From: Michael Petrou (Michael.Petrou++at++sydac.com.au)
Date: 09/16/2003 21:03:59
> -----Original Message-----
> From: David Lannan
> Sent: Wednesday, 17 September 2003 1:19 PM
> To: Michael Petrou
> Subject: Usage of setCullPolytope()
>
> Questions about using Performer 2.2
>
> 1. We are using Performer 2.2, due to software integration restrictions. I
> would like to know if there is an equivalent way to implement
> pfCullPrograms (which are implemented in 2.5 and above). Ideally the
> example of occlusion culling suggested in the Performer 3.02 manual would
> need to be implemented in version 2.2.
>
> 2. I have been using setCullPtope() and its behaviour appears to be a
> little odd. Is this function simply and implementation of setting the view
> frustum? Is there a way to specify cull behaviour within a particular
> polytope? Currently all objects outside the polytope are culled - this
> seems to be just a frustum cull implementation.
>
> 3. Is there any way to flag a node to be explicitly culled during a custom
> cull process? Setting the cull mask only determines whether the cull
> process should traverse the node, not whether it should/shouldnot be
> culled from being drawn - must the draw mask be set appropriately for this
> to work? Can you cull a node without using a draw mask and without
> removing the node from the scenegraph?
>
> David Lannan
>
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