Types of 3D displays
in (roughly) increasing order of difficulty.
Included are the depths cues associated
with each type, beyond binocular disparity (which all provide).
stereoscopic
2 views; needs viewing aid: stereoscope or glasses
methods: polarized, anaglyph, time-multiplexed
cues: maybe motion parallax if viewer is tracked
autostereoscopic
two or more views, or continuous views
methods: parallax barrier, lenticular, moving slits, Integral photography
cues: limited motion parallax (if more than 2 views)
volumetric
light scattering from 3D points
methods: varifocal mirror, moving projection surfaces or emissive surfaces
cues: motion parallax, accommodation, convergence,
but NO occlusion or specular reflections
holographic
3D images
method: diffraction of light by a computed holographic "fringe" pattern
provides all of the depth cues!