From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 08/28/2002 15:54:57
Hello There !
When Performer runs the CULL traversal, it tests each node bounding sphere
against the channel frustum. The traversal path from a pfDoubleDCS down to a
pfSCS is ignored (trivial accept). However, nodes above your pfDoubleDCS have a
bounding sphere and may be culled-out completely.
In your test code, what is the scene graph structure above the top-most
pfDoubleDCS ?
-yair
>
>
> Can someone on the Performer team confirm for me that pfDoubleDCS nodes
> without pfSCS children default to trivial accept when culling. I've taken
> the doubleDCS examples and rotate the object behind the viewpoint. It
> appears to cull properly in both examples as no geometry is reported as
> being visible. Wouldn't I expect visible geometry to be non-zero for trivial
> accept culling?
>
> I've run into a strange behavior in a test case and want to make sure I
> understand the default behavior. My test case reports triangles behind the
> viewpoint as being visible geometry.
>
> Thanks
> Bwana Bawb
>
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