I have a vague memory of that, but I can't bring to mind where I saw it. Do you have a link?Someone had a proof of concept a while ago
Yous referring to SRB4?
That's not a proof of concept, that's just SteamVR Home but with SRB2 textures. SRB2 in VR would make you really motion-sick anyway since the max framerate is only 35fps while even the budget headsets run at at least 72, not to mention teleportation motion really wouldn't work and standard motion would probably make you motion sick with how fast it goes, even if it did manage whatever FPS your headset supports...