Image carving

JGCGen now includes rudimentary support for heightmap carving. You can see the first test carving below. (source)

 Currently only a simple scanning style toolpath generation strategy is implemented, but different methods can be added easily.
Current limitations are:

• No interpolation. The minimum stepover is image width or height divided by target width or height. This results in the striated look visible in the above image. A workaround is to use a higher resolution image.
• Single pass only. This limits the depth of the image to the maximum depth your bit can handle.

My current plan is to add a strategy for a roughing pass that can be run with a bigger bit before running the finishing pass.