Re: texture shaking

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 08 Sep 1999 22:16:09 -0700

There are some known and manageable issues with getting close very large
'virtual' CLIP textures. These are handled through the manipulation of
MIP level controls and/or texture coordinates with clip center position.
In some ways the issues are similar to the specification of database
geometry but may appear a little more arcane. Paradigm are experienced
and expert at understanding these issues and if you are using Vega they
may have solutions built in or be able to give you the Vega specific
advice you require. If not then I'll be happy to advise on the general
Performer issues.

Cheers,Angus.

> vsmsa wrote:
>
> I use VEGA/Performer on IR 3 pipe.
> I notice texture shaking on my BDD.
>
> The first reason is that my BDD is too large, so I made tiles of
> 22000m x13000 m and I use dynamic object with the offset option of
> object panel on Lynx.
>
> My polygons always shake, but it's better.
> But if I choose a polygone with low coord., I notice that it's the
> texture which shakes.
> I read the manual pages about texture and detail texture, with a
> maximum of 11 levels. I respect this.
>
> Do you know some other reasons ?
>
> Yoel HALLAKOUN
> VSM sa

-- 
"One of the best-known folk theorems of software engineering is that
60% to 75% of conventional software projects are either never
completed or rejected by their intended users. If that range is
anywhere near true (and I've never met a manager of any experience
who disputes it) then more projects than not are being aimed at goals
which are either (a) not realistically attainable, or (b) just plain
wrong."
                 Eric S. Raymond - The Cathedral and The Bazaar


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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