[HardyLeung]

Neat. I have a related project called Polygonian -- http://www.polygonian.com -- runs on browser and requires Chrome Native Client that does something similar. Here's the output of a Lincoln portrait using similar point count:

http://imgur.com/lpKVILV

[spydum]

seems like it's using gradients? for some reason looks less.. triagular that way

[HardyLeung]

Yes, linear gradient within each triangle. It has a non-gradient mode but not turned on. The difference is minor though: Gradient = more "silky" and less triangular. No gradient = a bit more flat.