[TRACKER] GPUParticles issues

[Calinou]

This is a tracker for issues with the GPUParticles implementation in Godot 4.x.

This tracker does not list issues related to GPUParticles in Godot 3.x.

Bugs

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1. Particles2D don't disable emitting after one-shot, when starting off-screen #32803
   bug confirmed topic:particles topic:rendering +4
2. Unused variable in gpu_particles_3d_editor_plugin.cpp #43643
   bug topic:editor +2
3. Vulkan: GPUParticles3D makes fps goes down when selecting the Node #49170
   bug performance regression topic:3d topic:editor topic:rendering +6
4. Particle jitter on low speed scale, when the SceneTree is paused or when process mode is Disabled due to interpolation #50824
   bug confirmed topic:particles topic:rendering +4
5. GPUParticles interpolation does not affect property curves such as scale, color and rotation #51318
   bug confirmed topic:particles topic:rendering +4
6. Vulkan: GPUParticles3D Color ramp is messed #53851
   bug regression topic:3d topic:rendering +4
7. Memory leak with GPUParticles3D.set_process_material and Godot4 + GLES3 #54478
   bug topic:3d topic:particles topic:rendering +4
8. Vulkan GPUParticles3D related error spam with multithreaded renderer #54964
   bug confirmed topic:3d topic:rendering +4
9. Camera-aligned particles stop rendering past a certain amount #55511
   archived bug regression topic:3d topic:particles topic:rendering +6
10. Vulkan: GPUParticles trail leave a trail towards world origin when dying #55842
    bug confirmed topic:particles topic:rendering +4
11. Vulkan: GPUParticles3D/2D flicker when explosiveness is close to 1 #56691
    bug confirmed regression topic:particles topic:rendering +5
12. Vulkan: GPUParticles2D are offset when using global coordinates (Local Coords disabled) #56892
    bug confirmed regression topic:2d topic:rendering +5
13. Vulkan: Add a bounce threshold to GPUParticles to skip bouncing if the velocity is too low #57249
    bug confirmed topic:3d topic:rendering +4
14. Vulkan: GPUParticles trails show jagged shapes #57750
    bug topic:3d topic:rendering topic:shaders +4
    
15. Vulkan: ParticlesMaterial emission_color_texture causes unknown identifier error #58410
    bug topic:rendering topic:shaders +3
16. Vulkan: GPUParticles outlive lifetime #58525
    bug regression topic:particles topic:rendering +4
17. Vulkan: GPUParticles create artifacts upon instantiating due to scale interpolation issues #59072
    bug confirmed regression topic:particles +4
18. Vulkan: GPUParticlesCollisionSDF3D does not work after baking until the scene is saved and reloaded #60994
    bug topic:3d topic:editor topic:particles +4
19. Vulkan: GPUParticles3D attractor and collision Cull Mask doesn't have any effect #61014
    bug confirmed topic:3d topic:particles topic:rendering +5
20. Vulkan: GPUParticles3D are invisible if spawned at the same location as an attractor's origin #61066
    bug topic:3d topic:rendering +3
21. Vulkan: Rendering issues with GPUParticles3D skinned mesh particle trails #62170
    bug documentation topic:3d topic:rendering +4
22. GPUParticles3D error spam 'ERROR: Condition "!multimesh" is true.' #65888
    bug confirmed topic:rendering +3
23. GPU Particles2D Visual Artifacts when changing Scale + Lifetime together #72919
    bug topic:2d topic:particles topic:rendering +4
24. GPUParticles3D flickers frozen particle at world origin (0, 0, 0) when shader material has y-billboard set #72650
    bug confirmed topic:3d topic:particles topic:rendering +5
25. Instancing GPUParticles3D Causes Flashes Onscreen #71935
    bug confirmed topic:3d topic:particles topic:rendering +5
26. Moving GPUParticles2D with collision enabled causes particles to collide with nothing #77553
    bug confirmed topic:2d topic:particles topic:rendering +5
27. Particles change when they are fully stopped #78771
    bug confirmed topic:particles topic:rendering +4
28. GpuParticle2D particle trail error when contacting collision during viewport movement. #86173
    bug topic:2d topic:particles topic:rendering +4
29. Wierd particle state after reset the process material in GPUParticle2D #87178
    bug topic:2d topic:particles topic:rendering +4
30. Particle sub-emitters can fail to emit when their parent emitter has a high fixed_fps #95195
    bug topic:particles +2
31. GPUParticles3D collision point is unpredictable depending on particle collision speed #95510
    bug needs testing topic:3d topic:particles +4

Enhancements

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1. Particle flag keep_data does not preserve trail position #54773
   enhancement topic:particles topic:rendering topic:shaders +4
   
2. Vulkan: GPUParticles2D attractors not implemented yet (unlike in GPUParticles3D) #60909
   enhancement topic:2d topic:particles topic:rendering +4
3. Document using GPUParticles2D collision #60910
   documentation enhancement topic:2d topic:rendering +4

Pull requests

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1. Reorder properties in the Particle node inspectors for better usability #48385
   enhancement for pr meeting topic:editor topic:particles usability +5
2. Implement blending in particle flipbook animation #50442
   enhancement topic:3d topic:particles +3
3. Fix GPUParticles2D wrong lifetime draw order on first particle #55382
   archived bug topic:2d topic:particles topic:rendering +5
4. Document GPUParticles3D attractors and collision #60992
   documentation enhancement +2
5. Use a different color for GPUParticlesAttractor3D editor gizmos #61068
   enhancement topic:3d topic:editor usability +4
6. Add "Hide on Contact" collision mode to ParticlesMaterial #61238
   enhancement topic:3d topic:particles +3
7. Fix ParticlesMaterial collision friction/bounce at low velocity #61245
   bug topic:3d topic:particles +3
8. Tweak the GPUParticles3D Transform Align property hint for readability #61246
   enhancement topic:3d topic:editor +3
9. Implements GPUParticles3d layer mask #62091
   archived bug topic:3d topic:rendering +4