 }
                 for (int sz = lowZ + 1; sz < highZ; sz++) {
-                    if (isColumnUnsupported(placer, data, x, z, lowX, sz, minSolidDepth)
+                    if (isColumnUnsupported(placer, data, x, z, lowX, sz, minSolidDepth, projection)
-                            || isColumnUnsupported(placer, data, x, z, highX, sz, minSolidDepth)) {
+                            || isColumnUnsupported(placer, data, x, z, highX, sz, minSolidDepth, projection)) {
                         return true;
                     }
                 }
@@ -214,7 +224,8 @@ public final class IrisSurfaceSupport {
         }
 
         private boolean isColumnUnsupported(IObjectPlacer placer, IrisData data, int x, int z,
-                                            int stencilX, int stencilZ, int minSolidDepth) {
+                                            int stencilX, int stencilZ, int minSolidDepth,
+                                            IrisPaintSurfaceProjection projection) {
             if (stencilX < 0 || stencilX >= width || stencilZ < 0 || stencilZ >= depth
                     || !cells[(stencilX * depth) + stencilZ]) {
                 return false;
@@ -222,9 +233,14 @@ public final class IrisSurfaceSupport {
 
             int columnX = x + minX + stencilX;
             int columnZ = z + minZ + stencilZ;
-            int surfaceY = placer.getHighest(columnX, columnZ, data, true);
+            int surfaceY = projection == null ? placer.getHighest(columnX, columnZ, data, true)
+                    : projection.surfaceY(columnX, columnZ);
+            if (surfaceY == IrisPaintSurfaceProjection.MISSING) {
+                return false;
+            }
             for (int below = 0; below < minSolidDepth; below++) {
-                if (placer.isCarved(columnX, surfaceY - below, columnZ)) {
+                if (placer.isCarved(columnX, surfaceY - below, columnZ)
+                        || projection != null && !placer.isSurfaceSolid(columnX, surfaceY - below, columnZ)) {
                     return true;
                 }
             }

core/src/main/java/art/arcane/iris/util/common/director/specialhandlers/ObjectScaleHandler.java

@@ -0,0 +1,30 @@
+package art.arcane.iris.util.common.director.specialhandlers;
+
+import art.arcane.iris.engine.object.IrisObjectScale;
+import art.arcane.volmlib.util.director.exceptions.DirectorParsingException;
+import art.arcane.volmlib.util.director.handlers.base.DoubleHandlerBase;
+
+public final class ObjectScaleHandler extends DoubleHandlerBase {
+    @Override
+    public Double parse(String input, boolean force) throws DirectorParsingException {
+        if (input.trim().equalsIgnoreCase("dimension")) {
+            return null;
+        }
+        double factor = super.parse(input, force);
+        try {
+            return IrisObjectScale.requireValidFactor(factor, "scale");
+        } catch (IllegalArgumentException failure) {
+            throw new DirectorParsingException(failure.getMessage());
+        }
+    }
+
+    @Override
+    public String toString(Double value) {
+        return value == null ? "dimension" : super.toString(value);
+    }
+
+    @Override
+    public String getRandomDefault() {
+        return "dimension";
+    }
+}

core/src/test/java/art/arcane/iris/core/pack/PackObjectScaleFactorTest.java

@@ -0,0 +1,35 @@
+package art.arcane.iris.core.pack;
+
+import art.arcane.volmlib.util.json.JSONObject;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThrows;
+
+public class PackObjectScaleFactorTest {
+    @Test
+    public void acceptsOmissionAndFiniteFactorsWithinResamplerLimits() {
+        for (String json : List.of("{}", "{\"allObjectScaleFactor\":0.01}",
+                "{\"allObjectScaleFactor\":0.5}", "{\"allObjectScaleFactor\":1}",
+                "{\"allObjectScaleFactor\":2}", "{\"allObjectScaleFactor\":50}")) {
+            List<String> errors = new ArrayList<>();
+            PackDimensionValidator.validateObjectScaleFactor("main", new JSONObject(json), errors);
+            assertEquals(json, List.of(), errors);
+        }
+    }
+
+    @Test
+    public void blocksInvalidTypesAndFactorsInPackAndRuntimeValidation() {
+        for (String value : List.of("null", "true", "\"2\"", "[]", "{}", "0", "-1", "0.009", "50.001")) {
+            JSONObject json = new JSONObject("{\"allObjectScaleFactor\":" + value + "}");
+            List<String> errors = new ArrayList<>();
+            PackDimensionValidator.validateObjectScaleFactor("main", json, errors);
+            assertEquals(value, 1, errors.size());
+            assertThrows(IllegalArgumentException.class,
+                    () -> PackValidator.requireValidObjectSettings(null, "main", json));
+        }
+    }
+}

core/src/test/java/art/arcane/iris/core/project/SchemaBuilderIdentityTest.java

@@ -78,7 +78,7 @@ public class SchemaBuilderIdentityTest {
     @ClassRule
     public static final PlatformLeakGuard PLATFORM_GUARD = PlatformLeakGuard.clean();
 
-    private static final String EXPECTED_SCHEMA_DIGEST = "2f47b30c04bf90a5342df92d7335670679176665520527913f3b90ed0cda65d5";
+    private static final String EXPECTED_SCHEMA_DIGEST = "ddfc51ba19c02dd50737a0d1ba30ee24cdb6cbbe5fed40c875adac69960ad81d";
 
     private static final List<Class<?>> SCHEMA_ROOTS = List.of(
             IrisDimension.class,

core/src/test/java/art/arcane/iris/engine/mantle/components/IrisStructureComponentOverboreTest.java

