martial: I don't have Vue Infinate but in Vue 4 it's possible to either modify an existing material (using different texture maps) or make a new material using different maps and asign that to the object/s in question.

synergy543: Virtually every program that exports .obj files creates a mtl (material) file that provides a basic but functional way to transfer material info - ie colour, bump maps. If you open one in a text editor you will see better than me trying to explain!

The problem is that different software sometimes creates the mtl files slightly different and this is where problems often arise when using the exported object/s in another program.

I usually find it quicker to develop new materials in the software I use and apply those rather than relying on .mtl files.