PhysX: Simplex input points appers to be coplanar.

Unity Engine
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1

I get this error when setting a collider as convex after creating in code for a particular mesh (essentially a box though…)
Thing is, the collider is created so I do not know what PhysX is complaining about. (Unity 2020 LTS)
It seems entirely ignorable, but the error is very much visible in the editor

[Physics.PhysX] QuickHullConvexHullLib::findSimplex: Simplex input points appers to be coplanar.
Failed to create Convex Mesh from source mesh "wall_1". An internal unspecified error has occured that could mean the Quickhull algorithm found the input mesh topologically challenging.
2

Why are you making a mesh collider for a cube?
Use a box collider instead.

3

it is an option, but the bug remains

4

Check the model. I think your model is wrong. Some things are redundant. It may be that the object is too small to participate in the calculation of rigid body motion

5

That basically means your mesh is broken in some way, that doesn’t allow to create a convex hull out of it. Look out for duplicate triangles, inconsistent winding order, etc.