Nice! Just working on a projection mapping previs and I thought I’d have to resort to the Blender Render without all that raytracy goodness
With a little tweaking it’s possible to make the light act just like a projector.
To get the right aspect ratio I just put a 16:9 image in a square texture, to focus the image the light size has to be 0, to center the image X & Y mapping location has to be set to 0.5 and to avoid repetition I just turned on Min and Max in mapping. However I had to leave a little of black space around the image so it doesn’t get stretched out. Is it possible to change the way cycles clamps textures?
Anyway, thanks a lot for this!