RE: [Algorithms] HOM vs. Hardware

[Mark W. <Mwa...@to...>]

I used occluders in Carmageddon TDR2000 which were manually placed
convex polygons and were tested against using the CPU. We'd typically
put two of them in a cross formation inside of buildings that you
couldn't enter (eg. an X from the top) and placed them under hills to
obscure scenes beyond them. This worked quite effectively. I did plan to
add occluder fusion, but it didn't really seem necessary nor did I have
the time.

Each frame we simply collected occluders that intersected the frustum,
roughly sorted them from front to back and tested the geometry bounds
against them. If the geometry bounds were inside of all of the planes
defined by extruding the occluder polygon edges away from the camera
point, we simply skipped it. No real magic or fancy stuff, but worked
great.

HTH,
Mark

> -----Original Message-----
> From: gda...@li...=20
> [mailto:gda...@li...] On=20
> Behalf Of Nakunaru
> Sent: Wednesday, 22 June 2005 6:17 AM
> To: gda...@li...
> Subject: [Algorithms] HOM vs. Hardware
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> Has anyone had experience with Zhang's HOM?
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> I recently read a little on the technique and it's simple but=20
> very clever.  Does anyone know if a tuned version can beat=20
> what we've currently got in hardware?
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