@@ -7,6 +7,14 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class IrisStructureComponentOverboreTest {
+    @Test
+    public void enlargedTreeSearchCoversPaddedScaleWithoutEnlargingShrunkTrees() {
+        assertEquals(4, IrisStructureComponent.scaledMarkerSpan(4, 1D));
+        assertEquals(4, IrisStructureComponent.scaledMarkerSpan(4, 0.5D));
+        assertEquals(8, IrisStructureComponent.scaledMarkerSpan(4, 2D));
+        assertEquals(20, IrisStructureComponent.scaledMarkerSpan(10, 2D));
+    }
+
     @Test
     public void ordinaryMarkersAreSeparatedFromStructureMarkers() {
         assertTrue(IrisStructureComponent.isOrdinaryObjectMarker("trees/oak@42"));

core/src/test/java/art/arcane/iris/engine/mantle/components/MantleFloatingObjectComponentBoundaryRadiusTest.java

@@ -66,6 +66,7 @@ public class MantleFloatingObjectComponentBoundaryRadiusTest {
                 .setFloatingObjects(new KList<>(placement));
         IrisBiome biome = new IrisBiome().setFloatingChildBiomes(new KList<>(floatingChild));
         IrisDimension dimension = mock(IrisDimension.class);
+        when(dimension.getAllObjectScaleFactor()).thenReturn(1D);
         when(dimension.getReachableBiomes(org.mockito.ArgumentMatchers.any())).thenReturn(new KList<>(biome));
 
         ResourceLoader<IrisObject> objectLoader = mock(ResourceLoader.class);
@@ -80,5 +81,7 @@ public class MantleFloatingObjectComponentBoundaryRadiusTest {
         when(engineMantle.getData()).thenReturn(data);
 
         assertEquals(33, new MantleFloatingObjectComponent(engineMantle).getRadius());
+        when(dimension.getAllObjectScaleFactor()).thenReturn(2D);
+        assertEquals(34, new MantleFloatingObjectComponent(engineMantle).getRadius());
     }
 }

core/src/test/java/art/arcane/iris/engine/mantle/components/MantleObjectComponentBoundaryRadiusTest.java

@@ -96,7 +96,7 @@ public class MantleObjectComponentBoundaryRadiusTest {
                 .setRotation(IrisObjectRotation.of(90, 0, 0))
                 .setTranslate(new IrisObjectTranslate().setX(3).setY(4));
 
-        assertEquals(53, MantleObjectComponent.calculatePlacementReach(new IrisBlockVector(5, 48, 7), placement));
+        assertEquals(53, MantleObjectComponent.calculatePlacementReach(new IrisBlockVector(5, 48, 7), placement, 1D));
     }
 
     @Test
@@ -107,7 +107,7 @@ public class MantleObjectComponentBoundaryRadiusTest {
                 .setMode(ObjectPlaceMode.VACUUM)
                 .setVacuumSettings(new IrisVacuumSettings().setRadius(12));
 
-        assertEquals(43, MantleObjectComponent.calculatePlacementReach(new IrisBlockVector(5, 4, 3), placement));
+        assertEquals(39, MantleObjectComponent.calculatePlacementReach(new IrisBlockVector(5, 4, 3), placement, placement.getMaximumScale(null)));
     }
 
     @Test
@@ -126,6 +126,30 @@ public class MantleObjectComponentBoundaryRadiusTest {
         verify(complex).allowsNewGenerationFootprint(95, 195, 105, 205);
     }
 
+    @Test
+    public void inheritedRadiusMatchesScaledFrameAndExplicitScaleOverridesIt() {
+        IrisDimension dimension = new IrisDimension().setAllObjectScaleFactor(2D);
+        IrisObjectPlacement inherited = new IrisObjectPlacement();
+        IrisBlockVector size = new IrisBlockVector(8, 8, 8);
+        assertEquals(16, MantleObjectComponent.calculatePlacementReach(size, inherited,
+                inherited.getMaximumScale(dimension)));
+        dimension.setAllObjectScaleFactor(0.5D);
+        assertEquals(4, MantleObjectComponent.calculatePlacementReach(size, inherited,
+                inherited.getMaximumScale(dimension)));
+        inherited.setScale(new IrisObjectScale().setSize(1D));
+        assertEquals(8, MantleObjectComponent.calculatePlacementReach(size, inherited,
+                inherited.getMaximumScale(dimension)));
+    }
+
+    @Test
+    public void alreadyScaledObjectFootprintDoesNotApplyScaleTwice() {
+        IrisComplex complex = mock(IrisComplex.class);
+        IrisObject object = new IrisObject(20, 20, 20);
+        IrisObjectPlacement placement = new IrisObjectPlacement().setScale(new IrisObjectScale().setSize(2D));
+        MantleObjectComponent.allowsObjectPlacement(complex, object, placement, 100, 200);
+        verify(complex).allowsNewGenerationFootprint(80, 180, 120, 220);
+    }
+
     @Test
     public void sourceReplayUsesAscendingSignedCoordinates() {
         List<String> replayedSources = new ArrayList<>();
@@ -185,6 +209,7 @@ public class MantleObjectComponentBoundaryRadiusTest {
         when(region.getObjects()).thenReturn(new KList<>());
         when(region.getProceduralObjects()).thenReturn(proceduralObjects);
         IrisDimension dimension = mock(IrisDimension.class);
+        when(dimension.getAllObjectScaleFactor()).thenReturn(1D);
         when(dimension.getAllRegions(any())).thenReturn(new KList<>(region));
         when(dimension.getReachableBiomes(any())).thenReturn(new KList<>());
         Engine engine = mock(Engine.class);
@@ -215,10 +240,12 @@ public class MantleObjectComponentBoundaryRadiusTest {
         when(upperRegion.getObjects()).thenReturn(new KList<>());
         when(upperRegion.getProceduralObjects()).thenReturn(proceduralObjects);
         IrisDimension baseDimension = mock(IrisDimension.class);
+        when(baseDimension.getAllObjectScaleFactor()).thenReturn(1D);
         when(baseDimension.isUpperDimensionObjects()).thenReturn(true);
         when(baseDimension.getAllRegions(any())).thenReturn(new KList<>());
         when(baseDimension.getReachableBiomes(any())).thenReturn(new KList<>());
         IrisDimension upperDimension = mock(IrisDimension.class);
+        when(upperDimension.getAllObjectScaleFactor()).thenReturn(1D);
         when(upperDimension.getAllRegions(any())).thenReturn(new KList<>(upperRegion));
         when(upperDimension.getReachableBiomes(any())).thenReturn(new KList<>());
         UpperDimensionContext upperContext = mock(UpperDimensionContext.class);
@@ -252,6 +279,7 @@ public class MantleObjectComponentBoundaryRadiusTest {
                 .setTranslate(new IrisObjectTranslate().setX(32));
         IrisBiome biome = new IrisBiome().setObjects(new KList<>(placement));
         IrisDimension dimension = mock(IrisDimension.class);
+        when(dimension.getAllObjectScaleFactor()).thenReturn(1D);
         when(dimension.isUseMantle()).thenReturn(true);
         when(dimension.getAllRegions(any())).thenReturn(new KList<>());
         when(dimension.getReachableBiomes(any())).thenReturn(new KList<>(biome));

