Re: texture shaking

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Gordon Tomlinson (gordon++at++paradigmsim.com)
Thu, 09 Sep 1999 07:24:19 -0500

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Are you using Vega's LADBM, this was created to solve the problems
you get when you move a large distances from the Origin 0.0.0.

The shaking of polygons and texture can normally be attributed
precision problems when you are far from the 0.0.0

as I said above LADBM solves this problem and give you access
to Double floating point precision.

If you are using LADBM and have these problems still, it would be
best to log a support call, where were can follow up and get you a solution.

regards

Gordon

Angus Dorbie wrote:

> 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/

Regards

Gordon.

Gordon Tomlinson | Multigen - Paradigm Inc Vega Software Engineer | Suite 400, 14900 Landmark Blvd Email: gordon++at++paradigmsim.com | Dallas, Texas 75240, USA Tel: 972 960 2301 | Fax: 972 960 2303 ______________________________________________________________

'Smoke me a kipper skipper, I'll be back for breakfast' ______________________________________________________________

NOTE: All opinions here within this email are soley mine and DO NOT reflect those of MultiGen Paradigm or any other employee.