Update: I was overstating when I said you couldn't even have them in the
same scene together. I had saved the first scene, then altered the mesh and
saved it as a different file. when I made the csg, it corrupted both files.
Today I opened the first file (recovered from its .bak file), and combined
the mesh and heightfield as a group. This caused no problems at all. What is
the difference between a group and a union? When I look at the .pov file, it
doesn't call it a group; it calls it a union.
Steve Shelby

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