UV PAINT is a tool that translates the UV informations from a UV map directly into the xy space in the frame, in real time. Painting directly on the UV map you get the current strokes translated into the xy 2D space. In this way you can create a precise roto that will match the strokes on the UV map.
uv_paint
Updated: 19 October 2010
Author: angelo.perrotta
Compatible Nuke versions: 5.2 or later
Compatibility: Linux, Mac, Windows
How to: uvPaint takes only one input, the UV map.
Once you plugged you uv map, open the properties.
On the bottom left corner in the frame you should see a picker called "uvPicker". This is the tool to paint on the uv map. Move it whatever you want to paint on. Then press the "Draw" button to start to paint.
Now you can simply start to move the "uvPicker" to start to draw on your uv pass. One you release the mouse you get the update in the viewer of the translated strokes in the 2D space. You can temporaly stop to paint just pressing the "Stop" button. The you start to paint again with "draw".
Enjoy.
Angelo Perrotta.