Change to display volume surfaces broke AEVA widgets
Aeva is no longer able to show data for its image 3D widgets, after !2682 (merged) was added to SMTK.
Load either dataset in "aeva-session/data/itk/" and select the "scalars" volume, click the 3-slice toolbar button. Nothing is shown. Expect a 3-slice widget to show with draggable slice planes.