Cryptomatte node for SD?

[kirkr5689]

Wonder if anyone ever managed to do a node that extract masks  from a cryptomatte exr  rendered in 3d soft ?       Is it at all possible in SD? 

[Mark_Edwards]

Unless I misunderstand, can you not use one or more color to mask nodes to grab the matte you want?

[davescm]

The cryptomatte format uses both coloured masks and metadata to identify the masks. The coloured part is easy within Designer, I have not seen anything that would access the metadata.

Dave

[kirkr5689]

What I want is to get a proper masks with  accurate edges and gray values , not just  binary,    only cryptomatte exrs are providing.    For a smoke  for example .  Is  matadata necessary for this ?   Sorry, I don't undestand well enought how it works in compositing soft.