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Is it possible to exclude world from material id color aov? I cannot use alpha to cut it out because this is antialiased and white world color bleeds into other id's

Are you looking of an object mask for composing ? You should use OBJECT_ID_MASK AOV

Not object mask. I'm strictly using only material color id masks, because I can use this to create perfect rgb masks. Other ID masks use some weird hacks in Blender to create anti aliasing and what else.

Altough cryptomatte integration could solve all these problems *wink *wink Could even create a bounty for it

Egert_Kanep wrote: ↑Wed Oct 23, 2019 2:05 pm Not object mask. I'm strictly using only material color id masks, because I can use this to create perfect rgb masks. Other ID masks use some weird hacks in Blender to create anti aliasing and what else.

So MATERIAL_ID_MASK AOV is probably what you are looking for However you can get only one out of a single rendering.

Back to your original question: why background is a problem ? Isn't the same on the borderline of 2 different materials ? Do you just need a black background ?

Egert_Kanep wrote: ↑Wed Oct 23, 2019 2:05 pm Altough cryptomatte integration could solve all these problems *wink *wink Could even create a bounty for it

Cryptomatte support is something worth adding.

Background should be black, yes. If I only use pure rgb colors in MATERIAL_ID_MASK AOV I get clean masks. White is problem because that contains all full rgb values, black doesn't and won't mess up the masks

Ok, I changed object and material ID for background to 0 (from 0xffffffff, aka white).

That's awesome news