Re: advice on using Performer

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T. M. Murali (tmax++at++cs.duke.edu)
Thu, 11 Sep 1997 22:05:09 -0400 (EDT)

Rémi Arnaud writes:
> T. M. Murali wrote:
> >
> > Hi,
> > I am planning to write a walkthrough application on top of Performer
> > and would like some advice on the issues I am facing. I will be using
> > an SGI Octane with two R10000 processors.
> >
> > The application will first read in an input model (say, containing
> > only triangles) and construct a Binary Space Partition (BSP) for the
> > model. For each frame, it will traverse the BSP in a depth first order
> > that depends on the viewpoint, determine the triangles that are
> > visible, and render them. The application uses some tricks to
> > determine (a small subset of) the visible triangles and render only
> > these triangles.
>
> Is there any reason why you do not use the Z-buffer ?

I am sorry. I should have been more clear. I *will* render the visible
triangles using the Z-buffer. Even if I know a triangle is visible, I
will not know exactly which portions of that triangle are
visible. Hence, to form the final image, I do need the Z-buffer.

The basic motivation of the application is to do occlusion culling in
software.Hence, rather than rendering *all* triangles in the view
frustum using the Z-buffer, I want to determine which are (partially)
visible using the BSP and render only these.

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