Various performance tweaks: cull nodes with no mesh children, allow

locking the transforms and bounds of models whose positions will not 
change, skip/postpone updates for models that aren't in view.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4078 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/jme/model/ModelMesh.java

@@ -186,8 +186,10 @@ public class ModelMesh extends TriMesh
     @Override // documentation inherited
     public Spatial putClone (Spatial store, CloneCreator properties)
     {
-        ModelMesh mstore;
-        if (store == null) {
+        ModelMesh mstore = (ModelMesh)properties.originalToCopy.get(this);
+        if (mstore != null) {
+            return mstore;
+        } else if (store == null) {
             mstore = new ModelMesh(getName());
         } else {
             mstore = (ModelMesh)store;
@@ -213,6 +215,14 @@ public class ModelMesh extends TriMesh
         return mstore;
     }
     
+    @Override // documentation inherited
+    public void updateWorldVectors ()
+    {
+        if (!_transformLocked) {
+            super.updateWorldVectors();
+        }
+    }
+    
     // documentation inherited from interface Externalizable
     public void writeExternal (ObjectOutput out)
         throws IOException
@@ -401,6 +411,16 @@ public class ModelMesh extends TriMesh
         reconstruct(vbbuf, nbbuf, cbbuf, tbbuf, ibbuf);
     }
     
+    /**
+     * Locks the transform and bounds of this mesh on the assumption that its
+     * position will not change.
+     */
+    protected void lockInstance ()
+    {
+        lockBounds();
+        _transformLocked = true;
+    }
+    
     /**
      * Imposes the specified order on the given buffer of 32 bit values.
      */
@@ -455,6 +475,11 @@ public class ModelMesh extends TriMesh
     /** For prototype meshes, the resolved texture states. */
     protected TextureState[] _tstates;
     
+    /** Whether or not the transform has been locked.  This operates in a
+     * slightly different way than JME's locking, in that it allows applying
+     * transformations to display lists. */
+    protected boolean _transformLocked;
+    
     /** The shared state for back face culling. */
     protected static CullState _backCull;