I’m currently working on a project that has a fair amount of carbon fibre parts on it. I’m trying to create a realistic Carbon Fibre material that has the base weave covered by a glossy coat, so instantly i went for the VRayBlendMtl. To create a realistic result i need the bottom layer, being the weave, to reflect light at different angles based on the weave pattern. While the glossy top coat reflects like a normal car paint type material. Obviously if i put a bump the bottom layer weave if effects the glossy coat also, which leads to my question.
Is there anyway to bump the bottom layer while having the top layer unaffected?
Reference Image. Notice the bottom layer weave reflects light based on the angle of the weave, while there is still a glossy coat covering the surface.
I’ve looked at most of these materials, they’re all the same just a simple diffuse map with reflection on top. None of them have the specific layered effect I’m after.
Your may be onto something with Shellac though, i’ll play around with that see what i can get.
actually this would be the correct way to do it, and the vray blend mat does just that. a bump map on the base layer does not affect the coating/s.
here’s a quick try. vray blend mat, bottom layer is reflective with low glossiness and has bumb; top one it’s just a reflective coating, mirror like. as you can see the reflections on the coating are not affected by the underlying bump.
Please rivoli, can you tell me how to put a coat layer affecting only in the reflections and not in the diffuse without activating the additive mode in vrayblend?
eh, cheers for that it was very quickly put together. even though the bump map it’s accurate enough, the spec one doesn’t really match, and I guess a diffuse map might add some realism if properly painted.
I usually make the coating 100% reflective and then tweak it with a falloff map in the blend amount slot. being totally reflective it doesn’t affect the diffuse of the base layer.
Nice teapot!
so vray can read coloured maps as anisotropic rotation maps? - I just presumed it only accepted black and white maps, but obviously not… unless you changed the red and blue map peter to greyscale?
Vray reads ani. directions through the black\white range. So a gradient mapped on a box with black at the bottom and white at the top, will direct the “grain” along the gradient. To achieve the circular pattern, you can use a gradient set to spiral to controll it.
so, I just haven’t had time recently to test this, but will Vray therefore convert the coloured map into a B&W map? Just trying to understand what happens - will test this as soon as I have met some deadlines!
it was very quickly put together. even though the bump map it’s accurate enough, the spec one doesn’t really match, and I guess a diffuse map might add some realism if properly painted.