Perspective Projection Drawing How to

I’m trying to create a Perspective Projection drawing like this one in Rhino 5:

I know it sounds a bit weird (it’s an assessment issue in my country (NZ)).
I’m basically trying to reverse enginieer the drawing in image D above out of a building model.

So far it all works fine. The only part I’m having difficulty with is setting up (image B). I have to set the vanishing points parallel to the edges of the building.

I’m using the 2 Point Perspective view (thanks for that by the way!)
I’ve set up a station point (using the ‘place camera and target’ tool)

I’m now trying to set up the viewport properties (particularly the lens length), but I don’t know what lens length to use to get the 90 degree viewing angle.

Is there a better (quicker =) way of doing this?

Hope that makes sense.

Have you played with Perspective Match?

Well, “lens length” is based on the diagonal of a 35mm film frame - 36mm x 24mm… It’s just a matter of drawing out the triangle and measuring the angle (or using a little trig)… A so-called “normal” lens is around 50mm, giving an angle (Field of view, FOV) of 46.8 degrees. So a 90 degree view angle is pretty “wide-angle”. Given that half of 90 deg. is 45 deg. and a 45 deg. triangle has equal legs, you can do the math with a calculator :

Diagonal of 24 x 36 frame: sqrt( 24^2 + 36^2) = ~43.267 mm
Lens length = diagonal/2 : ~21.63 mm

–Mitch