It looks like LuxCore is currently hardcoded to always use the loop opensubdiv scheme: https://github.com/LuxCoreRender/LuxCore/blob/e54bcf3ffb7feac5964e023c19ca3e7c4b98f530/src/slg/shapes/subdiv.cpp#L156 It would be nice to have the option to make use of the other available opensubdiv schemes as well (CatMark in particular): https://github.com/PixarAnimationStudios/OpenSubdiv/blob/ff76e0f2dc9c9202b7d2f965f264bfd6f41866d5/opensubdiv/sdc/types.h#L37