Re: Problem with texture memory

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Jean-Luc Dery (dery++at++discreet.com)
Wed, 9 Sep 1998 14:28:55 -0400

On Sep 9, 11:34am, Bora Utku wrote:
> Subject: Problem with texture memory
> Hello,
>
> We are developing the 3D model of a large residence area on an Octane
> MXI. We have a serious frame rate problem when we fly thru it with
> "perfly" or a simple Paradigm Vega application.
> According to the perfly statistics there are about 250,000 polygons and
> texture memory usage is 350% of available 4MB. In perfly , frame
> rate drops down to 1 frame/sec with textures on. Without textures
> it is around 12f/s.
> What I need to know is "Can the size of textures affect the performance
> that much?" If so, do we have to decrease texture size to less than 4MB
> for acceptable performance? (We'd rather decrease polygon sizes than
> textures.)

This means that your scene needs about 3.5*4MB of texture memory which exceeds
TRAM capacity. When drawing, textures get paged in and out from the graphics
pipe slowing down your draw procedure. You should try to make your textures fit
in 4MB or at least reduce TRAM usage in order to minimize texture paging.

There's nothing else you can do that I know of.

Hope this helps,

Jean-Luc

-- 
_____________________________________________________________________________


Jean-Luc Dery                         Discreet Logic
Technical Leader                      10 Duke Street
3-D Graphics Technology and           Montreal (Quebec), Canada, H3C 2L7
Realtime Systems                      Tel: (514) 954-7239
Email: jean-lucD++at++discreet.com         Fax: (514) 393-0110
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