I have unwrapped model with two vertex groups. And i try to add different materials to each of them. Never thought it can be a problem. I do the usual:
- Select vertex group
- Assign material.
In preview mode everything looks normal, like this:
But when i render model i have strange artifacts.
I know that i can use UV-Map as mask and just combine two shaders (each for different part of model) in one materal. As described here http://blender.stackexchange.com/questions/516/add-different-materials-to-different-parts-of-a-mesh
I’ve already tried this and it works fine. But still, i want to fint out why there is a problem with vertex groups and materials? Materials assigned to vertex groups is not Cycles ideology, and only fit for Inernal?
UPD: No, second method does not work fine. Artifacts now at another part of model.