Material ID trough glass?

[Micha]

Hi,

at the moment I render watches and want to get masks for the materials behind the glass. Is there a simple way to get it working? If not, please set it on the wish list.

Best-
Micha

[renee81]

Big PLUS for that,I need that very often,and do the render twice so I can get the mat ID

Renee

[skysurfer]

Does the alpha contribution might help you?

[renee81]

not in my case

[Micha]

No, helps not. I found a solution per trick, but I hope there will be an official solution. Could be there one, please?

[fpedrogo]

Hi Micha
What about if you create a custom channel for that material, Then you can use that channel as the material ID for that material.

Best

[renee81]

Fernando,

Can you explain please how to use those custom channels?There is some also for the lights,but it is not clear to me how to use them.

Thank You

Renee

[Micha]

Fernando, thank you for the hint. So you mean I get the rendered parts cutout at the extra channel or is there a trick to get a mask on this way.