Improve SceneWindow usability when used in silx view as 3D array viewer

[t20100]

Usability of it in this specific case can be improved:

• Add a way to set plan // to each axis rather than editing the plane equation.
• Open tree when loading, eventually not displaying part of it (through proxy model)
• Improve selection of plane to pan (actually need to select the plane in the parameter tree).. maybe select this mode when the plane is made visible, or use an icon in the tool bar to toggle plane interaction.

[vincefn]

Nice to be able to see the complex data ! Some suggestions:

• rename the type of display from 'Absolute' to 'Amplitude'
• it may be better to initially display the amplitude by default
• the option 'Values<=min' works nicely, but it would be good if it was instead 'amplitude<=min' (I'm aware that may be tricky), especially for the phase
• I'm not sure the Iso-surface of the phase data will be used a lot but it could be good to mask the values where the amplitude is below a threshold. Of course that's less important than the phase colouring of the amplitude iso-surface
• crazy idea: it could be interesting to be able to shrink an iso-surface by a few pixels (especially for the phase colouring of the iso-surface)

[t20100]

Thanks for the feedbacks!

[t20100]

After PR #2523 gets merged, it remains:

• eventually not displaying part of the proxy model (through proxy model)
• the option 'Values<=min' works nicely, but it would be good if it was instead 'amplitude<=min' (I'm aware that may be tricky), especially for the phase
• I'm not sure the Iso-surface of the phase data will be used a lot but it could be good to mask the values where the amplitude is below a threshold. Of course that's less important than the phase colouring of the amplitude iso-surface
• crazy idea: it could be interesting to be able to shrink an iso-surface by a few pixels (especially for the phase colouring of the iso-surface)