Fix wrong value for LookAt

hrt/prefab/fx/LookAt.hx

@@ -28,6 +28,7 @@ class LookAtObject extends h3d.scene.Object {
 		else {
 			if(getScene() == null || getScene().camera == null) return;
 			lookAtPos.load(getScene().camera.pos);
+			lookAtPos.w = 1;
 		}
 
 		super.calcAbsPos();