GridMap lighting issues when using imported meshes as tiles

[fantaandcode]

Godot version

4.0 beta 1

System information

EndeavourOS 64-bit, 5.19.8-arch1-1 kernel, Ryzen 5 3600, Nvidia RTX 3090, Vulkan on driver version 515.65.01

Issue description

When I use a GridMap with imported Blender meshes, it causes problems with the lighting/shadows as shown below. There is a distinct line where a shadow is made, regardless of location, distance from camera, and light rotation. I've tested with a flat plane MeshInstance and the lighting problem does not show. Toggling the GridMap visibility will also turn off this lighting inconsistency.

This problem actually showed up when I switched from alpha 15 to alpha 17. However, upon checking out the beta and seeing that the bug was still present, I'm making this bug report.

Steps to reproduce

1. Make a 3D model in Blender
2. Export to GLTF
3. Import into Godot as new scene
4. Scene -> Export As... -> MeshLibrary...
5. Create GridMap
6. Add MeshLibrary created above as the Mesh Library for the GridMap
7. Paint tiles on GridMap
8. Create an OmniLight3D or Spotlight3D

Minimal reproduction project

Grid Map Lighting Bug.zip

I've included the .blend file of the tiles I made for this test.

[Calinou]

This is likely caused by the switch to octahedral compression for imported meshes. Try removing the .godot/ folder while the editor is closed, then open the editor again. See #64854.

[fantaandcode]

So, it worked for the test that I uploaded. However, it seems to still pose a problem. Would this be a problem with when I initially imported it via Blender? I see that .blend files are no longer showing up in the File Browser.

[Calinou]

I see that .blend files are no longer showing up in the File Browser.

Double-check that Blender import is enabled in the Project Settings and that a Blender path is set in the Editor Settings.

[fantaandcode]

So, it was initially having the same problems. Upon redoing the import process, it works now.