I am wondering why for example with real road shader two diff maps SEVEN UV channels are added ? In rF2_tracktechnology.pdf which I use it is showed that seven stages of textures are sharing three channels. Then similar thing is with multi layer grass shader, six UV channels are added, but in rF2_terrain_shader.pdf it is showed that shader is using four UV channels. @Traveller Why there is UV channel made for each texture stage ? Also in Blender _rfactor_IO.pdf in page 33 it is written that there will be from one to four UV layers, which seems not to be so. Also it is written not to rename or delete the layers.