[Feature] - Cast client and hub

[mbellehumeur]

Motivation

This request relates to this vtk-js request: Kitware/vtk-js#3507.

It would be supported by two PRs:

PR #1 - Cast client:
The client PR would implements the vtk-js cast client in the VolView IO module and adds CastModule.vue to the ModulePanel.vue component.

PR #2 - Hub:
The 3D slicer cast_api.py script would be replicated to the VolView server folder. An additional server script would deliver the volview remote server and the hub endpoints on the same port.

The hub provides a test mock auth endpoint that provides a user id and auth code. A “single-user” mode is available for stand-alone applications that do not use authentication. In addition to FHIRcast events, the cast hub allows the following:

• Data formats other than FHIR, such as DICOM, PNG, NIFTi, openEHR, OpenIGTLink, nrrd,
• Query applications for information, such as worklist context, report content, DICOM instance, DICOM tag, JPEG/PNG screenshots, scene views, etc.
• Group topics for multi-user workflows, such as tumor boards or interventional procedures.
• Support three additional event level data: subscriber product name, version and IHE actor role.

[PaulHax]

Neato. Do you have links to the actual code. #1 is not this repo.

Do you see this as wrapper fuctionliaty for VolView/vtk.js? Perhaps a FHIRcast aware app should integrate VolView/vtk.js rather than VolView/vtk.js integrating FHIRcast?

Some prior art:
https://www.kitware.com/volview-insight-a-seamful-integration-for-clinical-ai/
https://www.kitware.com/integrating-nvidia-clara-models-into-volview-a-technical-deep-dive/

[PaulHax]

For VolView I'm interested in a generic way to update images, segmentations, and vector based tools (polygon/ruler/rectangle) that does not commit to a particular backend. Something like the server/ directory, but more a protocal than a library.

[mbellehumeur]

There is a couple videos in this project that may touch the topic of modifying objects (sharing an annotation and sceneview) : https://projectweek.na-mic.org/PW44_2026_GranCanaria/Projects/CastAStandardForRealTimeFrontEndIntegrationOfHealthcareApplication/.

[mbellehumeur]

For the PRs, I am waiting for the feature requests to be approved (vtk-js and volview repos) before I file them.