[ODE] Increasing number of particales changes physics

[Roland Kindermann]

Hi,
I work with particles too. I think it would be nice to have a Point 
Geometry (which only consists of one point) for particles. It would 
probably be faster than a small Sphere.
Cheers,
Roland Kindermann

Jacob Ole Juul Kolding schrieb:
> OK I have a fixed step time and that works fine.
> 
> The next problem is when I enable collision (So that the particles 
> bounce against a floor). When the simulation has up to 350 particles it 
> seem to run smoothly and stable, but above 350 it will eventually suffer 
> a slowdown death causing the app to be unresponsive.
> 
> I switched to HashSpace and set the category/collide bits so that the 
> particles should not collide with each other but only the floor.
> 
> Is this a bottleneck?
> 
> /Jacob Kolding
> 
> 
> On 8/11/06, *Jon Watte* <hplus at mindcontrol.org 
> <mailto:hplus at mindcontrol.org>> wrote:
> 
>     Correct. You need to use a fixed time step. Such as in
>     http://www.mindcontrol.org/~hplus/graphics/game_loop.html
>     <http://www.mindcontrol.org/%7Ehplus/graphics/game_loop.html>
> 
>     Jacob Ole Juul Kolding wrote:
>     >  I'm implementing a particle system in ODE and have encountered the
>     >  problem that when the number of particles increase the physics change
>     >  in the the way the even though the same force is applied, the more
>     >  particles are in the simulation the longer they will travel.
>     >
>     >  My guess is that since i step the world each frame, when the frame
>     >  rate drops the step time increase which changes the outcome of the
>     >  simulation?
>     >
>     >  Anyone have an idea how to help this problem?
>     >
>     >  /Jacob Kolding
>     >
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