Dear all,
 
  I used the stereo mode in my osg program, and the trackball camera 
manipulator.
 
  But when I try to zoom nearer to the object, the mouse wheel and the 
right-key operation get  different results.
 
  Using the right key (mouse) to zoom, it seemed that the eye separation 
changed bigger, and this make Physical discomfort.
 
  Using the mouse wheel to zoom,  the result is right.
 
  I just want to find the reason, because the "eye separation" problem lead to 
some other trouble.
 
  Can someone give me some suggestions.
 
  Thanks.
 
  whu
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