core/src/test/java/art/arcane/iris/engine/object/IrisObjectGlobalScaleTest.java

@@ -0,0 +1,195 @@
+package art.arcane.iris.engine.object;
+
+import art.arcane.iris.core.loader.IrisData;
+import art.arcane.iris.spi.PlatformBlockState;
+import art.arcane.iris.util.common.math.IrisBlockVector;
+import art.arcane.volmlib.util.math.RNG;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import org.junit.After;
+import org.junit.Test;
+import org.junit.Rule;
+import org.junit.rules.TemporaryFolder;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertThrows;
+import static org.mockito.Mockito.CALLS_REAL_METHODS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class IrisObjectGlobalScaleTest {
+    @Rule
+    public final TemporaryFolder temporaryFolder = new TemporaryFolder();
+    private final Gson gson = new Gson();
+
+    @After
+    public void clearCache() {
+        IrisObjectScale.invalidate(null);
+    }
+
+    @Test
+    public void defaultFactorPreservesObjectAndRandomSequence() {
+        IrisObject origin = new IrisObject(8, 8, 8);
+        IrisObjectPlacement placement = gson.fromJson("{}", IrisObjectPlacement.class);
+        RNG actual = new RNG(731L);
+        RNG expected = new RNG(731L);
+
+        assertNull(placement.getScale());
+        assertSame(origin, placement.scaleObject(actual, origin, new IrisDimension()));
+        assertSame(origin, placement.scaleObject(actual, origin, null));
+        assertEquals(expected.nextLong(), actual.nextLong());
+        assertFalse(gson.toJson(placement).contains("\"scale\""));
+        assertNull(placement.toPlacement("trees/oak").getScale());
+    }
+
+    @Test
+    public void dimensionFactorsUseSeparateCachedVariantsWithoutChangingSourceOrRandomness() {
+        IrisObject origin = new IrisObject(8, 8, 8);
+        IrisObjectPlacement placement = new IrisObjectPlacement();
+        IrisDimension large = new IrisDimension().setAllObjectScaleFactor(2D);
+        IrisDimension small = new IrisDimension().setAllObjectScaleFactor(0.5D);
+        RNG actual = new RNG(731L);
+        RNG expected = new RNG(731L);
+
+        IrisObject doubled = placement.scaleObject(actual, origin, large);
+        IrisObject halved = placement.scaleObject(actual, origin, small);
+
+        assertEquals(16, doubled.getW());
+        assertEquals(4, halved.getW());
+        assertEquals(8, origin.getW());
+        assertNotSame(origin, doubled);
+        assertNotSame(doubled, halved);
+        assertSame(doubled, placement.scaleObject(actual, origin, large));
+        assertSame(halved, placement.scaleObject(actual, origin, small));
+        assertEquals(expected.nextLong(), actual.nextLong());
+    }
+
+    @Test
+    public void globalAndExplicitFactorsScaleOccupiedCubeBoundsExactly() {
+        IrisObject origin = new IrisObject(4, 4, 4);
+        PlatformBlockState stone = mock(PlatformBlockState.class);
+        for (int x = 0; x < 4; x++) {
+            for (int y = 0; y < 4; y++) {
+                for (int z = 0; z < 4; z++) {
+                    origin.setUnsigned(x, y, z, stone);
+                }
+            }
+        }
+        IrisObjectPlacement inherited = new IrisObjectPlacement();
+        IrisDimension doubled = new IrisDimension().setAllObjectScaleFactor(2D);
+        assertOccupiedCube(inherited.scaleObject(new RNG(1), origin, doubled), 8);
+        assertOccupiedCube(inherited.scaleObject(new RNG(1), origin,
+                new IrisDimension().setAllObjectScaleFactor(0.5D)), 2);
+        assertOccupiedCube(new IrisObjectPlacement().setScale(new IrisObjectScale().setSize(0.5D))
+                .scaleObject(new RNG(1), origin, doubled), 2);
+        assertOccupiedCube(new IrisObjectPlacement().setScale(new IrisObjectScale())
+                .scaleObject(new RNG(1), origin, doubled), 4);
+        assertOccupiedCube(origin, 4);
+    }
+
+    @Test
+    public void disabledVariationRangeReportsTheUnscaledFootprint() {
+        IrisObject origin = new IrisObject(4, 4, 4);
+        IrisObjectScale scale = new IrisObjectScale().setMinimumScale(0.25D)
+                .setMaximumScale(0.25D).setVariations(0);
+        assertSame(origin, scale.get(new RNG(1), origin));
+        assertEquals(1D, scale.getMaxScale(), 0D);
+    }
+
+    @Test
+    public void explicitUnitAndEmptyScaleOverrideDimensionFactorAcrossJsonCopies() {
+        IrisObject origin = new IrisObject(8, 8, 8);
+        IrisDimension dimension = new IrisDimension().setAllObjectScaleFactor(2D);
+        for (String json : new String[]{"{\"scale\":{}}", "{\"scale\":{\"size\":1.0}}"}) {
+            IrisObjectPlacement placement = gson.fromJson(json, IrisObjectPlacement.class);
+            IrisObjectPlacement copy = gson.fromJson(gson.toJson(placement.toPlacement("tree")), IrisObjectPlacement.class);
+
+            assertSame(origin, copy.scaleObject(new RNG(1), origin, dimension));
+            assertEquals(1D, copy.getMaximumScale(dimension), 0D);
+        }
+    }
+
+    @Test
+    public void referencedScaleSnippetRemainsAnExplicitOverride() throws Exception {
+        Path root = temporaryFolder.getRoot().toPath();
