As a corollary to all this, please see:
or contract it to the feature for V depth limiting in Vectric Vcarve.
It’s really interesting to compare the geometry one gets with a constant tool angle and the sort of continual change and consistent depth one gets with hand-carving — in particular, the depth of small, delicate areas will be much deeper with hand carving, and the corresponding shadow far darker. See Michael Harvey’s Creative Lettering Today for more on that.