This is an ongoing project that i've been working on to see the potential of interactive stereoscopic installations in examining the perceptual process. I use a setup that i've called a Diplopiascope to investigate this. The Diplopiascope has gone through a few changes but basically it is a stereoscopic viewer that allows the viewer to control the images they are being shown through an analog device.
How does it work?
Stereopsis is the perception of depth through an object being seen with both eyes. Due to the horizontal separation of the eyes, two slightly different views of the same scene are shown to each retina. This information, along with several other cues, is used by the brain to calculate depth.
This effect is simulated in the Diplopiascope by presenting stereoscopic films or images to the left and right eyes via projectors or monitors. The viewer is seated and views the images simultaneously through a mirrored viewing device.
I was interested to see what happens when we present different views to each eye at the same time. This is called binocular rivalry. What happens if we show the same scene at different times? What about greatly different viewpoints of the same object? What if the viewer is put in control of what they see through some physical controls?
This tutorial is more a guide to making the viewing apparatus for experimentation than a physiological explanation of stereopsis itself, and it doesn't go into much detail about how to make stereoscopic films as there is already lots of great information about this online.
Here are two videos of the Diplopiascope being used. The designs are slightly different but the idea is the same.