You install the Vermillion Studio Workshop from your Steam library, and import a .gltf export of your model into it. You can then assign textures and material properties within the tool.

Hello thmvdberg, thank you so much for your quick answer, that was a big help. I have one more question, maybe you can answer it for me too, namely how can I convert a vpk file into a glb file. I downloaded vrf.exe as in the instructions but it doesn't work. Is there another way? I would like to thank you in advance for your great help, kind regards

Hmm, I can't help you there directly. Vpk files are Source files, not regular models. If you can export it as any model format, such as fbx, you can re-export it as a gltf from there using Blender for instance.

Thank you for your answer, I'll see if I can find out anything.

Do you want to make an environment from scratch? I experimented with https://www.livehome3d.com/ and exported simple environments I could load in SteamVR. I might be able to dig up more if that is the type of "environment" you meant. It can export glTF/GLB format but I think you need the pro edition for that. https://www.livehome3d.com/support/lh3d-win-help/en/working-with-projects-exporting-a-3d-model

Quick test bhttps://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3432037201

Also a Steam guide: SteamVR Home to Vermillion Studio