how to create button zoom
To zoom the device camera, or to create a zoom effect with the augmentation?
The ImageTargetsMenu script in the ImageTargets sample shows how to activate camera focus modes, but you can't set the magnification - this would throw off the camera callibration in any case.
To zoom the augmentation, I'd recommend scaling it rather than moving the ARCamera - http://docs.unity3d.com/Documentation/ScriptReference/Transform.html
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