Hi, I have a simple question for you. I would like to implement a concave mirror (or lens) with rectangular aperture in NSC mode (like the one I attached in this post). The rectangle must have a shape 25 cm x 25 cm, while the spherical part must have a radius of 40 cm.
Which object type should I use? (I already tried Standard Surface, but I cannot get the rectangular shape).
Thank you in advance.