two things come to my mind:
- You bounds are two small, and get your scene 'optimized' out.
- You have a zbufer problem, try changing the view's far plane.

At 27/01/2003 14:00:00, you wrote:
>Hello all,
>
>I've created a scenegraph subject to mouse zooming behaviors but when I
>zoom out to a certain point the portion of the scene at the far back just
>disappears, like it is disappearing behind a black curtain.  The same
>thing happens if I start with the viewing platform too far away from the
>origin, i.e. at a certain distance the scene just disappears.
>
>Any suggestions?  Thanks in advance.
>
>Mark Ettinger
>[EMAIL PROTECTED]
>
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