leader lines for technical illustration

 From:  pressure (PEER)
10993.1 
I've been experimenting with different styles of leader lines trying to find one that is as clear as possible about what it's pointing at in a perspective drawing while also distracting minimally from the perspective. The best I've come up with is a line that's normal to the surface and terminates at the surface in object space and then curves to be either vertical or horizontal in paper space:



I make these by drawing a little stub line normal to the surface in 3D, save as SVG, import the SVG back into MoI, trace over the stub with a polyline snapping to the end and then to horizontal or vertical, construct a constant distance fillet at the corner, and finally save as SVG again.

Does anyone have ideas for a different style of leader that's just as good, but easier to make, or an easier process for making this style?

- Peer
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