+        Path snippets = Files.createDirectories(root.resolve("snippet/object-scale"));
+        Files.writeString(snippets.resolve("unit.json"), "{}");
+        Files.writeString(snippets.resolve("half.json"), "{\"size\":0.5}");
+        IrisData data = mock(IrisData.class, CALLS_REAL_METHODS);
+        when(data.getDataFolder()).thenReturn(root.toFile());
+        Gson loaderGson = new GsonBuilder().registerTypeAdapterFactory(data).create();
+        IrisDimension dimension = new IrisDimension().setAllObjectScaleFactor(2D);
+        IrisObject origin = new IrisObject(4, 4, 4);
+        IrisObjectPlacement unit = loaderGson.fromJson(
+                "{\"scale\":\"snippet/object-scale/unit\"}", IrisObjectPlacement.class);
+        IrisObjectPlacement half = loaderGson.fromJson(
+                "{\"scale\":\"snippet/object-scale/half\"}", IrisObjectPlacement.class);
+
+        assertNotNull(unit.getScale());
+        assertSame(origin, unit.scaleObject(new RNG(1), origin, dimension));
+        assertEquals(2, half.scaleObject(new RNG(1), origin, dimension).getW());
+        IrisObjectPlacement copied = loaderGson.fromJson(loaderGson.toJson(half.toPlacement("tree")),
+                IrisObjectPlacement.class);
+        assertEquals(0.5D, copied.getMaximumScale(dimension), 0D);
+    }
+
+    @Test
+    public void explicitRangeKeepsItsExistingSelectionSequenceWithoutMultiplying() {
+        IrisObject origin = new IrisObject(8, 8, 8);
+        IrisObjectScale authored = new IrisObjectScale().setMinimumScale(0.5D)
+                .setMaximumScale(1.5D).setVariations(4);
+        IrisObjectPlacement placement = new IrisObjectPlacement().setScale(authored);
+        IrisDimension dimension = new IrisDimension().setAllObjectScaleFactor(3D);
+        RNG actual = new RNG(1337);
+        RNG expected = new RNG(1337);
+
+        for (int index = 0; index < 12; index++) {
+            assertSame(authored.get(expected, origin), placement.scaleObject(actual, origin, dimension));
+        }
+        assertEquals(1.5D, placement.getMaximumScale(dimension), 0D);
+        assertEquals(expected.nextLong(), actual.nextLong());
+    }
+
+    @Test
+    public void explicitOppositeFactorWinsAndDirectSettersRejectUnsafeValues() {
+        IrisObject origin = new IrisObject(8, 8, 8);
+        IrisObjectPlacement placement = new IrisObjectPlacement().setScale(new IrisObjectScale().setSize(0.5D));
+        assertSame(IrisObjectScale.getFixed(origin, 0.5D), placement.scaleObject(new RNG(1), origin,
+                new IrisDimension().setAllObjectScaleFactor(2D)));
+        for (double invalid : new double[]{Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY,
+                0D, -1D, 0.009D, 50.001D}) {
+            assertThrows(IllegalArgumentException.class, () -> new IrisDimension().setAllObjectScaleFactor(invalid));
+            assertThrows(IllegalArgumentException.class, () -> new IrisObjectScale().setSize(invalid));
+            assertThrows(IllegalArgumentException.class, () -> new IrisStaticObject().setScale(invalid));
+        }
+        assertThrows(IllegalArgumentException.class, () -> gson.fromJson(
+                "{\"allObjectScaleFactor\":0}", IrisDimension.class).getAllObjectScaleFactor());
+    }
+
+    private static void assertOccupiedCube(IrisObject object, int width) {
+        assertEquals(width, object.getW());
+        assertEquals(width, object.getH());
+        assertEquals(width, object.getD());
+        assertEquals(width * width * width, object.getBlocks().size());
+        int minimum = -(width / 2);
+        for (int x = minimum; x < minimum + width; x++) {
+            for (int y = minimum; y < minimum + width; y++) {
+                for (int z = minimum; z < minimum + width; z++) {
+                    assertNotNull(object.getBlocks().get(new IrisBlockVector(x, y, z)));
+                }
+            }
+        }
+        assertEquals(minimum, object.getAABB().min().getX());
+        assertEquals(minimum + width - 1, object.getAABB().max().getX());
+    }
+
+}

core/src/test/java/art/arcane/iris/engine/object/IrisObjectPlacementRunnerRegressionTest.java

@@ -2,12 +2,14 @@ package art.arcane.iris.engine.object;
 
 import art.arcane.iris.core.loader.IrisData;
 import art.arcane.iris.engine.framework.Engine;
+import art.arcane.iris.engine.framework.NativeStructureVolume;
 import art.arcane.iris.engine.framework.PlacedObject;
 import art.arcane.iris.spi.IrisPlatform;
 import art.arcane.iris.spi.IrisPlatforms;
 import art.arcane.iris.spi.PlatformBlockState;
 import art.arcane.iris.spi.PlatformRegistries;
 import art.arcane.iris.testsupport.PlatformLeakGuard;
+import art.arcane.iris.util.project.noise.CNG;
 import art.arcane.volmlib.util.collection.KList;
 import art.arcane.volmlib.util.collection.KMap;
 import art.arcane.volmlib.util.math.RNG;
@@ -37,7 +39,9 @@ import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyDouble;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -279,6 +283,133 @@ public class IrisObjectPlacementRunnerRegressionTest {
         assertEquals(1, object.getStates().size());
     }
 
