Re: ASD and terrain variability

New Message Reply Date view Thread view Subject view Author view

Jenny Zhao (zhz++at++dandan.engr.sgi.com)
Thu, 2 Oct 1997 18:51:23 -0700

On Oct 2, 12:40pm, Lee Willis wrote:
> Subject: RE: ASD and terrain variability
>
> [ plain text
> Encoded with "quoted-printable" ] :
The MultiGen ASD terrain generator (CAT) builds the terrain mesh to a variable
depth, depending on roughness. So over water, it would only build 1 LOD, over
flat terrain, it would build few LODs, and over rough terrain, it would build
many
>
> The run-time playback algorithm itself isn't well suited to making those
decisions. It's more of a database generation issue.
indeed.
and allowing adaptive meshing is the key feature of
active surface definition.
the ASD tree does not have to be uniform every where, for example
CAT generates such trees.

some people combine that with an evaluation functions that takes
projected on screen area into consideration,
and the effect of which would result in displaying
a terrain that is coarse in flat areas and fine in rough areas.

> -------
> Lee Willis Software Architect
> Lwillis++at++terrex.com Terrain Experts, Inc.
>
>
> -----Original Message-----
> From: perfly++at++segolene.roazhon.inra.fr [SMTP:perfly++at++segolene.roazhon.inra.fr]
> Sent: Thursday, October 02, 1997 9:03 AM
> To: info-performer++at++sgi.com
> Subject: ASD and terrain variability
>
> Salut.
>
> Is it possible to use the Active Surface Definition describe
> by the pfdLodMesh structure, with the depth (LOD) of the subtree
> of faces depending on terrain variability?
>
> For example:
> 1 level for the sea,
> 2 levels for areas with quite constant slope,
> ..
> 10 levels for areas with very variable slope.
>
> Thanks for all
>
> Kenavo
>
>
>
>
>
>
>
>
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>
>
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Lee Willis

-- 




Jenny Zhao                                   
zhz++at++engr.sgi.com                    
650 933-5091 (Voice)           
650 965-2658 (Fax)         
Silicon Graphics - IRIS Performer      
=======================================================================
List Archives, FAQ, FTP:  http://www.sgi.com/Technology/Performer/
            Submissions:  info-performer++at++sgi.com
        Admin. requests:  info-performer-request++at++sgi.com

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:56:03 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.