Object ID
You can use separate AOV passes to create masks for individual objects. In order to mark individual objects for these mask calculations, numbers can be assigned on this settings page, which can then be utilized via corresponding ObjectID or Puzzel Matte AOVs.
Activate this option to be able to give an individual ObjectID number to this object.
The number that you like to asign to this object. The same number can then be used for instance with ObjectID or Puzzle Matte AOVs to create masks for this object.