First off, this may not be the right group, however, it is the closest one I can think of.
I took a few pictures of a computer panel at a known distance, but the angle to a corner would require the use of the 3D Pythagoras theorem (√(x^2 + y^2 + z^2)) See Pythagoras theorem in 3D.
So my questions are thus:
- What is the first step?
- Will this be possible instead of measuring EVERYTHING?
Pictures will be attached: