Add hack for oblique projection

index.js

@@ -1015,7 +1015,7 @@ export function Projector () {
         var normal = node.getNormal();
         var point = node.getPointOnPlane();
         
-        var viewer = _camera.position;
+        var viewer = _camera._fakePosition || _camera.position;
         var viewerSign = BSPTree.utils.getPointSign(normal, viewer, point);
         var thisSign = this.getSign(normal, point);