[TRACKER] Raster occlusion culling issues

[Calinou]

This is a tracker for issues related to raster occlusion culling (the kind of Embree-based occlusion culling used in 4.0).

This tracker does not list issues related to portals and rooms occlusion culling, or geometry occlusion culling featured in 3.x.

See also #57416, which is another common optimization used in 3D rendering.

Bugs

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1. Vulkan: Raster occlusion incorrectly culls objects through gaps #53288
   bug confirmed topic:3d topic:rendering +4
2. Vulkan: Raster occlusion margin is too big on baked occluders #63771
   bug confirmed topic:3d topic:rendering +4
3. Occlusion culling causes CPU-related frametime spikes when OccluderInstance3D nodes' visibility is toggled #70373
   discussion performance topic:3d topic:rendering +4
4. Occlusion culling buffer is still updated when moving hidden OccluderInstance3Ds #70375
   enhancement performance topic:3d topic:rendering +4
5. Vulkan: Occlusion culling incorrectly culls objects which are not completely occluded #70516
   archived bug regression topic:3d topic:rendering +5
6. OccluderInstance3D baking does not ignore ShaderMaterials that are transparent #91030
   bug topic:3d topic:rendering +3

Enhancements

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1. Vulkan: Disallow choosing the Occlusion Culling Buffer debug draw mode when occlusion culling is disabled in the Project Settings #50154
   enhancement topic:3d topic:editor +3
2. Take CSG nodes into account for occluder generation (occlusion culling) godot-proposals#2910
   topic:3d topic:editor topic:rendering +3
3. Enable SSE 4.2 in Embree to improve occlusion culling (and CPU lightmapper) performance godot-proposals#3932
   performance topic:3d topic:core topic:rendering +4
4. Make the occlusion culling debug draw mode display a translucent overlay instead of replacing the viewport godot-proposals#2911
   topic:3d topic:editor topic:rendering usability +4