I think floor materials will be really popular, and so a simple UV-mapped plane. However, to preview it nicely, we'd want one or two walls and some windows for it to reflect, and maybe a little bit of furniture resting on it.

But it all needs to be simple. My goal is to integrate these material preview scenes directly into the LuxPose GUI, and to call (invisibly) LuxRender to preview render the material. The GUI will render using very fast settings, probably only one bounce, and then grab the PNG to show you how it looks. The goal is to get a first-pass render in 5 seconds or less. If you keep watching, it will keep getting better, but the first pass needs to be quick. So the demo scene needs to be carefully designed to be fast. I know you're aware of how to do this already - you showed us some low number of bounces that still looked good.

We can't use direct lighting only for this, because then we won't see reflections. But one extra bounce should be good enough to give an idea of how it will reflect the rest of the scene.

I'm thinking that a wall behind the floor could just be "painted" to look like windows using a color map and a transmap. And then another plane behind it with a fixed outdoor scene applied as a color map.

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