As a Roblox developer, it is currently too hard to make a flat material
The closest thing we have to a flat material is SmoothPlastic. The “None” material would be similar, but it wouldn’t have any texture and no bump, displacement or reflectance maps. Just a plain, shading-less material.
What are your use cases?
You can use surface UI or ImageHandleAdornments to get planes without shading.
Won’t those add rendering cost? Imagine building an entire world out of them. Also what about CSG/Meshes?
Exactly, which is why OP should specify use cases. If they just want a few planes without shading then UI / handleadornments won’t give any noticeable performance impact, but if they want to have the whole map that way they might want to point this out and also explain why they need it
As an experienced builder, I think this is an alright suggestion. However, I just don’t see many uses that I could get out of it. What could this possibly help with?