Viewing orthogonal planes at same time

[K-Meech]

Some users find it useful to view all orthogonal planes to decide on a target plane.
Perhaps we could provide an option to show this at the sides / or to easily switch the main viewer between different views.

[tischi]

Hey Guys,
@NicoKiaru @maarzt
Do you maybe have code to show orthogonal planes in BDV?

[NicoKiaru]

One way of doing it in bdv-playground:

https://github.com/bigdataviewer/bigdataviewer-playground/blob/master/src/main/java/sc/fiji/bdvpg/bdv/navigate/ViewerOrthoSyncStarter.java

For a crosshair overlay:

https://github.com/bigdataviewer/bigdataviewer-playground/blob/eec2c0eecb58c9205ef5d547722974cf33b45711/src/main/java/sc/fiji/bdvpg/scijava/command/bdv/BdvOrthoWindowCreatorCommand.java#L127

[K-Meech]

Great! Thanks @tischi @NicoKiaru for the suggestions - I'll take a look.