1 files changed, 14 insertions, 7 deletions

diff --git a/js/lib/drawing/world.js b/js/lib/drawing/world.js
index 8068284e..39f97134 100755
--- a/js/lib/drawing/world.js
+++ b/js/lib/drawing/world.js
@@ -442,6 +442,7 @@ World.prototype.updateObject = function (obj) {
         if (prims.length != materialNodes.length)
                 throw new Error("inconsistent material and primitive counts");
         var nPrims = prims.length;
+        var iPrim = 0;
         var ctrTrNode;
         if (nPrims > 0)
         {
@@ -459,8 +460,12 @@ World.prototype.updateObject = function (obj) {
                 );
                 ctrTrNode.meshes = [];
 
-                ctrTrNode.attachMeshNode(this.renderer.id + "_prim_" + this._nodeCounter++, prims[0]);
                 ctrTrNode.attachMaterial(materialNodes[0]);
+                while ((iPrim < nPrims) && (materialNodes[iPrim] == materialNodes[0]))
+                {
+                        ctrTrNode.attachMeshNode(this.renderer.id + "_prim_" + this._nodeCounter++, prims[iPrim]);
+                        iPrim++;
+                }
         }
         
         // delete all of the child nodes
@@ -481,16 +486,18 @@ World.prototype.updateObject = function (obj) {
         }
         ctrTrNode.children = [];
 
-        for (var i = 1; i < nPrims; i++)
+        while (iPrim < nPrims)
         {
-                // get the next primitive
                 childTrNode = RDGE.createTransformNode("objNode_" + this._nodeCounter++);
                 ctrTrNode.insertAsChild(childTrNode);
+                var matNode = materialNodes[iPrim];
+                childTrNode.attachMaterial(matNode);
 
-                // attach the instanced box goe
-                var prim = prims[i];
-                childTrNode.attachMeshNode(this.renderer.id + "_prim_" + this._nodeCounter++, prim);
-                childTrNode.attachMaterial(materialNodes[i]);
+                while ((iPrim < nPrims) && (materialNodes[iPrim] == matNode))
+                {
+                        childTrNode.attachMeshNode(this.renderer.id + "_prim_" + this._nodeCounter++, prims[iPrim]);
+                        iPrim++;
+                }
         }
 
         // send a notification that the tree has changed