you can Lerp two textures together with a mask(something like a cloud or whatever). That mask can have a texture coord linked to it to increase/decrease the scale of the mask. also decals
Might be you're multiplying one of the clouds texture samples by 4 and the inverse of that by 2 and then adding the vertex colors one more time to that result, just a guess though. EDIT: The more I think about it, just change the "Add" above the "Constant 20" to a Multiply, that way the vertex colors act as a mask.…