ID channels in EXR

[simonreeves]

Hello,

I had an idea earlier and wondered if it was possible.

Basically I was thinking of an element like RenderID, but instead of assigning random colours to every object, it would be useful if it stuck to RGBA and just created loads of channels in a multichannel EXR.

ObjectID % 4

I'm referring to object render ID as that is the channel that currently exists that automatically makes IDs, I mostly just use material IDs and it might be good if that was possible too, auto material IDs


I suppose at the moment I could make a script that traverses all the materials in the scene, gives each one an ID, and creates loads of multimattes... (thinking aloud here)

[leufen]

Deep exr's works quite well for this, but may not always be a good option. You can access "auto"-renderIDs in regular exr's, but not with the nice sampling (i think).

Maybe check http://deex.info/wordpress2/tools/deex-vray-fast/ if i remember correctly there's some auto-multimatte scripts in there.

[bigbossfr]

If i remember they is an option to render renderID (or object ID) with integer value.

[simonreeves]

Maybe check http://deex.info/wordpress2/tools/deex-vray-fast/ if i remember correctly there's some auto-multimatte scripts in there.

Thanks for the suggestion but I don't want really want to use that massive tool when I just need this one task.

If i remember they is an option to render renderID (or object ID) with integer value.

In the params of the renderID element? There are no options, at least in 3.0

[leufen]

In the params of the renderID element? There are no options, at least in 3.0

It's in the "Image format options" for exr's.

[simonreeves]

OK thanks.

Well those are interesting options but don't really help.

In the mean time I have made a script that assigns material IDs to all of the materials in the scene, and creates all the multimatte elements needed so that might do the job for now.