Material IDs and UVs

Scizz

Just a quick question. If two-sides of an object that are identical, share the same UV space, yet have different material IDs, will the materials I apply to the IDs be different, or the same because they share the same UV space.

passerby

they will be different because they got different materials, the UVs just define where on a texture to get the information from, the materials define what the information is.

Scizz

Ahhh, good to know. Thank you so much!

Scizz

Also, is there some sort of "rule of thumb" as far as an appropriate number of MAT Ids on an object? Does having a lot of Mat IDs bog down performance more than having a bunch of unique textures and materials.

passerby

Ya each one results as a new draw call

Scizz

So a modular asset with 4 mat ids is a bad idea? Will it have to call 4 times for each of the same model?

sprunghunt

Scizz wrote: »

So a modular asset with 4 mat ids is a bad idea? Will it have to call 4 times for each of the same model?

yes - that is not as efficient as having a single material ID