commit 45b73b1a2887bca0cedc490206f3a13d31a7cff1
Author: leszek <leszek@koltunski.pl>
Date:   Wed Jul 12 12:25:39 2023 +0200

    Bugfix in MeshMultigon.

diff --git a/src/main/java/org/distorted/library/mesh/MeshMultigon.java b/src/main/java/org/distorted/library/mesh/MeshMultigon.java
index ad883fc..25f4d0e 100644
--- a/src/main/java/org/distorted/library/mesh/MeshMultigon.java
+++ b/src/main/java/org/distorted/library/mesh/MeshMultigon.java
@@ -314,6 +314,11 @@ public class MeshMultigon extends MeshBase
 
       if( vup )
         {
+        normL[0]=0;
+        normL[1]=1;
+        normR[0]=0;
+        normR[1]=1;
+
         return MeshBandedTriangle.MODE_FLAT;
         }
       else