Updated builds.

build/three.js

@@ -18659,6 +18659,8 @@ THREE.ShaderChunk = {
 
 		"	mat4 skinMatrix = skinWeight.x * boneMatX;",
 		"	skinMatrix 	+= skinWeight.y * boneMatY;",
+		"	skinMatrix 	+= skinWeight.z * boneMatZ;",
+		"	skinMatrix 	+= skinWeight.w * boneMatW;",
 
 		"	#ifdef USE_MORPHNORMALS",
 
@@ -19012,6 +19014,7 @@ THREE.ShaderChunk = {
 
 
 };
+
 /**
  * Uniform Utilities
  */