...distinct from volumetric displays which support multiple simultaneous viewers so need to actually render in terms of voxels. Combining that with tracking de

...distinct from volumetric displays which support multiple simultaneous viewers so need to actually render in terms of voxels. Combining that with tracking depth cameras and sharing the map of the environment over the network would let multiple co-located users see and interact with the same 3D object (much like with a volumetric display) but the actual rendering of each user's view is decoupled. Combining this with eye-tracking, as \hyp0 mentions, takes this to the limit - you don't need to construct a "holographic display" that renders super high resolution light fields of rays in controllable directions to all the infinite possible viewpoints around the display. Instead just stick it on your head, locate the users in a shared depth map, and just render the slice of that their eye needs to see right now. In terms of CPU/GPU/bandwidth issues it's much more plausible with today's technologies. The display side is still challenging!