Quote - Then, one could postulate that those values .707107 of N's x and z, and for that matter y could be input dynamically?

Actually, yes. I can calculate the effective illumination that would be produced using any imaginary function for the light source I would like. I can generate the math for 100 point lights, or an area light, or all sorts of things.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)