Reflection distortion only

[muoto]

Hello,

I want to set up a glass material that has a distorted reflection.
I could use some noise in the bump, but then it distords also the refraction.

So is there a way to have a normal refraction, but a distorted reflection ?

Thanks!

[Art48]

You can create a BlendMtl, put the refractive material in the base slot, then add a mirror-like material with no refraction and a bumpmap on top and mix accordingly?
Keep in mind though that this is unrealistic.

[benb32]

Have you tried the overide material?

http://docs.chaosgroup.com/display/V...RayOverrideMtl

[muoto]

yeah, used a normal glass + reflection as base, and a glass+ distorted reflection as overide in reflection. But didn't seem to work out. The reflection was still "flat"

[Art48]

I think you actually tell VRay to use that material when the OverrideMtl is reflected somewhere else. For example be green for GI calculations, be red in reflections, etc. So I think this is not the right way.

[muoto]

vraymtlblend with additive shellac seems to work.
one just refraction
one distorted reflection as coat.

not sure if there is a better way

[Art48]

You could duplicate your object and shell it maybe?

[Rens]

Hi, as mentioned you need a VRayBlendMtl.



- Create a VrayBlendMtl.
- Create a VRayMtl for the refraction, so set diff and refl to black and set refraction to white.
- Create a VRayMtl for the reflection, set diff and refraction to black and set reflection to white, disable 'Fresnel reflections'.
- Plug the refraction mat into the base and the reflection mat into the first coat of the VRayBlendMtl.
- Create a Falloff map or any other map that will allow you to create Fresnel falloffs (remember we disabled that in the reflection material).
- Set it to Fresnel mode.
- Plug it into the first blend amount slot.

Voila, now your material blends refraction and reflection correctly, without having to use additive shellac mode.

You can then put a bump map into the reflection material to have only the refl material distort the light.

Good luck! : )

[muoto]

quite simple indeed ! thanks a lot Rens