GPUParticle2D jitter since Godot Beta 10

[sgervais333]

Godot version

4.0beta10 (4.0beta11)

System information

Windows 11, Vulkan API 1.3.224 - Vulkan NVIDIA GeForce RTX 3080 Ti

Issue description

GPUParticle2D seems to jitter since Godot Beta 10 (I have the same problem Godot Beta 11).

Here is what I expect (screen capture of the project in Godot Beta 9):

Here is what I got in Godot 4.0beta10 and Godot 4.0beta11:

Steps to reproduce

1. Make 2DScene
2. Add GPUParticle2D
3. Set the Process Material of this GPUParticle2D to a new ParticleProcessMaterial
4. Move the particle around (or make a animationPlayer to move the Particle)

Minimal reproduction project

TestProject.zip

[Calinou]

I can confirm this on 4.0.beta11 (it's visible in https://github.com/godotengine/godot-demo-projects/tree/4.0-dev/2d/particles). This occurs when moving a GPUParticles node with Local Coords disabled.

It's worth checking whether this issue occurs in 3D as well.

Can you reproduce this after disabling Interpolate and setting Fixed FPS to 0 on the GPUParticles node? See #70777.

[clayjohn]

I have a feeling this is caused by #70418 we will need to investigate further

[sgervais333]

I can confirm this on 4.0.beta11 (it's visible in https://github.com/godotengine/godot-demo-projects/tree/4.0-dev/2d/particles). This occurs when moving a GPUParticles node with Local Coords disabled.

It's worth checking whether this issue occurs in 3D as well.

Can you reproduce this after disabling Interpolate and setting Fixed FPS to 0 on the GPUParticles node? See #70777.

It fixes it when I disable Interpolate and set Fixed FPS to 0 on the GPUParticles node. So I assume it is liked to #70777

I only need to set Fixed FPS to 0 to make it work like expected (no jittering).

[sgervais333]

The problem is still in Godot Beta 12.

It's like the Interpolate have no effect.

[akien-mga]

Fixed by #71520.