Merge topic 'fix_interactive_volume_issues'

f95de304 Updated test to new ivar to turn off auto adjust sample distance
20b2a4a9 Added alternate baseline with jitter for GL2
5df033ab Fixed ReductionFactor not initialized that was causing tests to hangup
a5890e69 Fixed styles and added notes
5282543e Merge branch 'paraview_volume_issue' into fix_interactive_volume_issues
938c8790 Fixed issues with interactive volume rendering
9b2883aa Improve documentation of new variable in vtkSmartVolumeMapper
40ec94e5 Interactively adjust sample distance for vtkSmartVolumeMapper
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Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Sankhesh Jhaveri <sankhesh.jhaveri@kitware.com>
Merge-request: !430