Skinned model fix

CHANGES.md

@@ -32,6 +32,7 @@ Change Log
 * Added 'Video' Sandcastle showcase to demonstrate video materials.
 * Added `createOpenStreetMapImageryProvider` function to replace the `OpenStreetMapImageryProvider` class. This function returns a constructed `UrlTemplateImageryProvider`.
 * Fixed an issue with tile selection when below the surface of the ellipsoid. [#3170](https://github.com/AnalyticalGraphicsInc/cesium/issues/3170)
+* Fixed an issue with loading skeletons for skinned glTF models. [#3224](https://github.com/AnalyticalGraphicsInc/cesium/pull/3224)
 
 ### 1.15 - 2015-11-02
 

Source/Scene/Model.js

@@ -1712,16 +1712,17 @@ define([
         return attributeLocations;
     }
 
-    function searchForest(forest, jointName) {
+    function searchForest(forest, jointName, nodes) {
         var length = forest.length;
         for (var i = 0; i < length; ++i) {
             var stack = [forest[i]]; // Push root node of tree
 
             while (stack.length > 0) {
-                var n = stack.pop();
+                var id = stack.pop();
+                var n = nodes[id];
 
                 if (n.jointName === jointName) {
-                    return n;
+                    return id;
                 }
 
                 var children = n.children;
@@ -1755,19 +1756,20 @@ define([
 
             // 1. Find nodes with the names in node.skeletons (the node's skeletons)
             // 2. These nodes form the root nodes of the forest to search for each joint in skin.jointNames.  This search uses jointName, not the node's name.
-
+            // 3. Search for the joint name among the gltf node hierarchy instead of the runtime node hierarchy. Child links aren't set up yet for runtime nodes.
             var forest = [];
             var gltfSkeletons = node.skeletons;
             var skeletonsLength = gltfSkeletons.length;
             for (var k = 0; k < skeletonsLength; ++k) {
-                forest.push(runtimeNodes[gltfSkeletons[k]]);
+                forest.push(gltfSkeletons[k]);
             }
 
             var gltfJointNames = skins[node.skin].jointNames;
             var jointNamesLength = gltfJointNames.length;
             for (var i = 0; i < jointNamesLength; ++i) {
                 var jointName = gltfJointNames[i];
-                skinnedNode.joints.push(searchForest(forest, jointName));
+                var jointNode = runtimeNodes[searchForest(forest, jointName, nodes)];
+                skinnedNode.joints.push(jointNode);
             }
         }
     }