Re: [Pyode-user] embarrased that I can't figure this one out

[Robert R. <tif...@ho...>]

Thank you for looking at my code snippet!
Unfortunately, none of the changes you suggested seemed to help.  (including 
the change of mass)

Does it work for you?  If it does, that might show I have something wrong 
underneath.


>From: Hart's Antler <bha...@ya...>
>To: Robert Reed <tif...@ho...>,  
>pyo...@li...
>Subject: Re: [Pyode-user] embarrased that I can't figure this one out
>Date: Thu, 6 Apr 2006 13:32:55 -0700 (PDT)
>
>hi robert,
>
>try this:
>
>world.setERP(0.2)
>world.setCFM(0.05)
>
>and every frame do:
>v = vec3( body.getLinearVel() )
>body.addForce( -v*0.1 )
># this add air friction
>
>your mass looks pretty high also, i usally keep in ranges of 0-100
>
>good luck,
>-brett
>
>--- Robert Reed <tif...@ho...> wrote:
>
> > Help!
> > ok, I tried to boil down the pyode tutorial 3 to a very simple 38 line
> > program just to test it.  There are only two bodies - a plane and a box.
> > The print function at the bottom is the only output.   In theory, the 
>box
> > should fall and stop.
> >
> > Interestingly, the callback seems to be called at the correct time (when 
>z
> > is just less than 5) but the box falls too far (say -20) and then 
>bounces
> > too high (back to near 46).  It's like the plane is made of very soft
> > rubber.  Tutorial 3 does not display this behavior - the blocks fall and
> > stop.
> >
> > I have been playing with this code far too long - adjusting various
> > parameters (bounce, etc) with no luck.  I must be missing something
> > obvious...
> >
> > Any help would be greatly appreciated.  Thanks!
> >
> > Here is the code:
> >
> > import ode
> >
> > def near_callback(args, geom1, geom2):
> > 	contacts = ode.collide(geom1, geom2)
> > 	world, contactgroup = args
> > 	for c in contacts:
> > 		c.setBounce(0.2)
> > 		c.setMu(5000)
> > 		j = ode.ContactJoint(world, contactgroup, c)
> > 		j.attach(geom1.getBody(), geom2.getBody())
> >
> > contactgroup = ode.JointGroup()
> > world = ode.World()
> > world.setGravity( (0, 0, -9.81) )
> > world.setERP(0.8)
> > world.setCFM(1E-5)
> >
> > space = ode.Space()
> >
> > floor = ode.GeomPlane(space, (0,0,1), 0)
> >
> > body = ode.Body(world)
> > M = ode.Mass()
> > M.setBox(10000, 10, 10, 10)
> > body.setMass(M)
> > geom = ode.GeomBox(space, (10, 10, 10))
> > geom.setBody(body)
> > body.setPosition((50, 50, 50))
> >
> > fps = 80.0
> > dt = 1.0/fps
> >
> > while True:
> > 	pos = body.getPosition()
> > 	print 'z =  ', pos
> > 	space.collide((world, contactgroup), near_callback)
> > 	world.step(dt)
> > 	contactgroup.empty(
> >
> >
> >
> >
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