pyode-user — PyODE User Discussions

[Pyode-user] lifting force

[Markus F. <fel...@gm...>]

Hi All,

i am new to pyODE.

Can i use pyODE for Problems like lifting force at Water.
For Example i have got a empty Bottle which will be swim on the Water,
but will be sink if it is filled with Water. My Programm should calculate
what will happen. Or if something lies on the bottle and push the Bottle 
into the Water.

Bye Markus

Re: [Pyode-user] contact issues

[nicholas s. <nic...@gm...>]

The GL related error is a typo in tutorial 3.
There is a "glScale", and should be "glScalef" or glScaled".
...see here:
http://pyopengl.sourceforge.net/documentation/manual/glScale.3G.html

On Jan 21, 2008 11:26 PM, tim rau <bla...@ya...> wrote:

> Hi! I've already posted about an issue with tuorial
> 3,but it seems to be an openGl issue, rather than an
> Ode issue.
>
> Skipping around it, I've decided to use the turorial
> code anyway, putting the stuff from the tutorial into
> my own code. Collisions appear to be detected
> normally, but there is an issue with the callback. I'm
> not sure where to go, or what direction to search in.
> The docs at ode.org haven't proven useful in that
> regard. Please take the time to help me, or at least
> point me towards help.
>
> Here's the exception stuff whenever I fly my ship into
> the asteroid:
>
>
> Exception exceptions.AttributeError: "'ode.Contact'
> object has no attribute 'setBound'" in
> 'ode.collide_callback' ignored
>
> Exception exceptions.AttributeError: "'ode.Contact'
> object has no attribute 'setBound'" in
> 'ode.collide_callback' ignored
>
> Exception exceptions.AttributeError: "'ode.Contact'
> object has no attribute 'setBound'" in
> 'ode.collide_callback' ignored
>
> It does that every frame until I fly out of it again.
>
> Here's my loop code:
>
> collideSpace.collide((collideSpace,contactgroup),collideCallback)
>    space.step(clock.get_time()/1000.0)
>    contactgroup.empty()
>
>
>
> Heres the code that is part of my main loop:
>
> -NIm
>
> If all else fails:
> su
> *******
> rm -rf /
>
> Windows error: OMFG THERZZ AN ERRROR!!111 WTF??!?!?!
> Linux error: Hello there, you have an error. Here's a detailed list of
> what's gone wrong and here's how to fix it. Would you like some coffee?
>
>
>
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[Pyode-user] contact issues

[tim r. <bla...@ya...>]

Hi! I've already posted about an issue with tuorial
3,but it seems to be an openGl issue, rather than an
Ode issue.

Skipping around it, I've decided to use the turorial
code anyway, putting the stuff from the tutorial into
my own code. Collisions appear to be detected
normally, but there is an issue with the callback. I'm
not sure where to go, or what direction to search in.
The docs at ode.org haven't proven useful in that
regard. Please take the time to help me, or at least
point me towards help.

Here's the exception stuff whenever I fly my ship into
the asteroid:


Exception exceptions.AttributeError: "'ode.Contact'
object has no attribute 'setBound'" in
'ode.collide_callback' ignored

Exception exceptions.AttributeError: "'ode.Contact'
object has no attribute 'setBound'" in
'ode.collide_callback' ignored

Exception exceptions.AttributeError: "'ode.Contact'
object has no attribute 'setBound'" in
'ode.collide_callback' ignored

It does that every frame until I fly out of it again. 

Here's my loop code:
   
collideSpace.collide((collideSpace,contactgroup),collideCallback)
    space.step(clock.get_time()/1000.0)
    contactgroup.empty()



Heres the code that is part of my main loop:

-NIm

If all else fails:
su
*******
rm -rf /

Windows error: OMFG THERZZ AN ERRROR!!111 WTF??!?!?!
Linux error: Hello there, you have an error. Here's a detailed list of
what's gone wrong and here's how to fix it. Would you like some coffee?


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[Pyode-user] Error in tutorial

[tim r. <bla...@ya...>]

Hi! I'm new to this group, and new to ODE. 

