RE: Help building paging ASD.

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Greg Harrison (harrisog++at++geocities.com)
Wed, 3 Feb 1999 19:46:39 -0500

I'm not sure the extent to which it's of use, but did you see the paper
presented at SIGGRAPH last year by UNC using a 'perturbation metric'?
(Cohen, Olano, Manocha."Appearance-Preserving Simplification") It was
related more to bump maps though and I think you're dealing more on a vertex
basis.

Greg

We have experimented with different ways of morphing normals, none
of them seems satisfying. You can see popping on the terrain
because lighting is not continuous. Even if a per-vertex-per-face
normal is used, doing normalizing normals in software is
pretty expensive.
This is why we didn't put it in the paging support for ASD.
In libpfdu/pfdBuildASD.c, we gave an example
of how the normals are generated and stored.

Jenny Zhao zhz++at++engr.sgi.com 650 933-5091
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