operator [] method
Returns a reference
Note: the memory of returned VecPoint3f is owned by this VecVecPoint3f, explicitly call VecPoint3f.clone if the parent VecVecPoint3f may be disposed.
Implementation
@override
VecPoint3f operator [](int idx) =>
VecPoint3f.fromPointer(ccore.std_VecVecPoint3f_get_p(ptr, idx), attach: false);