![](http://doc-ok.org/wp-content/uploads/2012/08/g4440-71.png)
Figure 2: The left stereo image shows the keystoning effect caused by toe-in stereo. A viewer will not be able to merge these two views into a single 3D object. The right stereo image shows the correct result of using skewed-frustum stereo. You can try for yourself using a pair of red/blue anaglyphic glasses.