+    @Test
+    public void paintFollowsTheLowerLedgeBeneathADistantRoof() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        placer.terrain(1, 0, 0, 80, 150, 160);
+        placer.terrain(2, 0, 0, 80, 150, 160);
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT)
+                .setRequireSurfaceSupport(true).setSurfaceSupportBuffer(0);
+
+        assertEquals(80, lineObject(5).place(0, -1, 0, placer, placement, new RNG(2L), data));
+
+        assertEquals(5, placer.writes().size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.y() == 80));
+    }
+
+    @Test
+    public void paintClipsAtACliffWithoutReachingThePatchBeyondIt() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        placer.terrain(1, 0, 0, 20);
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT);
+
+        lineObject(5).place(0, -1, 0, placer, placement, new RNG(2L), data);
+
+        assertEquals(3, placer.writes().size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.x() <= 0 && write.y() == 80));
+    }
+
+    @Test
+    public void paintAccumulatesNormalAscendingAndDescendingSlopeSteps() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        for (int x = -6; x <= 6; x++) {
+            placer.terrain(x, 0, 0, 80 + x * 3);
+        }
+
+        lineObject(13).place(0, -1, 0, placer, placement().setMode(ObjectPlaceMode.PAINT), new RNG(2L), data);
+
+        assertEquals(13, placer.writes().size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.y() == 80 + write.x() * 3));
+    }
+
+    @Test
+    public void paintingAndBoringCannotFeedBackIntoTheSurfaceProjection() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        placer.highestFollowsWrites = true;
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT).setBore(true);
+
+        boxObject(1, 3, 1).place(0, -1, 0, placer, placement, new RNG(2L), data);
+
+        assertEquals(3, placer.writesOf(solid).size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.y() >= 80 && write.y() <= 82));
+    }
+
+    @Test
+    public void paintUsesTranslatedAnchorAndMatchingRandomizedBoreBounds() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        placer.terrain(0, -3, 0, 108);
+        placer.terrain(0, -4, 0, 110);
+        placer.terrain(0, -5, 0, 112);
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT).setBore(true)
+                .setRotation(IrisObjectRotation.of(0, 90, 0))
+                .setTranslate(new IrisObjectTranslate().setX(4).setY(5).setYRandom(3));
+        RNG rng = mock(RNG.class);
+        when(rng.i(0, 3)).thenReturn(3);
+
+        assertEquals(113, lineObject(3).place(0, -1, 0, placer, placement, rng, data));
+
+        assertEquals(3, placer.writesOf(solid).size());
+        assertEquals(3, placer.writesOf(IrisObject.States.air()).size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.x() == 0
+                && write.z() >= -5 && write.z() <= -3 && write.y() == 110 - (write.z() + 4) * 2 + 8));
+    }
+
+    @Test
+    public void nativeVetoUsesTheSelectedLedgeAndRandomTranslationOffset() {
+        RecordingPlacer placer = new RecordingPlacer(engine);
+        placer.terrain(1, 0, 0, 80, 150, 160);
+        when(engine.getMinHeight()).thenReturn(-64);
+        when(engine.getNativeStructureVolumes(anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(
+                new KList<>(NativeStructureVolume.of("test", 1, 21, 0, 1, 21, 0)));
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT).setForcePlace(true)
+                .setTranslate(new IrisObjectTranslate().setY(2).setYRandom(3));
+        RNG rng = mock(RNG.class);
+        when(rng.i(0, 3)).thenReturn(3);
+
+        assertEquals(-1, lineObject(3).place(0, -1, 0, placer, placement, rng, data));
+        assertTrue(placer.writes().isEmpty());
+
+        when(engine.getNativeStructureVolumes(anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(
+                new KList<>(NativeStructureVolume.of("test", 1, 101, 0, 1, 101, 0)));
+        assertEquals(83, lineObject(3).place(0, -1, 0, placer, placement, rng, data));
+        assertTrue(placer.writes().stream().allMatch(write -> write.y() == 85));
+    }
+
+    @Test
+    public void warpedPaintAndNativeVetoUseTheSameFinalColumns() {
+        RecordingPlacer placer = new RecordingPlacer(engine);
+        for (int x = 1; x <= 3; x++) {
+            placer.terrain(x, 2, 0, 80, 150, 160);
+        }
+        IrisObjectPlacement placement = spy(placement().setMode(ObjectPlaceMode.PAINT).setForcePlace(true)
+                .setWarp(new IrisGeneratorStyle(NoiseStyle.SIMPLEX).setMultiplier(4)));
+        CNG warp = mock(CNG.class);
+        when(warp.fitDouble(anyDouble(), anyDouble(), anyDouble(), anyDouble(), anyDouble())).thenReturn(2D);
+        doReturn(warp).when(placement).getSurfaceWarp(any(RNG.class), any());
+        when(engine.getNativeStructureVolumes(anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(
+                new KList<>(NativeStructureVolume.of("test", 3, 80, 2, 3, 80, 2)));
+
+        assertEquals(-1, lineObject(3).place(0, -1, 0, placer, placement, new RNG(2L), data));
+        assertTrue(placer.writes().isEmpty());
+
+        when(engine.getNativeStructureVolumes(anyInt(), anyInt(), anyInt(), anyInt())).thenReturn(NativeStructureVolume.NONE);
+        lineObject(3).place(0, -1, 0, placer, placement, new RNG(2L), data);
+        assertEquals(3, placer.writes().size());
+        assertTrue(placer.writes().stream().allMatch(write -> write.x() >= 1 && write.x() <= 3
+                && write.z() == 2 && write.y() == 80));
+    }
+
+    @Test
+    public void paintSupportChecksTheThicknessOfTheSelectedLowerLedge() {
+        RecordingPlacer placer = new RecordingPlacer(null);
+        placer.terrain(1, 0, 0, 20, 80, 80, 150, 160);
+        IrisObjectPlacement placement = placement().setMode(ObjectPlaceMode.PAINT)
+                .setRequireSurfaceSupport(true).setSurfaceSupportBuffer(0).setSurfaceSupportDepth(2);
+
+        assertEquals(-1, lineObject(3).place(0, -1, 0, placer, placement, new RNG(2L), data));
+        assertTrue(placer.writes().isEmpty());
+    }
+
     private IrisObjectPlacement placement() {
         IrisObjectPlacement placement = new IrisObjectPlacement();
         placement.setMode(ObjectPlaceMode.CENTER_HEIGHT);
@@ -326,9 +457,11 @@ public class IrisObjectPlacementRunnerRegressionTest {
         private final Map<String, PlatformBlockState> world = new HashMap<>();
         private final Map<String, Object> data = new HashMap<>();
         private final List<String> sampledColumns = new ArrayList<>();
+        private final Map<String, int[]> terrain = new HashMap<>();
         private final Engine engine;
         private int failAfterWrites = Integer.MAX_VALUE;
         private boolean debugSmartBore;
+        private boolean highestFollowsWrites;
 
