Re: 4Mb texture limit

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Thu, 19 Sep 1996 18:58:54 +0100

On Sep 19, 5:41pm, Duvideo wrote:
> Subject: 4Mb texture limit
> Hi,
>
> I have noticed that when loading my scene the texture memory goes beyond
> the 4Mb limit.
> I get 134% texture memory use in the pfNotify.
>
> Since all my textures appear to be correct... should I worry?

No, the texture should page on demand.

>
> Does it decrease the application's performance?

It can. The worst case is when you exceed this capacity in the immediate
viewing frustum, you'll have to page texture every frame degrading
performance. You may even round robin so the penalty for a minor infraction
can be severe.

Typically though you'll see the odd glitch as the graphics encounters some
texture it needs which is not in TRAM as the result of a moving view or
changing scene.

> What can I do to avoid it?

Stay bellow the hardware limit.
or
Structure your database so that texture paging on demand is planned for
rather than random.
or
Come up with a paging strategy where you anticipate the graphics requirement
and update texture memory in a controlled manner.

>
> thanks
> Duvideo
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>-- End of excerpt from Duvideo

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