Fix divide by 0 in shadow utils for some scenes #2209 (#2210)

jMonkeyEngine · Mar 2, 2024 · e584cb1 · e584cb1
1 parent 965a813
commit e584cb1
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/jme3-core/src/main/java/com/jme3/shadow/ShadowUtil.java b/jme3-core/src/main/java/com/jme3/shadow/ShadowUtil.java
@@ -569,8 +569,10 @@ public static void updateShadowCamera(ViewPort viewPort,
  float scaleX, scaleY, scaleZ;
  float offsetX, offsetY, offsetZ;
 
- scaleX = (2.0f) / (cropMax.x - cropMin.x);
- scaleY = (2.0f) / (cropMax.y - cropMin.y);
+ float deltaCropX = cropMax.x - cropMin.x;
+ float deltaCropY = cropMax.y - cropMin.y;
+ scaleX = deltaCropX == 0 ? 0 : 2.0f / deltaCropX;
+ scaleY = deltaCropY == 0 ? 0 : 2.0f / deltaCropY;
 
  //Shadow map stabilization approximation from shaderX 7
  //from Practical Cascaded Shadow maps adapted to PSSM
@@ -595,7 +597,8 @@ public static void updateShadowCamera(ViewPort viewPort,
  offsetY = FastMath.ceil(offsetY * halfTextureSize) / halfTextureSize;
  }
 
- scaleZ = 1.0f / (cropMax.z - cropMin.z);
+ float deltaCropZ = cropMax.z - cropMin.z;
+ scaleZ = deltaCropZ == 0 ? 0 : 1.0f / deltaCropZ;
  offsetZ = -cropMin.z * scaleZ;