I’m really sorry, I should have been clearer haha.
This is before-
and this is after the material is applied
What I want is for the walls to become the rainbow rather than the background.
Keep in mind the objects you see like the icicles, plants, and nuclear crates aren’t a part of the cave png, they’re separate sprites. So are the rocks in the background - all separate sprites other than the cave. The cave is just in front of them on the y axis, that’s why the rainbow covers them.
What I want is for the rainbow to go over the opaque areas, not the transparent ones (the insides of the cave).
Thank you for responding though, I know you’re probably really busy.