UV and Object ID’s

[Mohamed Selim]

Hi,

I’m fairly new to Nuke, so bare with me..

I have a 4 sec exr CG shot with embedded passes like shadows, spec, etc i also have a UV pass and Object IDs for a couple of screen replacements.

In Fusion you can assign anything to and object ID through picking the colors on them, i cant find a similar or any way to do the same in Nuke. I tried the Stmap node and showed it the UV channel and gave it a color bar as the source so it layed the thing to the whole scene…now how do i just limit that to a certain object ID like for example object ID 4 which is the middle screen.

Thanks.

[ali read]

I can’t do it either, and I never used an object id pass cause somebody told me that the edges were a bit rusty.

I always try to use multimatte pass, Its very quick to render out.

😉

[Darryl Starr]

Hi,

When you say it’s easy, do you mean there is an automated way in render engines to generate these mattes?

[Ricardo Catena]

I think you have to do a quick key on the objectID pass and then use that as the mask to get what you want.

I think what zenerry is talking abut is a manual objectID/masking pass where you assign flat primary colors to your objects. (and you will be limited to 4 objects pr. layer/channel set/etc.)

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