Unable to scroll when loading segmentation

fedorov · May 31, 2019, 10:11pm

I see that users loading segmentations without the corresponding image volume get confused, because it is impossible to scroll through the segmentation volume. Is there a good reason to have this behavior?

pieper · May 31, 2019, 10:50pm

Probably because segmentations are not being taken into account when determining the extent/spacing of the slice view UI (e.g. the slider and the scroll wheel). Probably would be best to generalize the slice viewers so that any displayable node in the slice view can report a preferred bounds and spacing and not just volumes.

github.com

Slicer/Slicer/blob/808ec7020d4ac31556bf6c7df3566d11777335ae/Libs/MRML/Logic/vtkMRMLSliceLogic.h#L196-L208




///
/// Get the spacing of the volume, transformed to slice space
/// - to be used, for example, to set the slice increment for stepping a single
///   voxel relative to the current slice view
double *GetVolumeSliceSpacing(vtkMRMLVolumeNode *volumeNode);


///
/// Get the min/max bounds of the volume
/// - note these are not translated by the current slice offset so they can
///   be used to calculate the range (e.g. of a slider) that operates in slice space
void GetVolumeSliceBounds(vtkMRMLVolumeNode *volumeNode, double sliceBounds[6]);

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Unable to scroll when loading segmentation

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