Cool. You mentioned that your next tutorial is composing a video with the same technique? I’ll look forward to it. However, I may know how it works. Still, I’m willing to explain you anyways.
Once you constrain the camera to the 3D cursor, make a copy of the camera by pressing “Shift-D” and Right-Click to make to copy stay on first camera’s location. Press R, Z, 10, and Enter to make the copy rotate 10 degrees along the Z axis. Highlight (Right-Click) the first camera, copy like before, and R, Z, -10, and Enter to rotate on the other side. Highlight one of the copied cameras, hold Shift, and highlight the first camera. Press Ctrl+P and select “Object” to make the first camera parent to the copied camera. Do the same thing with the other camera. You can now control the first camera, and the “stereoscopic” cameras will follow. Cool, right?
In making movies with Blender, a camera can be tracked by using an Empty. It’s very simple! First, have a camera, like the first camera. Shift-A and “Empty” to add an Empty. Highlight the first camera, hold Shift, and highlight the Empty. Press Ctrl-T and “Track to Constrain” to make camera always viewing the empty. You can move camera or Empty, and the camera will always look at the Empty.
If you like the idea, you can use it. Of course, you can always post your way to make a stereoscopic movie. I’m just here to help.
Any idea for making a “polarized” 3D image or movie? What you made is like the tradition “Red-Blue” 3D image, which is not bad. However, I prefer to make a polarized version, in which you can see in Digital 3D movies or movies that come with polarized 3D glasses, and yes, you can buy one easily. http://www.the3dmarket.com/Paper/polarized.asp I wonder how it is made. Perhaps it is the change of contrast or something. I am sure someone can find out how it works.