As for a patch, since I found that there is a problem with the conversion of sph (ell, hyp, etc): when the center of the implicit primitive is set a non-origin point, the result BREP is still centered at the origin. But that of many other primitives work well this way. So I'd like to fix this problem with sph, but I doubt whether I can finish it in a short time. Can you give me some advise?

It should be a quick and easy patch actually.  The code in question is in src/librt/primitives/sph/sph_brep.cpp and the code in src/librt/primitives/ell/ell_brep.cpp (or any of the other *_brep.cpp files) might help with that bug.

Cheers!
Sean

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