Re: advice on using Performer

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Andy Shein (ashein++at++orac.boston.sgi.com)
Fri, 12 Sep 1997 05:06:41 -0700

How about taking a look at Dave Luebke's portal culling
instead of the BSP.

http://www.cs.unc.edu/~luebke/visibility.html

   I have used it for a ship walkthru and it works great.
I have a version that uses OpenGL instead of IRIS gl
which you may wnat to use on an Octane.
                        Andy

On Sep 11, 10:05pm, T. M. Murali wrote:
> Subject: Re: advice on using Performer
> 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.
>
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from T. M. Murali

-- 
Andrew Shein   SE Stout               email: ashein++at++boston.sgi.com
Silicon Graphics Inc.                 phone: (508) 562 - 4800
1 Cabot Road                            fax: (508) 562 - 4755
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