Re: INTERESTING ASD PHENOMENON

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Lee Willis (lwillis++at++inreach.com)
Mon, 24 Aug 1998 10:27:55 -0700


The ASD display algorithm has the behavior that there will never be more
than 1 LOD difference between adjacent triangles. So if Triangle 't' has no
children, then the neighbors of 't' can only display one more LOD, their
neighbors two more LODs, etc.

    Lee Willis

-----Original Message-----
From: Andreas.Ekstrand++at++saab.se <Andreas.Ekstrand++at++saab.se>
To: info-performer++at++sgi.com <info-performer++at++sgi.com>
Date: Monday, August 24, 1998 2:41 AM
Subject: INTERESTING ASD PHENOMENON

>Hi pfAll!
>
>I have come across a somewhat wierd behavior of the ASD.
>The wierdest about it is that it doesn't seem to be
>deterministic, i.e. the phenomenon doesn't always appear,
>though the conditions are the same.
>
>When I prune a face, i.e. erase its childs to make the
>area it covers completely flat, the surrounding faces
>should keep their refverts and their childs. They always
>do this, BUT in certain areas the surrounding faces don't
>show their childs. These wierd faces look as if they were
>pruned too, but I know they aren't.
>
>My guess is that it has something to with the face on the
>other side, i.e. if the wierd face is between two pruned
>faces, or if the wierd face is located at the edge. But
>this assumption doesn't always hold. I have found areas
>where the faces between two pruned faces show their childs
>just as they are supposed to.
>
>Does anybody have any idea how to solve this or just a new
>approach to the problem? I'd be grateful for any comment
>or suggestion.
>
>Thanks in advance,
>Andreas Ekstrand
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