In addition to computing meshes ad-hoc and loading meshes from precomputed files, we also have the support to import STL files into a tracing view. The import handles two cases:

(1) Import an STL which was previously downloaded via webKnossos (that file encodes the segment id in the header and can be restored as if the mesh was just recomputed).
(2) Import an STL which was created by another program. For such an STL we have very little information (i.e., don't know which segment is represented).

For (2) we once built the feature to store the mesh on the back-end. Also, properties, such as the position and scale, of the mesh could be edited in the UI. This feature has always been kind of obscure and probably wasn't used much for that reason.

I noticed that the support for ordinary STL files is broken currently. Importing such an STL adds the mesh to the scene, but it's not listed in the sidebar. I couldn't find my dummy files in the scene, so I'm not even sure, there are rendered properly.

We should discuss whether the support for persisted and "ordinary" STL should be repaired or simply removed. I'd vote for the latter.

Remove in:

• frontend
• backend