Could some one please explain why bitmap modeling isn't used more for 3D carving. I'm aware of only acouple of instances where bitmaps are used for carving. The now famious whiz kid "Carvewright" works totaly from bmp's.
Also there is Artcam and Enroute that uses bmp for background textures. Another program is "Photo V Carve" supported by Vetric. It seems to be limited to shallow rendering. In this process the darker parts of the images are deepest areas carved. So my question is, what are the drawbacks.
It seems much easier to scan and cut rather than building a mesh model.