> Date:         Tue, 25 Feb 2003 12:49:49 -0500
> From: Zhijie Song <[EMAIL PROTECTED]>
>
> Why the zoom function of orbitbehavior cannot work when the projection
> policy set to Parallel?

OrbitBehavior "zooms" by translating the view platform closer to the object.
With a parallel projection, distance to the object doesn't have any effect on
the rendered size of the object.

If you need a parallel projection zoom, you'll need to either find another
behavior, modify OrbitBehavior, or write your own.  Setting either the screen
scale or the object scale would work; the screen scale is preferable because
updating a view is less expensive than updating geometry.

-- Mark Hood

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