[PD] How do I squeeze more performance out of Gem?

John Harrison johnharrisonwsu at gmail.com
Wed Mar 9 16:32:46 CET 2011

>> On Wed, Mar 9, 2011 at 1:59 AM, cyrille henry <ch at chnry.net <mailto:
>> ch at chnry.net>> wrote:
>>    hello,
>>    - try using a display list to render a sphere, so that every point
>> don't have to be send for every sphere.
>>    see exemple 09.openGL/02.displaylist
>>    you can also use a model with a sphere.obj to have the same result.
>> if the spheres are all moving at once, would a display list still help?
>> Seems like recompilation would have to happen for every sphere for every
>> frame? I haven't tried the model yet...
>>  yes, the display list will help to render 1 single sphere.
> you have to call it 200 times.
> Ok I'm seeing a huge performance difference between using 200 of [sphere
<size-doesn't-matter> 20] and [sphere <size-doesn't-matter> 30]. Huge. So if
I want to keep the sphere with 30 points, I'm thinking gemlist or model are
my answer. I'll try both and report back, unless you have a strong
recommendation for one or the other to save me time.

This list is awesome. Where else could I find help like this? :-)

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