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A simple and fast solution to Unwarp to UV space your CG render.

The Gizmo use a simple PositionToPoint node to redistribute each pixel in his UV space position. Works as the nuke default STMap but does exactly the opposite.

It can be used in many different ways, for example to know where to draw a roto in uv space, to be then distorted via STMap to mask a particular area of your CG render.

11-12-2014 – v1.0 – First Release Download

Or open lm_InverseSTMap_v1.0 in new Tab, copy all text and paste in your Nuke nodegraph.
Also available on Nukepedia