How can I render mattes for materials that use poly selectio

[granthoki]

I have a model with several materials applied using poly selections. I don't need a matte for the entire model, just two of the materials. Is it possible to kick out mattes this way?

[bepeg4d]

Hi,
have a look here:
viewtopic.php?f=9&t=62462&p=319218&hili ... or#p319218
ciao Beppe

[granthoki]

Thanks for the reply! I'm a little confused with the technique you linked to. The object tag sees the object as a whole, while I need mattes for different textures assigned with poly selections on the same object.

[bepeg4d]

Hi,
sorry, my fault, didn’t read too carefully.
In this case, a solution is to create a take with all diffuse materials, and assign a glossy with Index 8 to the poly selection, then use the Material passes like Material Reflection,mor IOR, to obtain the mask:

You can use different IOR settings to obtain more than one gray selection.
ciao Beppe

[ceen]

Hi,

did something change here n the last releases? Is it possible to make a multipass mask from poly selections?

[aoktar]

Hi,

did something change here n the last releases? Is it possible to make a multipass mask from poly selections?

what's up with material masks?

[ceen]

Hi,

did something change here n the last releases? Is it possible to make a multipass mask from poly selections?

what's up with material masks?

You mean MatID? BW masks are a bit easier to handle. More clean sometimes.

[bepeg4d]

Hi,
for Polygon Selection mask, you can use the CryptoMaterialPinName pass:

ciao Beppe

[ceen]

Hi,
for Polygon Selection mask, you can use the CryptoMaterialPinName pass:

2ED10AE0-7A1A-4D50-8218-E5B4C1E2290C.jpeg

ciao Beppe

Awesome. Thx!