Add default values in Vector3#setVector

Author: davidpiegza

utils/Vector3.js

@@ -28,9 +28,9 @@ Object.assign(Vector3.prototype, {
   },
 
   setVector: function(v) {
-    this.x = v.x;
-    this.y = v.y;
-    this.z = v.z;
+    this.x = v.x || 0;
+    this.y = v.y || 0;
+    this.z = v.z || 0;
 
     return this;
   },