Directus 3D Model Viewer
This extension embeds <model-viewer> into Directus as interface, display, panel andf endpoint (for use with live previews). These extensions will all render a 3d model in various places of the Directus UI.
All of the extensions expect the 3d model files to be uploaded to the Directus File storage.
Note: I've only tested this with *.glb 3d files! It may work with other formats but no guarantees.