Learn the Cross-eye Free-viewing Technique

Unless otherwise stated all the stereoscopic still image pairs embedded in the course web pages are designed for cross-eye free-viewing.   There is an alternative free viewing method called wall-eye or parallel free-viewing, however most people find the cross-eye technique easier to use.

You will most likely experience some eye-strain when first learning the technique, however over time the muscles controlling the vergence of your eyes will become strengthened and you will be able to free view for longer periods of time without feeling undue strain.

Mastering the art of free-viewing will make it possible to easily view full color stereoscopic images without the need for glasses or a stereoscope.  YouTube provides a cross-eye free-view mode in its stereoscopic settings.

Following are two excellent movie tutorials on learning the cross-eye free-viewing technique. The first is created in a delightfully campy and surreal form of machinima-like animation that Terry Hor apparently created with Second Life cosplay models referencing the Vocaloid characters, Hatsune Miku (with Red rather than Cyan hair in an oblique reference to anaglyph 3D), and Kagamine Rin (both voiced by Rikki-an Quiapon in this video).  The tutorial includes a very useful technique of raising the hands in front of the face to block the double image on either side of the fused image –a technique I had not used prior to watching the video, and subsequently have come to rely upon.  The piece also includes some mathematical formulae recommending optimum free-viewing distances.

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The quest for comfortable glasses free 3D continues to drive innovation.  The following technique does not appear to meet the comfort criteria –and is a great spoof of the notion that glasses are a restrictive encumbrance:

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