As I wrote in a previous post, I'm on my way to learn forth, and to do so, rewrite my Lispy raytracer into a.. Forthy raytracer. Of course, the first steps are deciding on some implementation ideas.I decided to allocate a few global variables (for "current point", "current vector", "light source", etc), to avoid too much clutter in the stack. This way it will be cleaner, maybe even cleaner than