Hi @Lalte.Ma.
I think that you’ve answered your own question. The link that you provide explains the two methods of either tilted surfaces or coordinate breaks.

If you could upload an example of what you’re working that presents the ray-trace problem, that would helpful.

If you are using the coordinate break method, then I think using ray-aiming is unavoidable.

Another thought is that with black box files, you may not know how or where to place the stop such that the file is usable. I would suggest placing the stop as an entrance pupil (the flying or floating stop method).

This means,

• placing a surface after the object that has a variable thickness.
• This surface proceeds to the stop.
• The stop’s thickness is then a pickup from the previous surface with a -1 multiplicative factor to undo the distance.

In this way you can dynamically move the entrance pupil around relative to the black box without having to know where the stop is located.

Finally, it might be worth noting some of the limitations of using black box files which includes the aforementioned issue with the stop, apertures, etc.

Hi @Michael.Young, 

thank you for your answer! I attatched a example archive. It is the setup i am working with right now. I also tried to use the CoordinateBreak and RayAiming way, described in the post but couldnt make it work with the given formulas for the pupil shift for large angles. Also the tilted surfaces approach basically stops working at one point. 

I will also try your suggested solution with the stop surface.