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GPU Particles 3D dies if their "Scale Curve" stays in zero for too long

Open WagnerGFX opened this issue 2 years ago • 2 comments

Godot version

v4.1.2.stable; v4.2.beta2

System information

Godot v4.2.beta2 - Windows 10.0.19045 - Vulkan (Forward+, Mobile) - GLES3 (Compatibility) - dedicated NVIDIA GeForce GTX 1650 (NVIDIA; 31.0.15.3742) - Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz (8 Threads)

Issue description

3D particles with a scale curve that stays in zero for a period of time will die silently.

  • The period seems to be around 0.05+ of the normalized curve time.
  • Those particles disappear and don't emit sub-particles.
  • 2D particles don't have the same issue.

The workaround is to use small values, like 0.001, instead of absolute zero.

Scale Curve

Steps to reproduce

The reproduction project has a "main_3d" scene that shows the issue, even in the editor. There is also a "main_2d" scene to show that 2D particles work fine using the same curve.

Minimal reproduction project

GPUParticle3D Scale Curve Zero.zip

WagnerGFX avatar Oct 20 '23 20:10 WagnerGFX

  • Related to https://github.com/godotengine/godot/issues/68809.

Calinou avatar Oct 20 '23 20:10 Calinou

Tested in v4.3-stable and v4.4-dev6. The issue is still the same.

WagnerGFX avatar Dec 15 '24 17:12 WagnerGFX