none :P, cube color is done by an rgb-join, and the shadows are textures that get streched. Note that the background is just a photo of the wall on witch i'm about to project it.

Cinema4D:

The shadows are rendered in Cinema4D, area shadows. Combined with heavy luminence on th bg and cubes I managed to get some nice shadowmaps for each cube. Then I cut those to peaces (8 for each cube, 4 corners and 4 sides).

VVVV:

Then in the composition I used some spreads to position the textured sprites around every square, and used the same multiplier as used for the cube color to strech them, so they resemble a somewhat correct shadow, based on the Lumince of the square. By using a spread as the multiplier (for instance an Audio FFT, or prebuild math loops) I made every square behave on its own.

Controls:

For this composition I use a Midi Controller (some faders and stuff) to be able to mix different effects over the panel. This version has a math loop combined with an Audio FFT.

Working on a far more complicated one (with much more 'cubes') and more complicated math patterns. :P