Interesting, but doesn't work very well for me... Using all default options, it took 45 minutes to generate this... mainly magenta image (here I post only a thumbnail, initial image was 1920x1080). Looking at it in Photoshop, the green layer is completely black, explaining the magenta hue. I then tried to change renderer from "cycles" to "blender render" and this time got a B/W shadow image (in a few seconds). And I found no way to change the viewpoint (camera position). I guess I'll find it easily in some tutorial, but I would have thought that it would be easier to find. I HATE Blender UI...
If someone has an idea about the weird colors I get...
If someone has an idea about the weird colors I get...