GpuParticle3D Missbehave (position, scale, color)

[ciptakelvin]

Godot version

4.0 stable

System information

Windows 11

Issue description

GpuParticle3D scale, color not working on process material.
Emitting position at Global Position Vector3(0,0,0) first frame

Steps to reproduce

1. Add GpuParticle3D
2. Create basic process material
3. Process material scale, color adjustment

Minimal reproduction project

N/A

[clayjohn]

Do you have vertex_color_use_as_albedo enabled in the material used to render the particles?

Please see https://docs.godotengine.org/en/latest/classes/class_particleprocessmaterial.html#class-particleprocessmaterial-property-color

[Calinou]

@ciptakelvin Please upload a minimal reproduction project to make this easier to troubleshoot.

For the scale property to work (if billboarding is enabled), Billboard must be set to Particle Billboard and Billboard Keep Scale property must also be enabled on the StandardMaterial3D used by the particles mesh.

Emitting position at Global Position Vector3(0,0,0) first frame

See #72650.

[Calinou]

Closing due to lack of response. Please comment if you can still reproduce this bug on the latest Godot version, with Vertex Color > Use As Albedo and Billboard Keep Scale enabled on the BaseMaterial3D used by the mesh rendered in the particles node.

See #18365 for original rationale as to why a opt-in Keep Scale property is needed.

PS: Since no minimal reproduction project was included in the original bug report, please upload one as well to ease troubleshooting.