Volume masking "soft edge" option requires non-empty output volume

Support
1

This backtrace is obtained with ‘Mask volume’ effect while setting ‘Soft edge’ :

Traceback (most recent call last):
  File "/home/user/programs/Slicer/lib/Slicer-5.3/qt-scripted-modules/SegmentEditorEffects/SegmentEditorMaskVolumeEffect.py", line 323, in onApply
    SegmentEditorMaskVolumeEffect.maskVolumeWithSegment(segmentationNode, segmentID, operationMode, fillValues, inputVolume, outputVolume,
  File "/home/user/programs/Slicer/lib/Slicer-5.3/qt-scripted-modules/SegmentEditorEffects/SegmentEditorMaskVolumeEffect.py", line 435, in maskVolumeWithSegment
    outputArray = slicer.util.arrayFromVolume(outputVolumeNode)
  File "/home/user/programs/Slicer/bin/Python/slicer/util.py", line 1662, in arrayFromVolume
    nshape = tuple(reversed(volumeNode.GetImageData().GetDimensions()))
AttributeError: 'NoneType' object has no attribute 'GetDimensions'

To reproduce :

Start Slicer
Load CTA-cardio
Go to ‘Segment editor’
Create a segment
Paint at random
Switch to ‘Mask volume’ effect
Set ‘Soft edge’ parameter at 0.50
Select ‘Fill inside’
Apply

The ‘Wait’ mouse cursor runs for ever, a ‘Temporary volume mask’ volume is present.

It ‘Mask volume’ is applied without setting ‘Soft edge’, it completes normally. Subsequently, if ‘Soft edge’ is set to > 0.0, it completes as expected.

2

I cannot reproduce this issue.

Does it work well if you first run the effect without soft edge and then rerun with soft edge on the same output volume?

3

Yes, that’s the point.

A first run without ‘Soft edge’, and a next run with ‘Soft edge’ is OK.

A first run with ‘Soft edge’ hangs with the above description.

I’ll try again later on with my next build. It’s not a big issue, was just reporting.

P.S. : running on Linux, self built Slicer. Did not test yet with factory Slicer.

4

I’ve made the effect more robust, from tomorrow it should work now with any output volume.

5

Yep, now it works, thanks.

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