normalmap appears incorrect on some meshes

[djmaesen]

Godot version

4.0 alpha16

System information

linux

Issue description

some of my models have strange normal map behaviour,
i think this might be with the new normal/tangent compression since alpha 15

Steps to reproduce

have a look at my screenshot

Minimal reproduction project

No response

[Calinou]

Can you reproduce this in 4.0.alpha14 or older alphas? Make sure to create a new project from scratch to test this.

Also, please upload a minimal reproduction project to make this easier to troubleshoot.

[djmaesen]

works fine in alpha 14
test.zip

[clayjohn]

I ran the test project and reproduced the errors. The errors went away when I reimported the mesh.

There is a connected usability issue here though (that is reported and tracked in #64854) Users who import files, then extract the ArrayMesh and save it into a TSCN format don't benefit from reimporting their meshes which makes changes to the ArrayMesh format extra dangerous for them.

Closing this now as all outstanding issues should be tracked in #64854

[djmaesen]

i tried reimporting several times but i get the same result, strange

[djmaesen]

@clayjohn i tried setting up a clean project in alpha 16 imported the .glb model , assigned the normal map and the problem is still there.