Hello. Let's say we have a model with two textures assigned to it: Now imagine this object is an apartment or a tree or something that will be copied several times in a scene and will be used in a game, Also the green texture will be used in some other object,Should this model use one texture 2D (which would be a texture…
Something else to keep in mind is the number of render calls. If you have one object with 3 textures sets (materials), then you'll have 3 render calls. If the object has one atlas texture set, then it's only one render call. Render calls happen in the CPU, so you want reduce the number of render calls. Both types of models…