operator [] method
Implementation
@override
VecPoint3f operator [](int idx) => VecPoint3f.fromPointer(ccore.std_VecVecPoint3f_get_p(ptr, idx), false);
@override
VecPoint3f operator [](int idx) => VecPoint3f.fromPointer(ccore.std_VecVecPoint3f_get_p(ptr, idx), false);