Tutorial: "Cross-eyed" view of stereoscopic 3D video clips on YouTube

 

To watch a stereoscopic 3D clip on YouTube you don’t necessarily need special glasses.

Go to a stereoscopic 3D video on YouTube such as this one.

Click on “3D” at the bottom of the YouTube media player window

select “Change viewing method”

Select “No glasses”

 

Select “Cross-eyed”

The media player now displays the video as full side by side, with Left View on the right, Right View on the left.

 

For Cross-eyed viewing, try this simple method:

Holding your index finger vertical near the image plane.

Focusing on the finger draw it back towards your nose.

In your peripheral vision notice the two images in the background move, and another 2 images are formed.

When they align they create a 3^rd image in the centre which is 3D.

Slowly remove your finger from your field of vision, while keeping the middle two images aligned.

Keep your focus on the overlapped left/right image in the centre.

I find focus seems to snap into place when you are close.

If you have problems locking on to the centre 3D image, try leaving your finger between your eyes and the image plane, but still focusing on the centre image.

If at first you fail, relax, rest your eyes, and try again later.

 

DISTANCE FROM THE SCREEN

For the YouTube media player window expanded to full screen, here’s a guide on distances that work for me:

 

15.6” (40cm) laptop:

Sit with eyes  approximately 70-75 cm  (2 ½ ft) from the screen.

At this distance you could probably stretch out your arm and touch the screen.

Focus on a finger held 30 cm (1') in front of your eyes

 

22” / 56 cm desktop screen:

Sit with eyes  110- 120 cm  (3’7” – 4’) from the screen.

Focus on a finger held 26 cm (10") in front of your eyes

 

For more information, the cross-eyed method is explained in full here:

a simple example here:

and here

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