There's a program called fSpy in which you can draw lines on an image, and it will in turn give you a camera position and rotation, however it doesn't seem to work with orthographic images.
I have an image I want to recreate to scale, but it's in a trimetric view, I know all the angles to it, but it requires a lot of math to set up the camera and I don't think I'm able experienced enough to figure it out on my own. I tried eyeballing it, and while I can get close enough, I'd rather get it as close to perfection as I can. Is there some easy math algorithm or software feature that I can use to set up the camera? Thank you.