exploring lighting in jitter [part 1]

Lighting can get pretty confusing, pretty quickly. what started off as an exercise in trying to consolidate my knowledge about lighting has turned into this discussion and the accompanying patches. i’m publishing it here in the hope that it might be useful to those who are new to jitter.
exploring lighting in jitter [part 2] - using jit.gl.sketch
part 2 looks at how to make use of opengl lighting parameters using jit.gl.sketch, inputing the values via a command list.
