Fixed issue https://github.com/jMonkeyEngine/jmonkeyengine/issues/252

This was due to a bug in the code where triangle data were stored after calculation.

jme3-core/src/main/java/com/jme3/util/TangentBinormalGenerator.java

@@ -612,9 +612,9 @@ public class TangentBinormalGenerator {
             normal.normalizeLocal();
             
             return new TriangleData(
-                    tangent,
+                    tangent.clone(),
-                    binormal,
+                    binormal.clone(),
-                    normal);
+                    normal.clone());
         } finally {
             tmp.release();
         }