If you have been following my experiments with sphere shading, you'll see that this is a more realistic model than the hack used in https://scratch.mit.edu/projects/114616806/. (This is very much a work in progress...)
frames extacted using avconv from: http://peterscarfe.com/rotatinglightsourcedemo.html I had to convert to greyscale and stretch the contrast - not entirely successfully ... only some subset of the frames converted OK... convert sphere100.png -crop 440x440+420+140 -linear-stretch 1x1 -colorspace Rec709Luma -contrast-stretch 15% -alp\ ha copy -channel alpha -negate +channel -fx '#000' bw100.png Animation speed is somewhat arbitrary at the moment.
