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Strange behavior with CSG.


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I am getting unexpected results when I work with CSG.

I am trying to do the below stuff with my model which is a flat/apartment.

1. In my model, merge all the meshes which are floors. Get a CSG.

2. foreach other mesh, if it is below 1.6 meters from any floor,

    2.1 find out its position if it is placed on the floor.

    2.2 Subtract this area from the above CSG      


Now the CSG will have holes. I use this CSG to create a navigation mesh so that if there is a hole, it means we cannot navigate there.


The same stuff is implemented in a sample. It is working fine. https://www.babylonjs-playground.com/#QSS0FZ#6


When I try this with real model, I am getting strange results. https://www.babylonjs-playground.com/#QSS0FZ#13

All the holes are kept one side only. The core logic in both the scenarios is exactly same. No idea why it is not coming properly


I have been struggling on this for more than 8 days. Can you please help me 


Thanks in advance


@trevordev, @brianzinn, @Sebavan Please help me.







not working.png

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