There is now a way to display stereoscopic images in AltspaceVR. This only works in the VR headset version, not on the 2D desktop version.
Jim_in_Nj’s Universe > Star Trek: The Viewmaster Experience
Mrpete’s original world > 3D videos and photos
Jim_in_Nj’s Universe > Old-Time Stereo Theater
Dave’s Universe > MacroPhant2
Note: the pictures on the ground are phantograms, which do work well in VR
