Thank you for all help. I converted the photo first. A small program does it. Also some free program generate gcode from stl.
the photoconverter is here..
http://www.ransen.com/PhotoToMesh/Default.htmActually more program fund on the web. Most of them $30-40. My concern with 3d toolpathing, very timeconsuming. Assuming 1/4
balllnose, with 0.025 stepover. Can be compared to a larger ballnose about 2-2.5 dia, and average passwidth is 0.75-1 inch.
Counting on a shopbot, and 300 ipm for finish, the different can be seen of comparing the 0.025 stepover in case finish, with 0.75 stepover in case a vcarving method.
What i fund interesting, the method as ucancam generate the conturlines.
Thank you again to taking time.