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Question by AAcat · Oct 06, 2019 at 04:27 PM · physicserror message

Getting [Physics.PhysX] Warning message

I don't know what this warning message means:

[Physics.PhysX] QuickHullConvexHullLib: :FindSimplex: Simplex input points appear to be coplanar.

What does this mean? How can it be resolved? I can still run the game just fine and ignore it, but it shows up all the time.

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Answer by throwaway123321 · Apr 28, 2020 at 06:29 PM

I am not sure, but it appears that a post here https://forum.unity.com/threads/resolved-problem-with-physics-after-updating-unity-to-2018-3-simplex-input-points-coplanar.602017/ seems to imply that if you make a quad that have all points in the same plane, this can happen. Looking at the source, it happens in this function: https://github.com/NVIDIAGameWorks/PhysX-3.4/blob/master/PhysX_3.4/Source/PhysXCooking/src/convex/QuickHullConvexHullLib.cpp#L861

I don't know the solution right now, and it confuses me because my stuff works for a lot of coplanar quads. However when I set isConvex = true on the mesh colliders, that is when some of them start dying.

The solution I'd guess is that if you have any quads that are in the same plane, make a BoxCollider and put them in a new GameObject, and then rotate that around such that the quad is bound by it. If you have a mesh that is not a quad and they're all in the same plane, I am not sure what to suggest.

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