Overview of aPMatte, a Blinkscript based Nuke gizmo I made to generate a matte of different shapes, based on a Position pass, on your GPU. Includes options to transform the mask and change its falloff. Also has the option to output or overlay a P-based 3D noise.
Available on Nukepedia:
UI inspired by:
Noise adapted from:
Useful Expression node tutorial for those of you who want to understand the basics of P matte extraction: