What am I doing now?

1. Segment the image.
2. For each region, get a better connected skeleton.
3. Normalize.(0 ~1 from boundary to skeleton)
4. Choose a function for popuping.(y = sqrt(1-x * x) * scale or else)
5. Do the relaxation and also keep the values from 4.
6. Do the light calculation.
7. Perturb the normal based on chosen textures(based on bump surface).
8. Find the ETF and trace the streamline for high frequency areas.
9. For each found streamline, popup it up as a line or popup it up as a stroke.

No good results come out yet. Later soon....