Cryptomatte including matte objects

[ali_cgi]

Hi is there any way to set cryptomatte so it doesnt render any parts that are matte surfaces.
Ie have the cryptomatte only contain things that are inside my alpha channel.
Thanks

[hermit.crab]

You may use the CryptomatteRE with its ID type set to 'Material name' and give your objects unique names (mattes would be ignored in this case) or you can assign custom user attributes to your objects and set the ID type to 'V-Ray user attribute', so as to render out the objects containing only the specific attribute (skip the matte objects in this case). Additional info available in the technical documentation here: https://docs.chaosgroup.com/display/...YA/Cryptomatte