Fixed shadows getting animated when skinning / morphing was disabled for the regular rendering.

Fixes mrdoob#2489

Doesn't deal yet properly with MeshFaceMaterial and having mesh chunks with different animation statuses.

Author: alteredq

build/three.js

@@ -250,6 +250,8 @@ THREE.ShadowMapPlugin = function ( ) {
 
 			// render regular objects
 
+			var objectMaterial, useMorphing, useSkinning;
+
 			for ( j = 0, jl = renderList.length; j < jl; j ++ ) {
 
 				webglObject = renderList[ j ];
@@ -262,15 +264,26 @@ THREE.ShadowMapPlugin = function ( ) {
 					// culling is overriden globally for all objects
 					// while rendering depth map
 
+					// need to deal with MeshFaceMaterial somehow
+					// in that case just use the first of geometry.materials for now
+					// (proper solution would require to break objects by materials
+					//  similarly to regular rendering and then set corresponding
+					//  depth materials per each chunk instead of just once per object)
+
+					objectMaterial = getObjectMaterial( object );
+
+					useMorphing = object.geometry.morphTargets.length > 0 && objectMaterial.morphTargets;
+					useSkinning = object instanceof THREE.SkinnedMesh && objectMaterial.skinning;
+
 					if ( object.customDepthMaterial ) {
 
 						material = object.customDepthMaterial;
 
-					} else if ( object instanceof THREE.SkinnedMesh ) {
+					} else if ( useSkinning ) {
 
-						material = object.geometry.morphTargets.length ? _depthMaterialMorphSkin : _depthMaterialSkin;
+						material = useMorphing ? _depthMaterialMorphSkin : _depthMaterialSkin;
 
-					} else if ( object.geometry.morphTargets.length ) {
+					} else if ( useMorphing ) {
 
 						material = _depthMaterialMorph;
 
@@ -462,6 +475,15 @@ THREE.ShadowMapPlugin = function ( ) {
 
 	}
 
+	// For the moment just ignore objects that have multiple materials with different animation methods
+	// Only the first material will be taken into account for deciding which depth material to use for shadow maps
+
+	function getObjectMaterial( object ) {
+
+		return object.material instanceof THREE.MeshFaceMaterial ? object.geometry.materials[ 0 ] : object.material;
+
+	}
+
 };
 
 THREE.ShadowMapPlugin.__projector = new THREE.Projector();