         private RecordingPlacer(Engine engine) {
             this.engine = engine;
@@ -342,6 +475,16 @@ public class IrisObjectPlacementRunnerRegressionTest {
             this.debugSmartBore = debugSmartBore;
         }
 
+        private void terrain(int x, int z, int... spans) {
+            terrain.put(x + ":" + z, spans);
+        }
+
+        private int highest(int x, int z) {
+            int[] spans = terrain.get(x + ":" + z);
+            return (spans == null ? ANCHOR_Y : spans[spans.length - 1])
+                    + (highestFollowsWrites && !writes.isEmpty() ? 1000 : 0);
+        }
+
         private List<BlockWrite> writes() {
             return writes;
         }
@@ -357,13 +500,13 @@ public class IrisObjectPlacementRunnerRegressionTest {
         @Override
         public int getHighest(int x, int z, IrisData data) {
             sampledColumns.add(x + ":" + z);
-            return ANCHOR_Y;
+            return highest(x, z);
         }
 
         @Override
         public int getHighest(int x, int z, IrisData data, boolean ignoreFluid) {
             sampledColumns.add(x + ":" + z);
-            return ANCHOR_Y;
+            return highest(x, z);
         }
 
         @Override
@@ -390,6 +533,20 @@ public class IrisObjectPlacementRunnerRegressionTest {
             return false;
         }
 
+        @Override
+        public boolean isSurfaceSolid(int x, int y, int z) {
+            int[] spans = terrain.get(x + ":" + z);
+            if (spans == null) {
+                return y >= 0 && y <= ANCHOR_Y;
+            }
+            for (int index = 0; index < spans.length; index += 2) {
+                if (y >= spans[index] && y <= spans[index + 1]) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
         @Override
         public boolean isSolid(int x, int y, int z) {
             PlatformBlockState state = get(x, y, z);

core/src/test/java/art/arcane/iris/engine/object/IrisObjectTransformsTileTest.java

@@ -215,6 +215,56 @@ public class IrisObjectTransformsTileTest {
         assertEquals("minecraft:barrel", scaled.getBlocks().get(new IrisBlockVector(4, 0, 0)).materialKey());
     }
 
+    @Test
+    public void fractionalReductionIncludesTheOuterSavedVoxelEdge() {
+        IrisObject source = new IrisObject(4, 1, 1);
+        source.setUnsigned(3, 0, 0, state("minecraft:chest"));
+        source.setUnsignedTile(3, 0, 0, tile("minecraft:chest", "edge"));
+
+        IrisObject scaled = source.scaledAroundOrigin(0.75D, IrisObjectPlacementScaleInterpolator.NONE);
+
+        assertEquals(2, scaled.getBlocks().size());
+        assertEquals("minecraft:chest", scaled.getBlocks().get(new IrisBlockVector(1, 0, 0)).materialKey());
+        assertEquals("edge", scaled.getStates().get(new IrisBlockVector(1, 0, 0)).getProperties().get("name"));
+        assertEquals(1, scaled.getAABB().max().getX());
+    }
+
+    @Test
+    public void fractionalScaleWinnersDoNotDependOnSourceInsertionOrder() {
+        for (boolean savedOrigin : new boolean[]{false, true}) {
+            IrisObject ascending = collisionSource(false);
+            IrisObject descending = collisionSource(true);
+            IrisObject first = savedOrigin
+                    ? ascending.scaledAroundOrigin(0.5D, IrisObjectPlacementScaleInterpolator.NONE)
+                    : ascending.scaled(0.5D, IrisObjectPlacementScaleInterpolator.NONE);
+            IrisObject second = savedOrigin
+                    ? descending.scaledAroundOrigin(0.5D, IrisObjectPlacementScaleInterpolator.NONE)
+                    : descending.scaled(0.5D, IrisObjectPlacementScaleInterpolator.NONE);
+
+            assertEquals(2, first.getBlocks().size());
+            assertEquals(1, first.getStates().size());
+            assertEquals("minecraft:stone", first.getBlocks().get(new IrisBlockVector(-1, 0, 0)).materialKey());
+            assertEquals("winner", first.getStates().get(new IrisBlockVector(0, 0, 0)).getProperties().get("name"));
+            for (Map.Entry<IrisBlockVector, PlatformBlockState> entry : first.getBlocks()) {
+                assertEquals(entry.getValue().materialKey(), second.getBlocks().get(entry.getKey()).materialKey());
+                assertEquals(first.getStates().get(entry.getKey()), second.getStates().get(entry.getKey()));
+            }
+        }
+    }
+
+    private static IrisObject collisionSource(boolean reverse) {
+        IrisObject source = new IrisObject(4, 1, 1);
+        for (int index = 0; index < 4; index++) {
+            int x = reverse ? 3 - index : index;
+            String material = x == 1 ? "minecraft:stone" : "minecraft:chest";
+            source.setUnsigned(x, 0, 0, state(material));
+            if (x != 1) {
+                source.setUnsignedTile(x, 0, 0, tile(material, x == 3 ? "winner" : "overwritten"));
+            }
+        }
+        return source;
+    }
+
     @Test
     public void untypedTilesRemainAttachedToTheirScaledSourceMaterial() {
         IrisObject source = new IrisObject(1, 1, 1);

