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

[Hart's A. <bha...@ya...>]

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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