I also have an error when I try to run tutorial 3, but
not the same one as you. Here it is:
Traceback (most recent call last):
  File "C:\Documents and Settings\Owner\My
Documents\NIm's code\sandbox\demode.py", line 172, in
<module>
    glutInit ([])
  File
"C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py",
line 309, in glutInit
    _base_glutInit( ctypes.byref(count), holder )
  File
"C:\Python25\Lib\site-packages\OpenGL\GLUT\special.py",
line 56, in _base_glutInit
    return __glutInitWithExit(pargc, argv, _exitfunc)
  File
"C:\Python25\Lib\site-packages\OpenGL\platform\baseplatform.py",
line 258, in __call__
    self.__name__, self.__name__,
NullFunctionError: Attempt to call an undefined
function __glutInitWithExit, check for
bool(__glutInitWithExit) before calling


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[Pyode-user] glError in tutorial 3?

[Samuel M. <wat...@sp...>]

Hello,

I got pyODE working (Never figured out what the problem was, but I 
redownloaded it yesterday and it worked), but now when I run the third 
tutorial from the website, it spits out this about fifty times:

Traceback (most recent call last):
  File 
"/Volumes/Data/Users/ronald/Projects/python/wrk/r251/Modules/_ctypes/callbacks.c", 
line 206, in 'calling callback function'
  File "/Users/samuelmankins/Desktop/tut3.py", line 225, in _drawfunc
    draw_body(b)
  File "/Users/samuelmankins/Desktop/tut3.py", line 73, in draw_body
    glScale(sx, sy, sz)
NameError: global name 'glScale' is not defined

And then switches to spitting out this about fifty times for every 
second the pygame window (Which shows up, with the background color on) 
is open:

Traceback (most recent call last):
  File 
"/Volumes/Data/Users/ronald/Projects/python/wrk/r251/Modules/_ctypes/callbacks.c", 
line 206, in 'calling callback function'
  File "/Users/samuelmankins/Desktop/tut3.py", line 225, in _drawfunc
    draw_body(b)
  File "/Users/samuelmankins/Desktop/tut3.py", line 69, in draw_body
    glPushMatrix()
  File "build/bdist.macosx-10.3-fat/egg/OpenGL/error.py", line 188, in 
glCheckError
OpenGL.error.GLError: GLError(
        err = 1283,
        description = 'stack overflow',
        baseOperation = glPushMatrix,
        cArguments = ()
)


I anyone has any idea what's going on here, I'd greatly appreciate it. 
Thanks!

[Pyode-user] getFeedback

[Advait J. <adv...@gm...>]

I am using pyode for robotics simulation and wanted to be able to
get the torques being applied at different joints of a serial link robot
arm.

As a test I made a simple pendulum -
 mass of the ball - 1.3Kg
 length of rod - 1meter

I have put a hinge joint between the rod and ode.environment (with axis
alog the z-axis) with a maximum torque of 8 and set its angular velocity to
0.1

After the pedulum reaches equilibrium (at an angle of about 40degrees)
I use joint.getFeedback to look at the forces and torques being applied by
the
hinge joint.

The force is fine: (-0.048762871567434196, 12.818460075084928, 0.0)
  This corresponds to the expected mg in the y-direction.

However, I do not get sensible values for the joint torques -
 (0.0, 0.0, -0.00035495714435794957)
I was expecting a joint torque of 8 in the z-direction.

I am doing the following -
 joint.setFeedback(True) before calling joint.getFeedback.

I have tried this at timesteps of 10ms and 1ms with the same results.

Any help/suggestions about what else I could try?

Advait

Re: [Pyode-user] Error in the PyODE tutorial

[Ethan Glasser-C. <gl...@cs...>]

Forgot to send this to the list; sorry Samuel Mankins for the
duplicate mail..

Samuel Mankins wrote:
> Traceback (most recent call last):
>   File "pyodestuff.py", line 3, in <module>
>     import ode
>   File "build/bdist.macosx-10.3-fat/egg/ode.py", line 7, in <module>
>   File "build/bdist.macosx-10.3-fat/egg/ode.py", line 6, in __bootstrap__
> ImportError: 
> dlopen(/Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so, 
> 2): Symbol not found: _dMassSetCappedCylinder
>   Referenced from: 
> /Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so
>   Expected in: dynamic lookup

That's pretty interesting. It looks to me like compatibility with the
old dMassSetCappedCylinder function names is provided by ODE 0.8 using
a #define in mass.h:

#define dMassSetCappedCylinder dMassSetCapsule
#define dMassSetCappedCylinderTotal dMassSetCapsuleTotal

Pyrex should have compiled to C and used these definitions. I have to
say I'm not familiar enough with Pyrex to understand what's going on.