core/src/test/java/art/arcane/iris/engine/object/IrisPaintSurfaceProjectionTest.java

@@ -0,0 +1,109 @@
+package art.arcane.iris.engine.object;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class IrisPaintSurfaceProjectionTest {
+    @Test
+    public void positiveAndNegativeChunkSeamsHaveIdenticalRelativeSurfaces() {
+        IrisPaintSurfaceProjection positive = projection(15);
+        IrisPaintSurfaceProjection negative = projection(-17);
+        assertNotNull(positive);
+        assertNotNull(negative);
+
+        for (int x = -5; x <= 5; x++) {
+            for (int z = -1; z <= 1; z++) {
+                assertEquals(80 + x * 2, positive.surfaceY(15 + x, z));
+                assertEquals(positive.surfaceY(15 + x, z), negative.surfaceY(-17 + x, z));
+            }
+        }
+    }
+
+    @Test
+    public void exposedFloorsMustExistAtTheRequestedAnchor() {
+        IObjectPlacer placer = mock(IObjectPlacer.class);
+        when(placer.getHighest(anyInt(), anyInt(), any(), anyBoolean())).thenReturn(140);
+        when(placer.isSurfaceSolid(anyInt(), anyInt(), anyInt())).thenAnswer(invocation -> {
+            int y = invocation.getArgument(1);
+            return y >= 0 && y <= 100;
+        });
+
+        assertNull(IrisPaintSurfaceProjection.create(placer, request(80, false)));
+        assertNotNull(IrisPaintSurfaceProjection.create(placer, request(100, false)));
+        assertNull(IrisPaintSurfaceProjection.create(placer, request(140, false)));
+    }
+
+    @Test
+    public void aVirtualHeightmapDoesNotFallBackToPhysicalLedges() {
+        IObjectPlacer placer = mock(IObjectPlacer.class);
+        when(placer.getHighest(anyInt(), anyInt(), any(), anyBoolean()))
+                .thenAnswer(invocation -> (int) invocation.getArgument(0) == 0 ? 80 : 140);
+        when(placer.isSurfaceSolid(anyInt(), anyInt(), anyInt()))
+                .thenAnswer(invocation -> (int) invocation.getArgument(1) <= 80);
+        IrisPaintSurfaceProjection projection = IrisPaintSurfaceProjection.create(placer, request(80, true));
+
+        assertNotNull(projection);
+        assertEquals(80, projection.surfaceY(0, 0));
+        assertEquals(IrisPaintSurfaceProjection.MISSING, projection.surfaceY(1, 0));
+    }
+
+    @Test
+    public void surfaceChoicesStayCompatibleWhenTwoTraversalBranchesMeet() {
+        IObjectPlacer placer = mock(IObjectPlacer.class);
+        when(placer.getHighest(anyInt(), anyInt(), any(), anyBoolean())).thenAnswer(invocation -> {
+            int x = invocation.getArgument(0);
+            int z = invocation.getArgument(1);
+            return 80 + x * z;
+        });
+        when(placer.isSurfaceSolid(anyInt(), anyInt(), anyInt())).thenAnswer(invocation -> {
+            int x = invocation.getArgument(0);
+            int y = invocation.getArgument(1);
+            int z = invocation.getArgument(2);
+            return y <= 80 + x * z;
+        });
+        IrisPaintSurfaceProjection projection = IrisPaintSurfaceProjection.create(placer,
+                new IrisPaintSurfaceProjection.Request(null, -6, 6, -6, 6, 0, 80, 0, true, false));
+        assertNotNull(projection);
+
+        for (int x = -6; x < 6; x++) {
+            for (int z = -6; z < 6; z++) {
+                int surface = projection.surfaceY(x, z);
+                if (surface == IrisPaintSurfaceProjection.MISSING) {
+                    continue;
+                }
+                int east = projection.surfaceY(x + 1, z);
+                int south = projection.surfaceY(x, z + 1);
+                assertTrue(east == IrisPaintSurfaceProjection.MISSING || Math.abs(surface - east) <= 4);
+                assertTrue(south == IrisPaintSurfaceProjection.MISSING || Math.abs(surface - south) <= 4);
+            }
+        }
+    }
+
+    private IrisPaintSurfaceProjection projection(int anchorX) {
+        IObjectPlacer placer = mock(IObjectPlacer.class);
+        when(placer.getHighest(anyInt(), anyInt(), any(), anyBoolean())).thenAnswer(invocation -> {
+            int x = invocation.getArgument(0);
+            return x > anchorX ? 200 : 80 + (x - anchorX) * 2;
+        });
+        when(placer.isSurfaceSolid(anyInt(), anyInt(), anyInt())).thenAnswer(invocation -> {
+            int x = invocation.getArgument(0);
+            int y = invocation.getArgument(1);
+            return y <= 80 + (x - anchorX) * 2 || x > anchorX && y >= 190 && y <= 200;
+        });
+        return IrisPaintSurfaceProjection.create(placer, new IrisPaintSurfaceProjection.Request(null,
+                anchorX - 5, anchorX + 5, -1, 1, anchorX, 80, 0, true, false));
+    }
+
+    private IrisPaintSurfaceProjection.Request request(int anchorY, boolean virtual) {
+        return new IrisPaintSurfaceProjection.Request(null, 0, 1, 0, 0, 0, anchorY, 0, true, virtual);
+    }
+}

core/src/test/java/art/arcane/iris/engine/object/IrisStaticObjectLayerTest.java

@@ -81,6 +81,41 @@ public class IrisStaticObjectLayerTest {
         verifyNoInteractions(engine, loader);
     }
 
