Look into decal tri planar projection ← that’s the keyword to search for. As in:
There’s should be some examples around. Don’t have the definitive tut at hand.
bend to accord with the mesh texture
Geometry, right?
What I’m looking for is for this plane to appear over top of every mesh like so:
Not sure if I’m recommending the right technique. Are we talking about disabling depth? Now that I read the topic again, it seems that you want something entirely else than I thought. My bad.