No default __reduce__ due to non-trivial __cinit__

[changhaowang]

Hi, thank you for providing this amazing project for us. It works well for most of the scenarios that I tested.

Recently I encountered a problem when I tried to use the python multiprocessing toolbox (passed in a fcl collision object as input). It throws me an error: no default __reduce__ due to non-trivial __cinit__. Do you know to add the additional __reduce__ method to the cython class? Thank you very much for your help.

[oisinturbitt]

Hi,

I am also running into this issue when I try to pickle a BVHModel object and would love to know if anyone knows an answer to this issue. Thanks a million for the library!