This is a closeup of the elbow. I can see a tiny bit of displacement, but it's as it should be - nothing awesome or impressive, simply working as promised.

But how can you care about the displacement when the shape of the figure is so linear anyway? You should turn on polygon smoothing or sub-D or something. Otherwise, the increment provided by the displacement is overwhelmed by how wrong the shape is in the first place.

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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)