Investigating why some visual effects don't pause
when the tree is paused. Namely, the particles
generated by the GPUParticles2D node
seem to continue moving around when paused and my
shaders that use TIME keep animating
even when paused.
For GPUParticles2D, this issue seems
related: https://github.com/godotengine/godot/issues/85213
And it appears that someone is working on a fix.
For my shader, it appears that the canonical solution for this is to use a global shader variable:
RandomShaper
No version of this branch for 4.0 is needed, since it introduces global shader variables, with which one can easily implement their own version of this.
See: