LightmapGI: Pixellated Shadows

[WickedInsignia]

Godot version

4.0 Alpha 12

System information

Windows 10, GTX1080, i7 6700

Issue description

Godot 4's LightmapGI exhibits pixelated shadows. This is a regression from the improved CPU lightmapper in 3.x.

Godot 4's lightmap shadows with a directional light:

Godot 3's lightmap shadows with identical scene settings:

Steps to reproduce

• Open MPR
• Optionally, bake any light in Godot 4 with shadows active

Minimal reproduction project

Godot 4:
LightmapQualityExampleG4.zip

Godot 3.4.4:
LightmapQualityExampleG3.zip

[Calinou]

Duplicate of #49935.

[WickedInsignia]

@Calinou I noticed light bleeding in G4 vs G3.
Could this be due to the lack of bicubic sampling or possibly another issue?
Just gauging whether to bother with a report to keep track of it.

Godot 4:

Godot 3:

[Calinou]

@Calinou I noticed light bleeding in G4 vs G3.
Could this be due to the lack of bicubic sampling or possibly another issue?
Just gauging whether to bother with a report to keep track of it.

Please create a separate issue with a minimal reproduction project attached. I could notice increased lightmap bleeding when updating the global illumination demo to readd lightmaps, but haven't found any combination of settings that resolves it.

Edit: Issue opened: #63437