Attached is a patch which ought to move PyODE to the new "Capsule"
names from the old CappedCylinder names -- this had been done with the
Geom functions but I forgot to do the Mass functions. You could apply
this and try to rebuild; I don't know if that would help or not.

One other thought -- I see that you say you're running Mac OSX 10.4,
but the filenames above say 10.3. Might there be a collision between
two different versions of ODE? I really don't think this is what's
going on either, but I thought I'd demonstrate my ignorance of OSX for
your amusement.

Ethan

[Pyode-user] Error in the PyODE tutorial

[Samuel M. <wat...@sp...>]

Hi. I'm completely new to pyODE and 3d stuff in general(Although not 
python), and I was doing the tutorials, but when I tried to run the 
first one, it spat out this error:

Traceback (most recent call last):
  File "pyodestuff.py", line 3, in <module>
    import ode
  File "build/bdist.macosx-10.3-fat/egg/ode.py", line 7, in <module>
  File "build/bdist.macosx-10.3-fat/egg/ode.py", line 6, in __bootstrap__
ImportError: 
dlopen(/Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so, 
2): Symbol not found: _dMassSetCappedCylinder
  Referenced from: 
/Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so
  Expected in: dynamic lookup

I tried copy-pasting the code from the tutorial to see if I had made a 
mistake somewhere, but it gave the same result. I have version 1.2.0 
pyODE (Gotten with easy install) and version 0.8 of ODE (Gotten with 
DarwinPorts), and I'm running Mac OSX 10.4. Do any of you know what's 
going on here, and how I can fix it?
Thanks!

[Pyode-user] roatating a mass and related...

[nicholas s. <nic...@gm...>]

Hi,
Is there a way to rotate the a mass before fixing it to a body, like
dMassRotate() in C? How about PyODE for

    dMatrix3 Rtx;
    dRFromAxisAndAngle(x,y,z,angle)

Thanks,
Nick

[Pyode-user] How do I set ParamLoStop, ParamHiStop using pyode?

[Salik S. <ss...@st...>]

I've tried using the
__setattr__ method passing in a string 'paramHiStop' that did not work...
I tried just doing
j.paramHiStop = 1
that didn't work
pls help
Thanks

-- 
www.saliksyed.com <http://www.saliksyed.com>

[Pyode-user] How to save and restart simulations?

[Salik S. <ss...@st...>]

Anyone had success on this one?
I'm having lots of trouble, when I reset the values the system explodes 
or spins
very very fast
Thanks for any help
-Salik
-- 
www.saliksyed.com <http://www.saliksyed.com>

[Pyode-user] atamopor

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[Pyode-user] =?utf-8?b?5oKo5aW9LOivt+afpeaUtu+8gQ==?=

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[Pyode-user] This UNIX e-mail bomber is reportedly written by CyberGoat, an anonymous cracker out in the void.

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[Pyode-user] Ray contact position wrong

[witmud <wi...@ya...>]

i setup a ray test for selecting body :

#------A Ray code :
start = (-1,1,2)
end = (-1,1,-2)
ray = ode.GeomRay(space, 10)
ray.set(start,end)


#------Ray collision detecting code:

for i in range(space.getNumGeoms()):
    geom1 = ray
    geom2 = space.getGeom(i)    
    contacts = ode.collide(geom1, geom2)
    if contacts and geom2.placeable(): 	    
	#print contacts
	gpos = geom2.getBody().getPosition()
	print "Gpos=", gpos
	cpos, normal, depth, geom1, geom2 = contacts[0].getContactGeomParams() 
	print "Cpos=",cpos, normal
	break 

but the displayed contact position is wired, this is the output on console:
#-------Cpos is contact position

Cpos= (-1.7109856605529785, 1.7109856605529785, 0.57802879810333252)
Cpos= (-1.7049093246459961, 1.7049093246459961, 0.59018146991729736)
Cpos= (-1.6461362838745117, 1.6461362838745117, 0.70772731304168701)

you know the ray is fixed from start = (-1,1,2) to  end = (-1,1,-2), y =1, so all of
Cpos.y should be 1.0
but all Cpos.y are more than 1!




