How to use my gizmo: ColorPickerID, available on Nukepedia.
1. Coverage Pass 00:08
2. Gizmo - ColorPickerID 00:37
3. Example1 04:17
4. Example2 with ObjectID in Arnold 05:44
With this gizmo you can pick colors for your matte (like in the Cryptomatte).
You can use also the Coverage Pass if you want.
Special Thanks to my teacher Matteo Corbi