I did Floating Islands ten years ago. It's an old Bryce gag, later on Vue kicked in for the higher quality. It's just a simple (but high resolution!) mountain height-map upside down, and the square base plane cut off. That's why there aren't that many around.

In Poser, just take a grey-scale hight map and apply it as extreme displacement mapping. Or use a simple 3D package (or Bryce itself?) to export the displacement map as OBJ. Might get big though, given the resolution.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though