       
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[Pyode-user] I changed my mind.

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[Pyode-user] As will be explained below, the conditions leading to any of the three specific error codes listed above are somewhat environment-specific.

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U*n'd d.a_n*n e-r-s-t g+i,b-t er s+eine Zuruc-*khaltung a.u_f,, luss*t s*i c'h fa*llen u.n_d kr_allt u,n'd b'ohrt u.n.d bei-sst s.i.c_h in d-a-s fre+mde Fleisc*h. 
T'h,e restri,cti-ve We'stern not-ions of t,r,u*e a_n.d fal_se a-r_e n o*t u,s_e d,. 
On th-ese nig,htly exc 'ursions s+h-e care,fu'lly avoide*d t,h_e Amyr l.in's study., t.h*e n*ovic*es' qu'+arters, e-v+e-n t h,e A*cce-pted's quar+te'rs. 

Bef,ore y o+u c.a n s_e't t_h,i's pro*pe,rty, y-o.u m+u_s t s e t t.h+e S'h_o-w Seri'al Numb er propert*_y to Y.e,s'. 

Rig ht clic k give's y-o*u t+h'e ma+_cro-editing window . 

[Pyode-user] =?GB2312?B?y83GscnPw8WjoQ==?=

[sp <szg...@16...>]

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[Pyode-user] =?GB2312?B?y83GscnPw8WjoQ==?=

[sp <szg...@16...>]

欢迎合作*送票上门
    公司本着互惠互利的原则合理对外代开发票,代开范围(商品销售、广告、

“电脑版”运输发票、其它服务、租赁、建筑安装、餐饮定额发票等)贵公司

在做帐或进销项方面需要到的话，我司可提供全方面的服务。 

    可根据所开数量额度的大小来衡量优惠的点数,并建议长期的合作。郑重

承诺!所用票据均可上网查询或验证后付款！  

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                               电  话  ：13714089426
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[Pyode-user] 489123

[bettylu g. <bet...@in...>]

b8cf3164

Re: [Pyode-user] Frequent Crashes: dInternalStepIsland_x2

[Chris B. <chr...@gm...>]

On 31/07/07, Nathaniel Troutman <loc...@ya...> wrote:
> Hello,
>
> I'm getting frequent crashes from ODE on my mac with this error:
> Exception:  EXC_BAD_ACCESS (0x0001)
> Codes:      KERN_INVALID_ADDRESS (0x0001) at 0xafff6b44
>
> Checking the stack the crashs frequently happen in the function:  dInternalStepIsland_x2
>
> Any clue as to where things might be going wrong?

Maybe running out of stack space? Not sure how big OSX stack size is.
I've never used a Mac so not sure if this will work, but under linux
with bash you can change the stack size with "ulimit -s 16384" (or
higher) from a bash shell before running your code (from the same
shell).

If that doesn't work, your code might be corrupting memory
somewhere... could be anything if you're using C, Python is a bit more
limited (possibly a wrapper bug, possibly something you do in an odd
order - the wrappers aren't bullet proof). Running valgrind with the
python suppressions file should report see any memory issues.
svn.python.org/projects/python/trunk/Misc/valgrind-python.supp

Probably best to update to all the latest versions of ode, pyode to
make sure this but isn't already fixed first.

[Pyode-user] Frequent Crashes: dInternalStepIsland_x2

[Nathaniel T. <loc...@ya...>]

Hello,=0A=0AI'm getting frequent crashes from ODE on my mac with this error=
:=0AException:  EXC_BAD_ACCESS (0x0001)=0ACodes:      KERN_INVALID_ADDRESS =
(0x0001) at 0xafff6b44=0A=0AChecking the stack the crashs frequently happen=
 in the function:  dInternalStepIsland_x2=0A=0AAny clue as to where things =
might be going wrong?=0A=0AThanks,=0ANathaniel=0A=0A=0A=0A=0A       =0A____=
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