Cryptomatter and refraction

[Mikhalenko]

Hi, Any chance to make cryptomatte work with refraction? Or can I make some object invisible for cryptomatte only, but the will be rendered as usual and appear in other render elements?

[hermit.crab]

Sorry to say, no. There is a written comparison with the MultiMatteRE in the technical documentation here. You may try setting the refractive materials to affect all channels and use a MultiMatte for the objects behind those materials.