How do you take a screenshot that's exactly the size of a quad? (Assuming camera perfectly faces said quad - basically using quad to crop)
Problem is that screen resolutions change, but the mesh remains the same size. The example is shown in screen coordinates. How does that work for cropping from a mesh?
If you REALLY insist on perfectly calculating coordinates .... https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html