Re: cliptexture loading

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Hanit Galili (hanit++at++bvr.co.il)
Tue, 15 Sep 1998 10:06:03 +0000

On Sep 15, 8:56am, Rob Jenkins wrote:
> Subject: Re: cliptexture loading
> Hanit Galili wrote:
> >
> > hi.
> >
> > I am using cliptextures with high resolution insets.
> > When I'm flying in the high res areas - everything is o.k., but when I'm in
the
> > low res areas and I put the statistics on - I see that textures are loading
> > ALL THE TIME !!!!!
> >
> > Is there a good reason for this?
> > Am I missing something?
> >
>
> Hanit, are you seeing some performance problem ? Does the paging seem to
> slow you down ? It shouldn't. The great thing about clipmapping/iR is
> that there is the bandwidth to cache the various levels of a clipmap and
> keep trickling in new texture to the TRAM around you as you need it, I
> would always expect to see this texture trickle in a clipmapped app,
> it's what makes clipmapping superior to other methods like paging in big
> tiles at once as you need them, the paging is controlled and low enough
> overhead to not suddenly hit your frame rate.

I know that I should see this effect when I move around the database, but when
I stop moving (and then I give exactly the same Clip Center each frame) I
should see texture loading.
But still - even when I stop - I see texture loading in my low res areas, and
not in my high res areas.
My guess is - that it's something connected to the fact that in the high res
areas I have all the level of the texture in the disk, and in the low res there
are 2 levels missing in the disk (that's why it's low res) - but still - why
texture loading???

> Are you seeing something
> that doesn't sound like that ? I guess that in your hi-res inset you
> have everything cached and don't page until you move into the low-res
> area with presumably larger textures/more levels.
>
> Cheers
> Rob
>
> > thanks,
> > hanit.
> >
> > --
> >
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> --
> ________________________________________________________________
> Rob Jenkins Silicon Graphics mailto:robj++at++sgi.com
>-- End of excerpt from Rob Jenkins

--


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	* hanit++at++bvr.co.il (hanit galili) *
	* Phone - 972-3-5715671		 *
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