[ODE] Low performance with multiple meshes... why?

[STenyaK (Bruno Gonzalez)]

Uhh.. i was hash space. I tried simple, and framerates are back to 60fps!  
:D Is hash supposed to be slower than simple?
     //spaceID = dHashSpaceCreate (0);
     spaceID = dSimpleSpaceCreate (0);
I've also tried quadtree but it seems to run so fast as Simple:
     dVector3 center;
     center[0]=center[1]=center[2]=0;
     dVector3 ext;
     ext[0]=ext[1]=1000;
     ext[2]=100;
     spaceID = dQuadTreeSpaceCreate (0, center, ext, 4);
My profiling code tells me graphics is not the bottleneck so... maybe my  
virtual world is simple enough that a quadtree makes no difference?

Thanks a lot for your help!!

On Thu, 20 Jul 2006 22:23:50 +0200, Megan Fox <shalinor at gmail.com> wrote:

> What collision space type are you using?  Simple type would definately
> have that sort of result.
>
> On 7/20/06, STenyaK (Bruno Gonzalez) <stenyak at gmx.net> wrote:
>> Hi, i'm coding a car simulator.
>>
>> I used to use a single static mesh for the track, and collide the car (4
>> spheres + 2 boxes, and about 20 joints) and trackside objects (5 cubes  
>> or
>> so) against it. Framerates were always "good" (about 60fps or so  
>> average).
>>
>> However, i'm now allowing to specify the track as several static meshes
>> (not just one, but usually 30 or so, keeping the overall track
>> shape/triangles pretty much the same afaik). As a result, it's all  
>> running
>> much slower.
>>
>> Due to SDL's low precission time measures, i can't tell if it's the
>> integrator, the collision detector, or my own code.
>>
>> Is ODE expected to behave so bad in those conditions? I'm already
>> bypassing collisions between objects contained by the same container  
>> (that
>> meant *reaaaally* low framerates, not just low framerates like now), so  
>> i
>> think it's something else. Does ODE optimize meshes in such a way that
>> it's always so much better to merge all meshes into one?
>>
>> Thanks in advance! :D
>>
>> (you can watch some vids of the sim at http://motorsport-sim.org :)
>>
>> --
>> Saludos,
>>      STenyaK
>>
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>
>



-- 
Saludos,
     STenyaK

_______________________________________________
Site:   http://1ksurvivor.homeip.net  <1kSurvivor>
         http://motorsport-sim.org     <Motorsport>
         http://kwh.iespana.es         <KuantikalWareHouse>
         http://emuletutorial.info     <EmuleTutorial>
ICQ:    153709484
Mail:   stenyak AT gmail DOT net