feat: Enhance vis.py show routine

[winksaville]

• Add parameters azimuth viewup and clipping_range to allow for improved control of the rendering.
• Always call ResetCamera early so the camera is in a known state before applying user defined parameters, some of which are relative.

[winksaville]

I've added this per the suggestion from @adam-urbanczyk in "Enhance show in vis.py" discussion #1844.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.77%. Comparing base (f07e7e0) to head (e4512c4).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1855      +/-   ##
==========================================
+ Coverage   95.66%   95.77%   +0.10%     
==========================================
  Files          28       29       +1     
  Lines        7431     7856     +425     
  Branches     1122     1183      +61     
==========================================
+ Hits         7109     7524     +415     
+ Misses        193      192       -1     
- Partials      129      140      +11     

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[winksaville]

Anyone have any thoughts on this PR?

[adam-urbanczyk]

Pls give it some time.

[winksaville]

I'm a neophyte at all this so I asked the bot1 and it says always calling ResetCamera like I did was wrong It's solution was:

# actors already added to ren
cam = ren.GetActiveCamera()

user_pose = any(p is not None for p in (position, focus, viewup, roll, elevation, azimuth))

if not user_pose:
    ren.ResetCamera()  # compute default pose + clipping range
else:
    if focus is not None:    cam.SetFocalPoint(*focus)
    if position is not None: cam.SetPosition(*position)
    if viewup is not None:   cam.SetViewUp(*viewup)
    if roll is not None:     cam.Roll(roll)
    if elevation is not None:cam.Elevation(elevation)
    if azimuth is not None:  cam.Azimuth(azimuth)
    if clipping_range is not None:
        cam.SetClippingRange(*clipping_range)
    else:
        ren.ResetCameraClippingRange()

renWin.Render()  # finalize sizes/ranges

The if statement double negative is odd and there are likely other issues, but the final call to renWin.Render() seems like a good idea.

I'd suggest asking for help on a VTK community forum and since this is well beyond my area of expertise I'll let you all decide how or whether to take this PR.

Wink