but isn't it true that if you considered the point to be a light source and triangle surfaces to emit light in all directions, then this boils down to well known radiosity calculations?
In other words if you stand in a non-convex room that is painted pure white, and turn the light on that every surface in that room will be illuminated, wheras anything outside won't be. (assuming the light is bright enough).
and even if you place any sort of geometry in this room the light will still reach even the most hidden/smallest triangle by bouncing off of other surfaces.
would this statement be true?