Godot version

4.0.2 stable

System information

win10 960m + win11 3050

Issue description

The transparency parameter on a geometry instance 3d object only works in the forward+ renderer. It does not work with the vulkan mobile or opengl compatibility renderers.

@clayjohn has confirmed that it has not been added to these renderers.

Steps to reproduce

• add a cube mesh
• move the transparency slider

Minimal reproduction project

Not really necessary.