Re: [Pyode-user] pyODE and PyOSG

[brett h. <bha...@ya...>]

Hi Tim,

I was actually already planning to update the tutorials and those were changes i was planning to
make, its going to take a little time though because i am in the middle of fixing some things in 
PyOSG.  I'll let you know when i've made the updates.

I'm not sure where that Segfault is comming from either; its strange, but maybe as we do more
testing, it will become clear.  In the meantime it does not seem like a big problem because i
don't think that that many objects should ever be intersecting in the first place.

-brett

--- Timothy Stranex <ti...@st...> wrote:

> Hello,
> 
> I've finally been able to get OSG and PyOSG built and installed.
> 
> On Sat, 2004-10-02 at 22:33, brett hartshorn wrote:
> > I have ported tutorial2.py and tutorial3.py to use PyOSG as the renderer, i thought
> > that someone may want to include them in CVS because i think it might be another good
> > example. 
> 
> They're pretty cool. I have two suggestions, if you're interested:
> 
>     1. In tutorial2_osg.py, start with the camera further away from the
>        blocks and facing them.
>     2. In tutoiral3_osg.py, add a little more light and colour the base
>        plane.
> 
> > Also attached is the file named tutorial3_osg_segfault.py.  This file will crash when you
> > run it because it seems that if more than 34 bodies collide at once (at least on the first
> > frame if they are all intersecting), then pyODE will crash by segmentation fault.
> 
> After testing it on my computer, it segfaults if here are more than 68
> objects. I've done some looking but I can't work out what's causing it.
> The segfault occurs in world.step() or world.quickStep(). My
> investigation found two potential problems:
> 
> 1. Body.setMass() takes a Mass object argument. It doesn't keep a
> reference to it but uses its dMass Mass._mass for dBodySetMass(dBodyID,
> const dMass *mass). If the Mass object is deallocated, ODE could still
> try to access it.
> 
> 2. ContactJoint uses Contact objects for ODE calls without keeping
> references. ODE might still try to access it even if the Contact object
> has been deallocated.
> 
> I'm not entirely sure if the above points are correct because none of
> the tutorials ever crash even though they could by the above mechanisms.
> Also, fixing them doesn't fix the segfault problem above.
> 
> What do you think?
> 
> -- 
> Timothy Stranex <ti...@st...>
> 

> ATTACHMENT part 2 application/pgp-signature name=signature.asc




		
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