You misunderstand. In the script, I evaluated the planar projection and then wrote explicit UV's that implement that projection into the OBJ file. These concepts of UV projection mode and so on are only meaningful while I'm in the scripting environment, dealing with the geometry in the object-oriented system. When I call "WriteOBJ" on the object, it becomes a totally standard OBJ file with no magic at all.

Many of your responses and issues about compatibility with different apps seem to be all driven from this single mistaken premise - that the high-level features, like Level of Detail, like UV projection modes, etc. are lost if you target this app or that app. No they're not. Once I create the loadable prop, all those options are gone. I can create a new prop that expresses variations on those options, but Poser or Maya or whatever will never see those except as explicit frozen OBJ files with explicit topology, explicit vertex positions, and explicit UV values.

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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)