@freeze I wrote this a few years back which might give you a good starting point. https://plugins4d.com/Product/FunRay https://github.com/kentbarber/rtow4d Cheers, Kent

@ferdinand Thank you for replying!

@ferdinand Thank you for answering ,I 'll try it.

@ferdinand Thank you very much! The problem is solved and now I know the way of MODATA_CLONE used.

@ferdinand Thank you for the answer! The problem is solved after I try to find the child of the port according to your answer.