Vray Render elements, Mtl_select

[Felix2]

Hi,

It seems that vray_mtlselect render pass isnt working right? I put vray material with dirt in diffuse slot into vray_mtlselect parameters material slot and when I render I get black render with alpha in the alhpa channell? why I cant get dirt in there?

Another problem is that I cant drag any material from meditor to vraymtlselect material slot and neither viceverse. I think this is a bug?

[vlado]

You need to have the material applied to something in your scene. VRayMtlSelect only extracts this material from the image and puts it in its own layer.

Render elements in V-Ray can only extract information that is computed during the normal course of rendering calculations; they cannot show information that is not in the rendering.

Best regards,
Vlado

[Felix2]

I see. now its works fine. drag drop bug is not the big problem sience u can select the materials from meditor dialog

anyways. I was looking for extra pass for ambient which I made with dirtmap. but if I need to add this dirtmap to all scene objects then I can use mtl override and just output the ambient pass.

What is the use of mtlselect? what is the difference of mtl override and mtlselect then?

[instinct]

I think you misunderstood the purpose of Mtl_Select. It is not meant as an alternate Material Element, but it is meant to isolate a specific material in a seperate renderelement. That way you can render out an extra element that contains only the objects that have the materials applied.

Regards,
Thorsten

[Felix2]

yea. I was just looking something handy now this is very clear.

thanks! :P