Nomenclature: Some back-side issues

[gzotti]

Observing the Moon, I see some nomenclature labels for features on its far side: e.g. Mare Moscoviense, Tereshkova, Titov, Komarov, Dorsum Azara, etc.

Maybe a better solution than distance testing would be normal vector testing, whether the feature "points" into the observer's hemisphere. Should work also for most 3D bodies.

[Alexander Wolf (alexwolf)]

Georg, are you seen it after my patches and optimizations (r9848)?

[gzotti (georg-zotti)]

Indeed, I checked with the "merge" revision, seems better now.
But I cannot select some labeled features now, i.e. the Moon gets selected when I click on them. On the other hand, I clicked on (unlabelled) Messier and it was selected. I think visible NomenclatureItems should also be selected when clicked reasonably close to the marker ring. Click on hidden items may select them or the Moon, depending on distance.

[Alexander Wolf (alexwolf)]

Please see NomenclatureItem::getSelectPriority() method - I've added very simple filter for "selector". What about original bug report?

[gzotti (georg-zotti)]

Examples: with FoV 0.208°, Center on Dorsum Cushman (in Mare Fecunditatis, near Messier). Try to select visible labels for craters Gutenberg, Goclenius, Maclaurin, Taruntius, Maraldi D, ..., all select the Moon.

Zoom in 3 mousewheel steps to 0.126°, Click on unlabeled Messier or Messier A. It will be selected.

[gzotti (georg-zotti)]

OK, I have not seen the back-side issue with r9848. Also checked with Mars, no problem.