...
edm:isShownBy is a direct link to a 3D file. If you provide a direct link (for example to an STL file) in edm:isShownBy, it is advisable to map a URL to your resource to edm:hasView as well. This will lead to a higher quality measurement in
content tiers . Please note Europeana website does not yet support the display of 3D objects when edm:isShownBy is a direct link to a 3D file.edm:isShownBy is a link to a webpage where the 3D object can be displayed and which can be mapped to an oEmbed URL. Europeana currently supports links to Sketchfab or the WEAVE viewer when they are provided as one of the following URL patterns:
...
Europeana applies an additional logic to convert the above URLs into an oEmbed URL that is used for embedding, meaning that 3D objects are displayed in the Europeana portal. So if you would like the user to interact with your content directly on the Europeana item page, you can use the SketchFab or Weave WEAVE viewer. More supported viewers and URL patterns are expected to be added in the future. If you have your own viewer, you can request your oEmbed-compliant viewer to be added to the internal registry of oEmbed endpoints that are supported by us. Please send a message to the 3D service desk and your request will be checked.
...
At the moment, there are no recommended formats yet. Any format that is visible in an embeddable (oEmbed) viewer (currently only Sketchfab or WEAVE are supported, but more will be in the future, and it is always possible to request if your own viewer can be embedded) should do, as well as direct links to your 3D content.
There are, however, formats that are well established within the 3D community and that we are considering supporting in the future. Multiple formats can already be found within the 3D content published on the Europeana website, such as DAE, PLY, WRL, GLTF (via embedded SketchFab viewer), and OBJ. Other options can, for example, be STL, NXS (NXZ), DICOM, IFC or USDZ. The selected format may of course depend upon the requirements you have for your 3D collections, and the use case you have in mind.
...