I downloaded Rhino 7 (eval) in order to run a very simple mesh measurement protocol that I wrote using Rhino 6 a couple of years ago. The protocol is for measurement of lines defined by a mesh.
I used to use the Perp Osnap tool to make a polyline that originates from a point on the object and perpendicularly intersected a preciously drawn line (blue, see photo). It would snap to be perpendicular to the 3D line in the top view, sort of like the red line. However, the “Perp” snap appears as the selected line, which is not perpendicular in the top view.
Instead, it seems to be perpendicular in the Right view:
Here is how I did it before:
Is there a way to make the line snap perpendicularly in the Top view?