Thanks for making Sverchok.
After thinking about this idea for a long time, I finally started this project.
I thought it was possible to do camera matching with sverchok, just like in fSpy …, but then two sliders for each vertex (x and y). Twelve (edit must be 24) sliders for six segments. It takes a long time to match. 
Is it possible to create a Node that acts like a touchpad, so you can move in X and Y direction at the same time? Interactive points would be great, but probably impossible to implement?
Now for the first results. I am proud that it works and that it gives the same values as fSpy. But my nodes work is really messy and is an excellent example for spaghetti code 
. That needs to be worked on. I will also study Node Wrangler.
This was more of a test whether this could be done with Sverchok. So the answer is; “Yes”!.
Ultimately I want to have a camera matcher for 1 point perspective and 2 point perspective, because that is not available yet. That’s why I actually started this.
Image used: ( CC BY-SA 4.0) J. Hogenkamp Wikipedia
