The issue regarding the edges of the screen is something that does need thinking about - especially left and right of screen when viewing stereoscopic images in a small sized screen (smaller than IMAX).

In the next image the convergence point is with the chap (David Bush, if you're wondering) seated in the background, with the camera rig and operator well into the foreground, a long way in front of the screen plane.

Images curtesy of Pietro Carlomagno - www.carlomagno3d.it - and taken from the set of 'Inferno'.

But the problem with this image is that the camera dolly is exiting the screen frame to the right and bottom, while positioned in front of the screen plane. This destroys the illusion of 3-D as your brain tells you any object in front of the screen plane should not be cut off by the screen edges.

(It is the left and right of screen that causes the real problem, rather than top and bottom.)

In the following image the point of convergence has been moved to front of the camera dolly, placing all objects behind the screen plane, so the camera dolly now looks to be behind the screen and is naturally cropped by the screen edges.

Images curtesy of Pietro Carlomagno - www.carlomagno3d.it - and taken from the set of 'Inferno'.

In reality, there are usually few times that objects should be allowed to extend beyond the screen plane unless the object is fully contained within screen frame surround - and even then such 'in your face' 3-D effects can easily distract from the story. Use with caution

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Contact steve@lightillusion.com for more info.