@David, I'm trying hard but it's still unclear to me. For example if I take the first image I posted above and try to apply more perspective, the location is completely screwed up. Starting from the general view I posted just above, what operating mode would you suggest to do a similar image as Buddhi's one (the 2nd one) ?

Ah, I think I understand your problem - I assume you positioned things using UF's standard zooming ? If doing that you change UF's centre from (0,0) then it causes problems setting positions up using the formula parameters. Ideally you should get the image set up as best you can with UF's location fixed and only change the magnification value and the formula parameters to set the position and distance etc. If you change the UF location so it's not centred then any changes you make to the formula parameters will always completely change the view.

So if you want to start from the image you posted then the first thing to do is reset UF's in-built center to (0,0) then use the formula target/distance/rotation to get a similar view to what you started with. As I said above a trick you can use here is set the "Camera distance" to a very small value, that way the target location is effectively the camera location. Obviously you can set a camera location then use "explore" on the camera rotation to point it in the correct direction.

Note that a trick to find the x,y,z value for a given location is make sure UF centre is zero with magnification 1 and the camera target is (0,0,0) with a normal camera distance, say 4 or more, then set the formula to "parallel" instead of "perspective" and view at (0,0) camera rotation and UF's x,y coords are the 3D x,y coords, then rotate the camera 90 degrees (direction not elevation) and you then have UF's 2D coords as the 3D z,y coords (or -z,y).

It's best to completely use the formula parameters for setting up positions, just changing the UF magnification until you're very close to what you want and then finally use UF's zoombox to relocate/frame exactly as you want things at the end.