Billboard Material not working in Double Precision Build

[scuzzar]

Godot version

Godot 4.0 [5726770...] + precision=double

System information

Windows 11

Issue description

If i open the attatched project in my custom build using precision=double, the billboard of the particles is seaming not to work, basicaly ignoring the billboard setting all togeter.

I am using a QuadMesh as particle Mesh.

Opening the same Project in without the precision=double setting, and it is working.

Steps to reproduce

build using precision=double (i tryed several commits, all the same)

create CPUParticles3D

Add a Quad Mesh

Add a Material to the Mesh

Set Billboard to On

Minimal reproduction project

Billboard_Bug.zip

[jwatsn]

Not sure if this will help, but I've noticed this bug is caused due to not being able to modify MODELVIEW_MATRIX in the shader vertex function when in double precision build. I found a work around:

VERTEX *= mat3(MODEL_MATRIX * mat4(VIEW_MATRIX[0], VIEW_MATRIX[1], VIEW_MATRIX[2], VIEW_MATRIX[3]));

But this wont work in things like Label3D or Sprite3D since you can't edit its shader

[cridenour]

This will be fixed by #75462.

[Calinou]

Closing in favor of #75433, which has more information about the issue at hand.