Re: Modifying ClipMaps in RealTime

New Message Reply Date view Thread view Subject view Author view

Angus Dorbie (dorbie++at++sgi.com)
Mon, 20 Jul 1998 15:00:30 -0700

Jeffry J Brickley wrote:
>
> Has anyone tried modifying the imagery of a ClipMap on-disk/in-memory in
> real-time? We have had a theoretical discussion of doing so here, but are
> not sure what the stumbling blocks of doing so would be.....
>

If you view the active tiles and CLIP regions as caches, the main
stumbling block is the lack of an interface to flush the cache
efficiently. You need MIP maps also.

I started to look at this to store orthorectified imagery in the UAV
demo at http://www.dorbie.com/ but didn't take the idea any further.

You'd have to write a fair amount of code to check if the data on the
disk were being used and then load the appropriate image caches and
the hooks to do this aren't there so it'd be ugly.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:57:43 PDT

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