The popularity of 3D movies in theaters has spread to the internet, where larger budget 3D productions compete with home-made 3D videos for the viewer's attention. Stereo videos can now be found online on websites ranging from the smaller, personally owned 3Dmovies.com to large, well-funded sites like Vimeo. YouTube even has created a special tag for uploaders to put in their videos (yt3d:enable=true) that adds a 3D pull-down menu to the video, allowing the viewers 12 ways to watch the video, 10 of them in 3D, and only seven requiring 3D glasses.
Anaglyphic (Red/Blue) 3D
Go to a site hosting 3D videos, choose which of the videos you would like to view and click on it.
Select one of the first seven choices in the YouTube 3D pull-down menu (if watching on YouTube). Put on your anaglyphic (red/blue) 3D glasses (which may be made at home or purchased online) and start the video.
View the video in 3D while wearing the anaglyphic glasses.
Parallel 3D Viewing
Click on the YouTube 3D pull-down menu and select "Parallel" (if watching on YouTube).
View the parallel images, then relax your gaze.
View the video in 3D when your relaxed gaze causes the two images to overlap.
Cross-Eyed 3D Viewing
Click on the YouTube 3D pull-down menu and select "Cross-Eyed" (if watching on YouTube).
Pause the video and, while looking at it, cross your eyes until the two images overlap and form a 3D image.
Rewind the video to the beginning and view in 3D.
Mirror Split 3D Viewing
Click on the YouTube 3D pull-down menu and select "Mirror Split" (if watching on YouTube).
Place a mirror directly on the line in the middle of the viewing screen and line your nose in front of the mirror, with one eye on either side of it.
View the video while intending to watch the image on the right side of the screen, which causes the illusion of 3D.