Zorro is a Windows tool, I created with openFrameworks.
It allows to draw arbitrary vector shapes to use as masks in projection mapping.
– You mirror your desktop with Zorro opened in full screen on to your projector.
– Then you create as many shapes with as many control points as you need.
– You can also blur single shapes for soft edges.
– Afterwards you save the mask as a png and import it into your media server / VJ software.