On active stereo presentations using projectors, using shutter glasses, there is
a phase delay of one frame, which is enough to swap left / right eye and mess
the stereoness. This delay is caused by projector, which spend some time by
processing image internally.
I propose a new method on Canvas3D to enable this state and a few changes on
Renderer. This can be more comfortable for programmer and common user, and avoid
get out of application to set "Reverse left right eye" somewhere hidden on video
card's control panel.
I had a running test case and works fine.
This fix would included updates on Javadocs