[TRACKER] SDFGI issues

[Calinou]

This is a tracker issue for signed distance field global illumination. See #55328 for VoxelGI issues, #56033 for LightmapGI issues and #66628 for ReflectionProbe issues.

SDFGI is only present in the master branch, so this tracker does not contain 3.x-specific issues.

Bugs

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1. Vulkan: GridMap is not included in SDFGI baking #40617
   bug confirmed topic:3d topic:rendering +4
2. Vulkan: Indirectly lit surfaces show up black in reflections when using SDFGI with Bounce Feedback set to 0.0 #49836
   documentation topic:3d topic:rendering +3
3. Vulkan: Rendering error with SpotLight and SDFGI #52411
   archived bug topic:3d topic:rendering +4
4. Vulkan: SDFGI reflect wrong with depth texture read #54176
   documentation topic:3d topic:rendering topic:shaders +4
5. Vulkan: SDFGI does not make the editor redraw until it has fully converged #54892
   bug topic:3d topic:editor topic:rendering +4
6. Vulkan: VoxelGI and SDFGI rendering exhibits a visible outline between surfaces and the sky #54978
   bug topic:3d topic:rendering +3
7. Vulkan: SDFGI does not take custom ambient light settings into account when Read Sky Light is enabled (unlike VoxelGI) #55104
   bug confirmed topic:3d topic:rendering +4
8. Vulkan: Lights with Bake Mode set to Static cause SDFGI to become infinitely bright as the camera moves #55322
   bug topic:3d topic:rendering +3
9. Vulkan: SDFGI and VoxelGI are only combined correctly if VoxelGI is enabled *after* SDFGI, not before #55334
   bug topic:3d topic:rendering +3
10. Vulkan: Full-size GI rendering still results in slightly blurry edges #56792
    bug topic:3d topic:rendering +3
11. Vulkan: Flood of GI errors when queue_free()ing a .tscn containing a OmniLight3D when SDFGI is enabled (!light_storage->owns_light_instance(light_instance)) #57840
    bug confirmed topic:3d topic:rendering +4
12. Vulkan: SDFGI and the use of an Orthogonal Camera generates some artifacts on screen #60522
    bug confirmed topic:3d topic:rendering +4
13. Vulkan: Console keeps spamming error when scene is empty while SDFGI is turned on #60533
    bug confirmed topic:3d topic:rendering +4
14. Vulkan: SDFGI Artifacts due to sky sampling when Read Sky Light is enabled #61504
    bug topic:3d topic:rendering +3
15. Vulkan: VoxelGI and SDFGI flicker when TAA is enabled #62080
    bug confirmed topic:3d topic:rendering +4
16. Vulkan: SDFGI is still drawn when the unshaded debug draw mode is enabled #62758
    bug topic:3d topic:rendering +3
17. Vulkan: SDFGI does not obey custom Sky Rotation values #62793
    bug confirmed topic:3d topic:rendering +4
18. Vulkan: VoxelGI and SDFGI changes with head position in XR #73403
    bug confirmed topic:3d topic:rendering topic:xr +5
19. Vulkan: Alpha transparency with GI disabled renders incorrectly when SDFGI is enabled #75848
    confirmed topic:rendering +2
20. SDFGI: Omnilights that have their bake mode set to static are culled very aggressively #77551
    bug topic:3d topic:rendering +3
21. Vulkan: SDFGI incorrectly reads certain high-contrast textures for cascade generation #85058
    bug confirmed topic:3d topic:rendering +4
22. SDFGI will only enable if you unassign baked light data from LightmapGI nodes #85702
    bug topic:3d topic:rendering +3
23. SDFGI produces wildly inaccurate and extreme lighting intensities on Intel Windows drivers #86833
    bug confirmed platform:windows topic:3d topic:rendering topic:thirdparty +6

Enhancements / Discussions

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1. SDFGI: Add method to regenerate data (instead of completely reinitializing) #39961
   archived feature proposal topic:3d topic:rendering +4
2. SDFGI: Massive slowdown when the camera speed is too fast (even on empty scenes) #41154
   confirmed discussion documentation performance topic:3d topic:rendering +6
   
3. Vulkan: SDFGI leaks light into enclosed spaces, even when Use Occlusion is enabled #50770
   documentation topic:3d topic:rendering +3
4. SDFGI Is Splotchy On Large Uniform Surfaces #50773
   documentation topic:3d topic:rendering +3
5. Vulkan: Improve SDFGI property adjustment usability #57366
   discussion enhancement topic:3d topic:editor topic:rendering +5
6. Vulkan: SDFGI light occlusion results in sudden deep blacks #62673
   discussion enhancement topic:3d topic:rendering +4
7. Vulkan: SDFGI has artifacts on off-axis geometry due to bias being too low #62671
   discussion topic:3d topic:rendering +3
8. Vulkan: SDFGI reflections appear to jitter when the camera rotates slowly #74633
   discussion topic:3d topic:rendering +3

Proposals

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1. Allow irradiance and radiance to be manually sampled in spatial shaders godot-proposals#2904
   topic:3d topic:rendering topic:shaders +3
2. Allow SDF Reflections or SDF GI to be used independently from each other godot-proposals#3012
   topic:3d topic:rendering +2
3. Implement caching in SDFGI to avoid stuttering when the camera is moving godot-proposals#3024
   performance topic:3d topic:rendering +3
4. Add a node to exclude specific areas from being affected by GI godot-proposals#1380
   topic:3d topic:rendering +2