+    @Test
+    public void globalScalingKeepsSavedOriginsAndExplicitEntrySizes() {
+        IrisObject cube = object("cube", 4, 4, 4);
+        for (int x = -2; x < 2; x++) {
+            for (int y = -2; y < 2; y++) {
+                for (int z = -2; z < 2; z++) {
+                    cube.getBlocks().put(new IrisBlockVector(x, y, z), state("minecraft:stone"));
+                }
+            }
+        }
+        for (double factor : new double[]{2D, 0.5D}) {
+            IrisDimension dimension = new IrisDimension().setAllObjectScaleFactor(factor)
+                    .setStaticObjects(new KList<>(entry("cube", 16, 100, 16),
+                            entry("cube", 48, 100, 16).setScale(1D),
+                            entry("cube", 80, 100, 16).setScale(1D / factor)));
+            IrisStaticObjectLayer layer = dimension.getStaticObjectLayer(data);
+            int[] counts = new int[3];
+            for (int chunkX = 0; chunkX < 6; chunkX++) {
+                for (int chunkZ = 0; chunkZ < 2; chunkZ++) {
+                    counts[chunkX / 2] += layer.blocks(chunkX, chunkZ).size();
+                }
+            }
+            assertEquals(factor == 2D ? 512 : 8, counts[0]);
+            assertEquals(64, counts[1]);
+            assertEquals(factor == 2D ? 8 : 512, counts[2]);
+            int halfWidth = factor == 2D ? 4 : 1;
+            assertTrue(layer.contains(16 - halfWidth, 164 - halfWidth, 16 - halfWidth));
+            assertFalse(layer.contains(15 - halfWidth, 164 - halfWidth, 16 - halfWidth));
+            dimension.setAllObjectScaleFactor(1D);
+            assertNotSame(layer, dimension.getStaticObjectLayer(data));
+        }
+        assertEquals(64, cube.getBlocks().size());
+        assertEquals(4, cube.getW());
+    }
+
     @Test
     public void rotatedNegativeCoordinatesAndMinusOneYUseExactWorldOrigin() {
         IrisObject object = object("cross", 5, 3, 5);

core/src/test/java/art/arcane/iris/engine/object/IrisStaticObjectTest.java

@@ -9,6 +9,7 @@ import java.util.List;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
@@ -23,7 +24,7 @@ public class IrisStaticObjectTest {
         assertEquals(ObjectPlaceMode.STRUCTURE_PIECE, placement.getMode());
         assertTrue(placement.isForcePlace());
         assertFalse(placement.getRotation().isEnabled());
-        assertFalse(placement.getScale().shouldScale());
+        assertNull(placement.getScale());
         assertEquals(new IrisPosition(100, 100, -100), object.getPosition());
     }
 
@@ -69,8 +70,8 @@ public class IrisStaticObjectTest {
         assertThrows(IllegalArgumentException.class, () -> new IrisStaticObject().validate(-64, 320));
         assertThrows(IllegalArgumentException.class, () -> validObject().setPosition(null).validate(-64, 320));
         assertThrows(IllegalArgumentException.class, () -> validObject().setScale(Double.NaN).validate(-64, 320));
-        assertThrows(IllegalArgumentException.class, () -> validObject().setScale(0).validate(-64, 320));
+        assertThrows(IllegalArgumentException.class, () -> validObject().setScale(0D).validate(-64, 320));
-        assertThrows(IllegalArgumentException.class, () -> validObject().setScale(51).validate(-64, 320));
+        assertThrows(IllegalArgumentException.class, () -> validObject().setScale(51D).validate(-64, 320));
         assertThrows(IllegalArgumentException.class, () -> validObject().setRotation(null).validate(-64, 320));
         assertThrows(IllegalArgumentException.class,
                 () -> validObject().setRotation(new IrisStaticObjectRotation().setY(-361)).validate(-64, 320));

core/src/test/java/art/arcane/iris/util/common/director/specialhandlers/ObjectScaleHandlerTest.java

@@ -0,0 +1,29 @@
+package art.arcane.iris.util.common.director.specialhandlers;
+
+import art.arcane.volmlib.util.director.exceptions.DirectorParsingException;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThrows;
+
+public class ObjectScaleHandlerTest {
+    @Test
+    public void distinguishesInheritedScaleFromExplicitOne() throws Exception {
+        ObjectScaleHandler handler = new ObjectScaleHandler();
+        assertNull(handler.parse("dimension", true));
+        assertNull(handler.parse(" DIMENSION ", false));
+        assertEquals(1D, handler.parse("1.0", false), 0D);
+        assertEquals(0.5D, handler.parse("0.5", false), 0D);
+        assertEquals(2D, handler.parse("2", false), 0D);
+        assertEquals("dimension", handler.toString(null));
+    }
+
+    @Test
+    public void rejectsInvalidManualFactors() {
+        ObjectScaleHandler handler = new ObjectScaleHandler();
+        for (String invalid : new String[]{"NaN", "Infinity", "-Infinity", "0", "-1", "0.009", "50.001"}) {
+            assertThrows(invalid, DirectorParsingException.class, () -> handler.parse(invalid, false));
+        }
+    }
+}