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When you normally look at objects, your two eyes see slightly
different images (because they are located at different viewpoints).
Your brain puts the images together to generate a stereoscopic
viewpoint. When generating a single image for the computer display,
the default calculations (mode Stereo Off) assume there is
one eye centered
between where two eyes would be. Sometimes, as when generating ray
tracing input files,
the left and right eye
views need to be generated independently. Choosing mode Left produces
the left eye viewpoint, while Right produces the right eye viewpoint.