Same shader, but now we're looking at the upper left corner. See the stripes? That's a math error in the node. There are other nodes that do this.

I tracked it down to this: Small scales and highly negative numbers - something goes bonkers. In this case, it's the negative X coordinates of all parts of the prop on the left side.

My workaround is to not let nodes like this use their own coordinate system. Instead, I extract the world coordinates using the P node, and I add a ton to them, like 5000 inches. This puts most props entirely into postive world coordinates, where the nodes generally behave themselves.

Such repairs and workarounds are only applicable on certain nodes. If you run into one, ask.

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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)