"Content creators will be able to use the Source 2 game engine, the same engine that Valve uses to create its own games and experiences, to create and share their own worlds with the VR community using the Destinations Workshop," Valve wrote. At launch, the toolkit also comes with some example scenes created with photogrammetry — the process of reconstructing 3D spaces from photographs.
The Destinations are viewable in any headset supported by Valve's own OpenVR platform like the HTC Vive or Oculus Rift. And, for input, the Destinations Viewer is compatible with motion-tracked or analog controllers. The Destinations Workshop is available now in beta form on Steam's Early Access.