Potential usability improvements

[LorenzLamm]

While going through a small dataset and annotating a couple of membranes, I encountered some minor issues. Fixing these could potentially improve usability of the software.

I'm collecting them here:

• Orientation deletion: After deleting points, corresponding orientation arrows are still in place (however, they are removed when clicking a new point). Can we delete points with orientation arrows together? (Update vectors when points are updated #36 )
• Moving points: When adjusting already placed points, they are not necessarily placed on the membrane surface. Would it make sense to also place them on the surface?
• when moving points, orientation arrows stay in the original position -- would be nice if they also moved with the points (Update vectors when points are updated #36 )
• When shifting the view (i.e. hold shift + drag), unwanted points are placed on the surface as well (because of the click). Can we deactivate point placement when holding shift?
• "Enable Picking" only instantiates new points / orientations the first time. If I delete them and want to start clicking again, it does not work (Improve initialization #37)
• Orientation arrow sometimes disappears within the membrane (in case of curvature I guess) —> maybe we can place it a bit further up (along the normal)?
• Shading should be „none“ by default. This improves appearance of the densities a lot (Improve initialization #37)
• For new picks: rotation slider should be reset to default. This would make it easier to interpret the slider value (Improve rotation slider UI #42 )

I didn't have the time yet to look into them, and don't know how easy each of them is, but happy to do it when I'm back from vacation.

[kevinyamauchi]

Thanks for posting these, @LorenzLamm ! I can pick at a few of them over the next week or two. I'll post here if/when I pick any up.