Incorrect rendering when renderOverlay is set to true for meshes

[PolygonalSun]

In BabylonReactNative, when you set renderOverlay to true for a mesh, the overlay will display with inconsistent color across the mesh: iOS Android

Note: This behavior is not present in BabylonNative.

Bugs

Repro:

Set renderOverlay to true for one of the meshes in App.tsx

Expected result:

Uniform overlay look and color

Current result:

See pics above

[bghgary]

This is what happens on the PG. I think there is some z-fighting issues in native. https://playground.babylonjs.com/#JPXG9M

[bghgary]

The issue is that renderOverlay uses zOffset which is not supported in Babylon Native yet because it's not supported in bgfx.

https://github.com/BabylonJS/BabylonNative/blob/762acec36b069ebf37cc6b30b8d5d974c550ffe3/Plugins/NativeEngine/Source/NativeEngine.cpp#L806-L808

Removing bug tag.

[bghgary]

Log an error when this happens for now.

[bghgary]

This issue probably shouldn't be closed. It is still a problem even though we added a warning.