Quote - > Quote - Load a one-sided square. ...What is your theory?

The one-sided square prop is a single polygon, and it's a common thing in GI rendering in other apps that polygon density will affect accuracy of how GI is applied.  It has to do with the number of samples being allocated on a per-polygon basis.  I would expect a higher poly object of the same shape to behave differently (more accurately).  I'm not sure of the point you were trying to make, but this is still useful information even if it doesn't have to do with what you're getting at.

Now you seem combative. I dont' know why. If I do the same demonstration with a wall made of 10,000 polygons, does that change anything? Further, how does a denser set of vertices come into play, when simply duplicating the single polygon suddenly produced a completely different outcome?

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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)