Adersh Balachandran

Hi everyone, I tried the above methods on Houdini 20 and karma and it still didn't work for me, So anyways I kept those setting as above and took a render and brought my karma render into nuke, and began to inspect the metadata for the crypto matte exr file. I had one previous working crypto matte file from another render that was working ( Renderman R25 ) and began to compare the metadata values.

I noticed that the " exr/cryptomatte/9171e81/name " key was not present on the karma render. From there it was easy

I added a ModifyMetaData node and added the key as " exr/cryptomatte/9171e81/name " and gave the layer name " CryptoMaterials " as a value. It can be based on any form of crypto matte based on object/primitive, kind, materials, etc.

After that, the crypto matte plugin began to work like a charm.

Thanks and Cheers