Fixed featurette edge cases

- Fan coral tips follow the existing top of each occupied column
- Large secondary leaf weights preserve their authored proportions
- Zero ore thresholds skip noise sampling and block generation
- Regressions cover fan silhouettes, weighted leaf choices, and ore cutoffs

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

@@ -58,7 +58,7 @@ public class IrisOreGenerator {
     }
 
     public PlatformBlockState generate(int x, int y, int z, RNG rng, IrisData data) {
-        if (!range.contains(y)) {
+        if (threshold <= 0 || !range.contains(y)) {
             return null;
         }
 

core/src/main/java/art/arcane/iris/engine/object/coral/CoralGenerator.java

@@ -88,16 +88,18 @@ public final class CoralGenerator {
 
     private static void buildFan(CoralCanvas canvas, IrisCoral coral, int height, long seed) {
         int half = Math.max(1, coral.getFanWidth());
-        for (int y = 0; y < height; y++) {
+        int tippedWidth = -1;
+        for (int y = height - 1; y >= 0; y--) {
             double t = y / (double) Math.max(1, height - 1);
             double profile = Math.sin(Math.PI * t);
             int w = (int) Math.round(half * profile);
             for (int dx = -w; dx <= w; dx++) {
                 canvas.set(dx, y, 0, CoralCanvas.Role.STRUCTURE);
+                if (Math.abs(dx) > tippedWidth) {
+                    placeTip(canvas, coral, dx, y, 0, seed + dx);
+                }
             }
-        }
-        for (int dx = -half; dx <= half; dx++) {
-            placeTip(canvas, coral, dx, height - 1, 0, seed + dx);
+            tippedWidth = Math.max(tippedWidth, w);
         }
     }
 

core/src/main/java/art/arcane/iris/engine/object/tree/TreeBlockResolver.java

@@ -23,6 +23,7 @@ import art.arcane.iris.engine.object.IrisMaterialPalette;
 import art.arcane.iris.engine.object.IrisProceduralBlocks;
 import art.arcane.iris.engine.object.IrisProceduralTree;
 import art.arcane.iris.engine.object.IrisTreeDecorator;
+import art.arcane.iris.engine.object.IrisTreeSecondaryLeaf;
 import art.arcane.iris.spi.PlatformBlockState;
 import art.arcane.iris.util.common.data.B;
 import art.arcane.volmlib.util.math.RNG;
@@ -106,16 +107,16 @@ public final class TreeBlockResolver {
     }
 
     private static String pickWeighted(IrisProceduralTree tree, RNG rng) {
-        int total = 0;
-        for (art.arcane.iris.engine.object.IrisTreeSecondaryLeaf s : tree.getWeightedSecondaryLeaves()) {
+        long total = 0;
+        for (IrisTreeSecondaryLeaf s : tree.getWeightedSecondaryLeaves()) {
             total += Math.max(0, s.getWeight());
         }
         if (total <= 0) {
             return null;
         }
         double r = rng.nextDouble() * total;
-        double cumulative = 0;
-        for (art.arcane.iris.engine.object.IrisTreeSecondaryLeaf s : tree.getWeightedSecondaryLeaves()) {
+        long cumulative = 0;
+        for (IrisTreeSecondaryLeaf s : tree.getWeightedSecondaryLeaves()) {
             cumulative += Math.max(0, s.getWeight());
             if (r < cumulative) {
                 return s.getBlock();