[Feature Request] Add support for overlapping segments

[fedorov]

What feature or change would you like to see made?

Overlapping DICOM SEG segments are currently no loaded with the error message indicating they are not supported in v3. Overlapping segments were supported in v2.

Why should we prioritize this feature?

IDC project is currently using v2, which is able to render overlapping segments. IDC contains data that contains overlapping segments, such as this one: https://viewer.imaging.datacommons.cancer.gov/viewer/1.3.6.1.4.1.32722.99.99.62087908186665265759322018723889952421. Unless this feature is implemented, this would be a regression if IDC switches to v3.

[igoroctaviano]

@sedghi @rodrigobasilio2022 will discuss a solution to this issue.
A stack viewport is being implemented and might address this issue.

[james-hanks]

@sedghi link stack segmentation ticket (if we have one)

[fedorov]

Per @rodrigobasilio2022 (if I understand correctly), this is blocked by cornerstonejs/cornerstone3D#679.

[rodrigobasilio2022]

Yes, the steps are:

• Finish this PR @ohif/extension-vtk: Update VTK extension #679;
• Add overlapping segmentations in a new PR;
• Implement the modifications in OHIF;

[igoroctaviano]

Related to #3581

[james-hanks]

On hold because related fix will be published through industry partner project Q1 2024