An implementation of the variational shape approximation method
./variational_bin smooth_bunny 180 0.3
Then press 'S' -> wait -> press 5 --> press 'L'
S: Iterate until convergence
L: hide/show edges
1: Hide mesh
2: Display mesh
3: One iteration (Region mapping + proxy fitting)
4: Draw anchors
5: Triangulate
6: Alternative triangulation coloring
7: Draw proxies
8: 10 iterations
9: 100 iterations
