Fix Hullhider.

FightSystem/FightSystem_Core/src/de/steamwar/fightsystem/utils/Hull.java

@@ -47,6 +47,7 @@ public class Hull {
     private final Region region;
     private final boolean groundVisible;
     private final IntVector primaryDirection;
+    private final IntVector[] directions;
     private final IntVector[] branchDirections;
 
     private final BitSet occluding;
@@ -65,10 +66,14 @@ public class Hull {
         this.occluding = new BitSet(region.volume());
         this.visibility = new BitSet(region.volume());
 
-        branchDirections = IntStream.range(0, 27)
+        directions = IntStream.range(0, 27)
                 .mapToObj(v -> new IntVector(v%3 -1, (v/3)%3 -1, v/9 -1))
+                .filter(v -> v.sqLength() > 0)
+                .filter(v -> v.sqLength() <= 2)
+                .toArray(IntVector[]::new);
+        branchDirections = Arrays.stream(directions)
                 .filter(v -> v.x*primaryDirection.x + v.y*primaryDirection.y + v.z*primaryDirection.z >= 0) // Not pointing away from primary direction
-                .filter(v -> v.x*v.x + v.y*v.y + v.z*v.z == 2) // Diagonal
+                .filter(v -> v.sqLength() == 2) // Diagonal
                 .toArray(IntVector[]::new);
     }
 
@@ -162,9 +167,9 @@ public class Hull {
             return;
 
         List<IntVector> uncovered = new ArrayList<>();
-        int directions = visibilityDirections.remove(id);
-        for(IntVector direction : branchDirections) {
-            if((directionId(direction) & directions) != 0)
+        int visibleDirections = visibilityDirections.remove(id);
+        for(IntVector direction : directions) {
+            if((directionId(direction) & visibleDirections) != 0)
                 updateBlocks(uncovered, root, direction);
         }
 
@@ -293,6 +298,10 @@ public class Hull {
             return add(v.x, v.y, v.z);
         }
 
+        public int sqLength() {
+            return x*x + y*y + z*z;
+        }
+
         @Override
         public int hashCode() {
             return y << 24 ^ x << 12 ^ z;