Skeletal Animation: remove shared mesh support

 - shared meshes in J3O / OgreXML are automatically de-shared on import, so this functionality is no longer used in the engine

jme3-core/src/main/java/com/jme3/animation/SkeletonControl.java

@@ -206,43 +206,18 @@ public class SkeletonControl extends AbstractControl implements Cloneable {
     }
 
     private void findTargets(Node node) {
-        Mesh sharedMesh = null;        
-
         for (Spatial child : node.getChildren()) {
             if (child instanceof Geometry) {
                 Geometry geom = (Geometry) child;
-
-                // is this geometry using a shared mesh?
-                Mesh childSharedMesh = geom.getUserData(UserData.JME_SHAREDMESH);
-
-                if (childSharedMesh != null) {
-                    // Don’t bother with non-animated shared meshes
-                    if (childSharedMesh.isAnimated()) {
-                        // child is using shared mesh,
-                        // so animate the shared mesh but ignore child
-                        if (sharedMesh == null) {
-                            sharedMesh = childSharedMesh;
-                        } else if (sharedMesh != childSharedMesh) {
-                            throw new IllegalStateException("Two conflicting shared meshes for " + node);
-                        }
-                        materials.add(geom.getMaterial());
-                    }
-                } else {
-                    Mesh mesh = geom.getMesh();
-                    if (mesh.isAnimated()) {
-                        targets.add(mesh);
-                        materials.add(geom.getMaterial());
-                    }
+                Mesh mesh = geom.getMesh();
+                if (mesh.isAnimated()) {
+                    targets.add(mesh);
+                    materials.add(geom.getMaterial());
                 }
             } else if (child instanceof Node) {
                 findTargets((Node) child);
             }
         }
-
-        if (sharedMesh != null) {
-            targets.add(sharedMesh);
-        }
-
     }
 
     @Override
@@ -263,7 +238,7 @@ public class SkeletonControl extends AbstractControl implements Cloneable {
             softwareSkinUpdate(mesh, offsetMatrices);
         }     
     }
-
+    
     private void controlRenderHardware() {
         offsetMatrices = skeleton.computeSkinningMatrices();
         for (Material m : materials) {

jme3-core/src/main/java/com/jme3/scene/Geometry.java

@@ -580,6 +580,7 @@ public class Geometry extends Spatial {
             Mesh sharedMesh = getUserData(UserData.JME_SHAREDMESH);
             if (sharedMesh != null) {
                 getMesh().extractVertexData(sharedMesh);
+                setUserData(UserData.JME_SHAREDMESH, null);
             }
         }
     }