Hello. I'm Japanese student.

Can the projection model used in pov-ray be expressed by some equation?

For example, this is the perspective projection conversion formula used in
OpenCV.(It is in "Detailed Description" in the page.)

https://docs.opencv.org/4.1.1/d9/d0c/group__calib3d.html

If you can formulate the ultra wide angle model, fisheye model, or basic
perspection model used in pov-ray, I would like to know the formula. Also, if
there is something that should be referred to in that regard, please let me
know.

I'm sorry in my very poor English.

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