RE: [Virtools] Performance drop when textures come into view for the first time

[Patrick Hogenboom <p.hogenboom@mcw.nl>]

Hi Arnoud,
thanks very for pointing out the SystemToVideoMemory call :)

About texture compression, are you sure it causes delay ?
I just put texture compression on my biggest maps and have noticed a speed increase.
Ok, I also resized the textures to a power of 2 (maybe that outweighed the compression performance hit)
This made a real impact as virtools upscaled them to the nearest power of 2, causing the memory footprint to soar !
Maybe there should be a preferences setting to scale non-pow-2 textures up or down.

Is there any way of preventing the need for re-uploading the textures after a reset ?

Just one little question :
How do I set up a loop that iterates through all textures ?

Thanks, Patrick

>Hi patrick,
>
>The delay is due to system to video bitmap data transfer. The more the
>data, the longer the delay. Delay grows even longer while using texture
>dynamic compression (DXT).
>To fix that, you should loop on all the textures of your scene using the
>function CKTexture::SystemToVideoMemory(), at the beginning of your
>scene. It will take a few moment, but no more delay after (given the
>fact that ALL textures loaded fit in your video memory of course )
>Arnaud.
>
>> Hi all, 
>> first of all, let me wish you a fun and productive 2002 :D ! 
>> May it bring what you wish / dream for.
>> 
>> I'm having performance trouble when textures come into view 
>> for the first time after I reset / load a world. What I mean 
>> is this : _I load a cmo file _rotate the camera _the 
>> performance drops when ever I encounter new objects/textures
>>   the bigger the texture, the bigger the performance drop. 
>> _after I have completed the full 360 degrees, there is no 
>> more performance drops
>>   Unfortunately, when I reset the scene, the problem comes back !
>> 
>> I think that the performance drop is some kind of AGP 
>> swapping / texture uploading to video ram. But that it comes 
>> back when I reset the scene, just doesn't make sense.....
>> 
>> On fast machines the performance just dips, but on low-spec 
>> machines, the whole application freezes quite some time... 
>> I've seen this under Dev, the standalone player and the webplayer.
>> 
>> My questions are these :
>> _Does anybody have more knowledge or an explanation of this 
>> phenomenon ? _Why does it recur when I reset the world ? _Can 
>> I pre-upload all textures to video ram ?
>>   That way the caching time gets added to the loading time 
>> and it doesn't interfere with the user's experience. _Can I 
>> prevent the clearing of the cache, so that resetting doesn't 
>> recur the problem ?
>> 
>> Thanks in advance, Patrick
>> 
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>
>...............................................................
>Distributed via the virtools-user-group list: http://www.theswapmeet.com/numl.html
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...............................................................
Distributed via the virtools-user-group list: http://www.theswapmeet.com/numl.html
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