BlendMtl, MtlSelect, compositing problem

[gisi]

Hi,

I am using a VrayBlendMTL as a carpaint shader. Coat on top (with a VrayFresnel as BlendAmount), VrayFlakesMtl, and a standard VrayMtl as base material. Rendering layers with Render Elements and MtlSelect in a linear workflow as EXR doesn`t produce the same result in compositing as the master layer (no Render Elements). Am I doing something wrong, or what is the best way for compositing the layers?

Gisi

[paulDryzen]

Easy

add a multimatte for your carpeint material.
remove all color information from your elements comp with this mask.
add extra texture outputs for the fresnel amount of the clear coat etc.
take the MatlSelect layers and comp them on top using the extra tex element as a multiply for each MtlSelect layer like you do in your blend material.
Hope this helps.

Paul