Carbon Fibre Material Query

[Short_Fuse]

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.

[timmatron]

I don't know too much about Vrayblend but it sounds like Shellac would do what you are describing. Tough material to master though, it would seem.

[timmatron]

OR.... http://www.vray-materials.de/all_mat...&Submit=Search

[Short_Fuse]

OR.... http://www.vray-materials.de/all_mat...&Submit=Search

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.

[rivoli]

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?

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.

[natty]

Hi

In the future these sort of posts should be kept in the general section please as this section is for vray problems.

N

[gagui]

Are you using the aditive mode for this?

[rivoli]

Are you using the aditive mode for this?

no, additive unchecked.

here's another one, which looks a bit like carbon fiber:

[simmsimaging]

That's a nice start Rivoli.

b

[gagui]

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?

[rivoli]

That's a nice start Rivoli.

b

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.

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?

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.

[trixian]

You should probably make a map for the anisotropic angle instead of bump for the reflections. Any bump will be very subtle in this kind of material.

[peterguthrie]

I did the attached teapot a while back using the carbon fibre anisotropic rotation map on this page: http://www.xsi-blog.com/archives/197

[sv]

I did the attached teapot a while back using the carbon fibre anisotropic rotation map on this page: http://www.xsi-blog.com/archives/197

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?

[peterguthrie]

ummmm.. not sure! I just tried it and it came out looking OK!