[TRACKER] VoxelGI issues

[Calinou]

This is a tracker issue for voxel-based global illumination (formerly GIProbe in 3.x). See #55327 for SDFGI issues, #56033 for LightmapGI issues and #66628 for ReflectionProbe issues.

This tracker only tracks issues in the master branch, not 3.x.

Bugs

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1. Vulkan: Moving a light in a VoxelGI is extremely slow if no mesh has a Global Illumination Mode set to Baked #36121
   bug performance topic:3d topic:rendering +4
2. Vulkan: Crash when resizing a VoxelGI's extents to 0 via dragging in the Inspector #36702
   bug confirmed crash topic:3d topic:editor topic:rendering +6
3. Vulkan: VoxelGI and LightmapGI incorrectly calculating the light for the same object #38020
   bug confirmed topic:3d topic:rendering +4
4. Vulkan: Dynamic VoxelGI is not working #41642
   bug topic:3d topic:rendering +3
5. Vulkan: MeshInstance3D nodes with Dynamic Bake mode are very expensive in VoxelGI, regardless of quality settings #55359
   confirmed enhancement performance topic:3d topic:rendering +5
6. Saving the scene after baking lightmaps or VoxelGI will save the lightmap/VoxelGI data as a built-in file, despite being prompted to save it to an external file beforehand #50029
   bug high priority topic:3d topic:editor usability +5
7. Vulkan: Weird behavior with emissive materials when VoxelGI and ReflectionProbes is set as Interior #50751
   bug confirmed topic:3d topic:rendering +4
8. Vulkan: VoxelGI generates wrong lighting #52791
   archived bug topic:3d topic:rendering +4
9. Vulkan: Baking VoxelGI causes Editor Hang if no meshes have global illumination set to either Baked or Dynamic #53348
   archived bug performance topic:3d topic:rendering +5
10. VoxelGI information label is cut off #53529
    bug topic:3d topic:editor +3
11. Vulkan: VoxelGI and SDFGI rendering exhibits a visible outline between surfaces and the sky #54978
    bug topic:3d topic:rendering +3
12. Vulkan: SDFGI and VoxelGI are only combined correctly if VoxelGI is enabled *after* SDFGI, not before #55334
    bug topic:3d topic:rendering +3
13. Vulkan: VoxelGI is much brighter at 512 subdivisions compared to 64, 128 or 256 subdivisions #55639
    bug topic:3d topic:rendering +3
14. Vulkan: VoxelGI VRAM size estimation is inaccurate #55641
    bug topic:3d topic:editor topic:rendering +4
15. Vulkan: VoxelGI does not take MultiMeshes into account for baking #56024
    bug topic:3d topic:rendering +3
16. Vulkan: Full-size GI rendering still results in slightly blurry edges #56792
    bug topic:3d topic:rendering +3
17. Vulkan: VoxelGI displays outside the extents when its extents are not uniform #62930
    bug confirmed topic:3d topic:rendering +4
18. Vulkan: VoxelGI does not take custom shaders into account for emission if the mesh's GI mode is Static #64124
    documentation topic:3d topic:rendering topic:shaders +4
19. Vulkan: VoxelGI emission for meshes with Dynamic GI mode is much darker than Static #64125
    bug topic:3d topic:rendering +3
20. Vulkan: GPU validation errors in VoxelGI #66857
    bug topic:3d topic:rendering +3
21. Vulkan: Volumetric Fog breaks when number of visible VoxelGI nodes changes #69565
    bug confirmed topic:3d topic:rendering +4
22. Vulkan: VoxelGI reflection rendering is incorrect on transparent materials #69783
    bug topic:3d topic:rendering +3
23. Vulkan: VoxelGI looks incorrect when using an orthogonal camera #69784
    bug confirmed topic:3d topic:rendering +4
24. Vulkan: VoxelGI and SDFGI changes with head position in XR #73403
    bug confirmed topic:3d topic:rendering topic:xr +5
25. VoxelGI does not preserve CameraAttributes across scene reloads #74134
    bug topic:3d topic:rendering +3
26. Vulkan: VoxelGI Indirect Lighting from Static Omni Light is broken until manually re-setting gi data in Rendering Server #78373
    bug confirmed topic:3d topic:rendering +4
27. VoxelGI not showing at runtime. Only manually activating .bake() in code makes it visible. #78569
    bug topic:3d topic:rendering +3
28. Vulkan: VoxelGI reflections appear to jitter when the camera rotates #84184
    discussion topic:3d topic:rendering +3
29. Vulkan: Shadows in VoxelGI voxel scene that do not appear in the rendered scene #84992
    bug confirmed topic:3d topic:rendering +4
30. VoxelGI: Incorrect reflections after a rebake #90956
    archived enhancement topic:3d topic:rendering +4
31. Incorrect shadows appear with meshes that have Static bake mode if VoxelGI node isn't at the world origin #90976
    bug confirmed topic:3d topic:rendering +4

Enhancements / Discussions

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1. Vulkan: VoxelGI shows artifacts on highly reflective materials #50842
   bug topic:3d topic:rendering +3
2. Self-reflection is visible in metallic materials with VoxelGI due to bias being too low #52114
   documentation topic:3d topic:rendering +3
3. Vulkan: VoxelGI does not take SpatialMaterial UV scale/offset into account in reflection #52115
   bug confirmed topic:3d topic:rendering +4
4. Vulkan: VoxelGI metallic materials appear as bright as non-metallic materials in reflections #55335
   enhancement topic:3d topic:rendering +3
5. Unpredictable VoxelGI lighting with interior scenes #80123
   needs testing topic:3d topic:rendering +3
6. Vulkan: VoxelGI creates glowing shadow edges #83025
   discussion topic:3d topic:rendering +3

Proposals

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1. Emit a node configuration warning when VoxelGI extents or subdivision size is changed, but it wasn't re-baked yet godot-proposals#3637
   topic:3d topic:editor +2
2. Allow irradiance and radiance to be manually sampled in spatial shaders godot-proposals#2904
   topic:3d topic:rendering topic:shaders +3
3. Allow SDF Reflections or SDF GI to be used independently from each other godot-proposals#3012
   topic:3d topic:rendering +2
4. Add a node to exclude specific areas from being affected by GI godot-proposals#1380
   topic:3d topic:rendering +2