Merge pull request #4341 from HeercoGrond/patch-2

Added Shadows to ModelInstanceCollection

Source/Scene/ModelInstanceCollection.js

@@ -70,6 +70,7 @@ define([
      * @param {Boolean} [options.show=true] Determines if the collection will be shown.
      * @param {Boolean} [options.allowPicking=false] When <code>true</code>, each glTF mesh and primitive is pickable with {@link Scene#pick}.
      * @param {Boolean} [options.asynchronous=true] Determines if model WebGL resource creation will be spread out over several frames or block until completion once all glTF files are loaded.
+     * @param {ShadowMode} [options.shadows=ShadowMode.ENABLED] Determines whether the collection casts or receives shadows from each light source.
      * @param {Boolean} [options.debugShowBoundingVolume=false] For debugging only. Draws the bounding sphere for the collection.
      * @param {Boolean} [options.debugWireframe=false] For debugging only. Draws the instances in wireframe.
      *
@@ -131,6 +132,7 @@ define([
         this._gltf = options.gltf;
         this._basePath = options.basePath;
         this._asynchronous = options.asynchronous;
+        this._shadows = options.shadows;
 
         this.debugShowBoundingVolume = defaultValue(options.debugShowBoundingVolume, false);
         this._debugShowBoundingVolume = false;
@@ -491,6 +493,7 @@ define([
             requestType : collection._requestType,
             gltf : collection._gltf,
             basePath : collection._basePath,
+            shadows : collection._shadows,
             cacheKey : undefined,
             asynchronous : collection._asynchronous,
             allowPicking : collection._allowPicking,