[ODE] Geomgroups vs composite

Mon Feb 10 05:55:16 2003

Yes, test_boxstack crashed for me too when adding too many objects. Holding 'x' did the trick, and holding 'b' went a long way as well ;) I have tinkered with that sample app a bit (from v0.035), and removed all the explicit bookkeeping (the MyObject global array). This also means the maximum object limit is gone, and thus means that old objects are no longer removed from the scene. I'm not sure, but it seemed that was the cause of the problem somehow (some access voilation). And now I have absolutely no problems with it anymore (except slowdown when reaching 200 or 300 geoms :P)

I never tried any of the sample apps from 0.03, so I couldn't say anything about that.

greets

> Ok.. I'll stick to composite then, thanks!.
> 
> I have not tried 0.035 yet, the test_boxstack crashed for me when filling 
> up the scene with composite objects (holding down the 'x' key will do the 
> trick). In 0.03 that test works fine, is this a known problem?.
> 
> Cheers!
> 
> At 12:55 2003-02-10 +0000, skjold@cistron.nl wrote:
> >Hi,
> >
> >Well, GeomGroups are deprecated in ODE 0.035, you could use SimpleSpaces 
> >istead. But when it comes to combining multiple geometries into a single 
> >object, I think composite is the way to go, because then it will be 
> >treated as a single dynamic body. Also, as I found out yesterday (I'm 
> >quite new to ODE myself), these component geometries in a single composite 
> >object are, for some reason unknown to me, never tested against eachother 
> >for collision. This is desirable of course, since they all represent the 
> >same rigid body, but I would have thought ODE to still treat it at 
> >separate geometries. So it looks like ODE is way ahead of me, as I was 
> >looking for a way to skip collision testing on those component geoms ;)
> >
> >This does leave me wondering, is it still worthwhile to put the geoms from 
> >a single composite object into their own SimpleSpace? I figure that might 
> >benefit dSpaceCollide, but then again maybe ODE is way ahead of me on that 
> >too. On a side note, I wouldn't mind being able to set user data on 
> >spaces, perhaps this would be nice for a future release.
> >
> >To conclude: WOW! I am impressed by ODE. I've been looking for something 
> >like this (aren't we all inspired by Karl Sims :P) Russel, and the other 
> >contributers too, great job!
> >
> >greets
> >
> 
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