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indeterministic rendering of a model

Baker Xiao

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We noticed something weird when loading a model into the scene. See https://www.babylonjs-playground.com/#EBEEZ9 for a repro. We can consistently repro with Chrome on Mac. 

If you just run the scene multiple times without changing anything, you will see two possible outcome:

1. Stick pointing down, and rendering is correct

2. Stick pointing up, and all the triangles seem to become backfaces and are being culled. It's as if the whole model got inverted. 

Any idea what it might be?

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