The one you linked here in the comments.

I think you might be talking about how the camera uses orthographic rendering? This article explains it well https://manual.keyshot.com/keyshot11/manual/cameras/lens-set...

	▲	hedgehog an hour ago \| parent [-]
		That's a good reference for what orthographic rendering is, but if you look at the rendered scene it's definitely not orthographic. Parallel lines in the model converge towards the camera when the model is viewed from an angle.