aPMatte v1.0 – Nuke Gizmo for Generating Mattes From a Position Pass
aPMatte v1.0 is a gizmo by Adrian Pueyo. Based off of similar position matte tools, aPMatte can generate spheres, cubes, or ramps with falloff adjustments. It also allows for a 4D noise overlay with relative positioning to allow the noise to follow the mask. Pmatte is one of those must-have nuke tools and this may be another to add to the belt.
It is GPU accelerated and you can grab it on nukepedia.