If we increase the window height by a certain percentage, then what we want is the visible height at all distances
to increase by the same percentage.
This can not be done by changing the camera position. Instead you have to change the camera field-of-view.
[link:http://jsfiddle.net/Q4Jpu/ Example].
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<h2>Why is part of my object invisible?</h2>
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This could be because of face culling. Faces have an orientation that decides which side is which. And the culling removes the backside in normal circumstances. To see if this is your problem, change the material side to THREE.DoubleSide.