OK. More stuff learned the hard way. Without being finished with my testing and still not getting what I expect from displacement maps, I appear to be getting somewhat closer to the answers I need. Since my scene is all scaled up by 10 times (everything parented to a single room figure), it appears I have to multiply my displacement limits by 10 times as well! I do not have the Global Coordinates check boxes set on my displacement shader nodes, but I've had to set my minimum displacement limit to 10.0 with comparably large values on individual objects in order to render the round sofa with polygon smoothing and without the displacement clipping render artifacts. I still can't see any effect from the displacement shader itself yet, so I'm going to try boosting the scale of that next. This is getting painful. Flexible, I'll grant you, but painful nevertheless :-)

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