pyode-user

Re: [Pyode-user] Small bug in Tutorial 3

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

> Hi,
>
> the pyode tuts are a charming way to make first contact, but at tutorial
> three, I wasn't sure exactly _what_ I was seeing, until I replaced
> glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE)
> with
> glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
> for the obvious reasons :-).
>
> Regards,
> Thomas

I don't know if this is related, but I've never been able to get tut3
working (and still can't). On Fedora 7, I get the following error:

Traceback (most recent call last):
  File "/builddir/build/BUILD/Python-2.5/Modules/_ctypes/callbacks.c",
line 206, in 'calling callback function'
  File "ode-tutorial-3.py", line 226, in _drawfunc
    draw_body(b)
  File "ode-tutorial-3.py", line 69, in draw_body
    glPushMatrix()
  File "/usr/lib/python2.5/site-packages/OpenGL/error.py", line 188,
in glCheckError
    baseOperation = baseOperation,
OpenGL.error.GLError: GLError(
        err = 1283,
        description = 'stack overflow',
        baseOperation = glPushMatrix,
        cArguments = ()
)

Re: [Pyode-user] Small bug in Tutorial 3

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

I found the bug, in line 75, in the function:
def draw_body(body):
    """Draw an ODE body.
    """

    x,y,z = body.getPosition()
    R = body.getRotation()
    rot = [R[0], R[3], R[6], 0.,
           R[1], R[4], R[7], 0.,
           R[2], R[5], R[8], 0.,
           x, y, z, 1.0]
    
    glPushMatrix()
    glMultMatrixd(rot)
    
    if body.shape=="box":
        sx,sy,sz = body.boxsize
        glScale(sx, sy, sz)
        glutSolidCube(1)
        
    glPopMatrix()

There is a call to: glScale(sx,sy,sz) there is no glScale, but glScaled and glScalef, note the "d" and "f" at the end of the function name. The illegal function call cause the function to exit without calling glPopMatrix() then the call back _drawfunc() is called which in turn calls draw_body() which calls glPushMatrix() and the process repeats without glPopMatrix() every being called.

Nathaniel






       
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Re: [Pyode-user] Small bug in Tutorial 3

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

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Nathaniel Troutman wrote:
> There is a call to: glScale(sx,sy,sz) there is no glScale, but glScaled and glScalef, note the "d" and "f" at the end of the function name. The illegal function call cause the function to exit without calling glPopMatrix() then the call back _drawfunc() is called which in turn calls draw_body() which calls glPushMatrix() and the process repeats without glPopMatrix() every being called.

Hi,

Thanks for the analysis! A user was having problems with this program
before but I couldn't figure out why.

What version of pyopengl are you running? I'm running 2.0.1.09 and I get:

$ python
Python 2.4.4 (#2, Apr 26 2007, 00:02:45)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import OpenGL.GL
>>> OpenGL.GL.glScale
<built-in function glScaled>
>>> OpenGL.GL.glScaled
<built-in function glScaled>

I'll probably move it to glScaled, but I'm really curious what version
you have that doesn't have this alias in it.

Ethan
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Re: [Pyode-user] Small bug in Tutorial 3

[nick k. <nk...@ze...>]

I saw this when I moved to PyOpenGL 3 which evidently uses ctypes,  
and from my quick perusal of the OpenGL reference, there isn't any  
alias for glScale in the library.

But happily I think this was the only change I had to make in my  
PyOpenGL code when moving to version 3...and the installation was  
_much_ simpler.

nick


On Jul 8, 2007, at 11:06 PM, Ethan Glasser-Camp wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Nathaniel Troutman wrote:
>> There is a call to: glScale(sx,sy,sz) there is no glScale, but  
>> glScaled and glScalef, note the "d" and "f" at the end of the  
>> function name. The illegal function call cause the function to  
>> exit without calling glPopMatrix() then the call back _drawfunc()  
>> is called which in turn calls draw_body() which calls glPushMatrix 
>> () and the process repeats without glPopMatrix() every being called.
>
> Hi,
>
> Thanks for the analysis! A user was having problems with this program
> before but I couldn't figure out why.
>
> What version of pyopengl are you running? I'm running 2.0.1.09 and  
> I get:
>
> $ python
> Python 2.4.4 (#2, Apr 26 2007, 00:02:45)
> [GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import OpenGL.GL
>>>> OpenGL.GL.glScale
> <built-in function glScaled>
>>>> OpenGL.GL.glScaled
> <built-in function glScaled>
>
> I'll probably move it to glScaled, but I'm really curious what version
> you have that doesn't have this alias in it.
>
> Ethan
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.6 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
> iD8DBQFGkaYfhRlgoLPrRPwRAgOtAJ9ufeIxmN8ZgXkOyRIRGXTr7LkFcQCZAalP
> 1v3vI5RvIMQk0y9MFVnYTKo=
> =C9xK
> -----END PGP SIGNATURE-----
>
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Re: [Pyode-user] Small bug in Tutorial 3

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

I'm using PyOpenGL-3.0.0a6 on Mac OSX 10.4.9 

If I import OpenGL.GL this is what I get for the functions from a python terminal
>>> OpenGL.GL.glScale 

Traceback (most recent call last):

  File "<stdin>", line 1, in ?

AttributeError: 'module' object has no attribute 'glScale'

>>> OpenGL.GL.glScaled 
<CFunctionType object at 0x16cece0>
>>> OpenGL.GL.glScalef
<CFunctionType object at 0x16ced50>

So it must be an OpenGL 3 problem as I have a friend at work for whom the PyODE tutorial worked fine, but he was on windows and I don't know what version of PyOpenGL he was using.

Thanks for work, got a question but it should be in a separate message.
Nathaniel





       
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Re: [Pyode-user] Small bug in Tutorial 3

[Diez B. R. <de...@we...>]

On Wednesday 13 June 2007 06:10, Chris Spencer wrote:
> > Hi,
> >
> > the pyode tuts are a charming way to make first contact, but at tutorial
> > three, I wasn't sure exactly _what_ I was seeing, until I replaced
> > glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE)
> > with
> > glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
> > for the obvious reasons :-).
> >
> > Regards,
> > Thomas
>
> I don't know if this is related, but I've never been able to get tut3
> working (and still can't). On Fedora 7, I get the following error:
>
> Traceback (most recent call last):
>   File "/builddir/build/BUILD/Python-2.5/Modules/_ctypes/callbacks.c",
> line 206, in 'calling callback function'
>   File "ode-tutorial-3.py", line 226, in _drawfunc
>     draw_body(b)
>   File "ode-tutorial-3.py", line 69, in draw_body
>     glPushMatrix()
>   File "/usr/lib/python2.5/site-packages/OpenGL/error.py", line 188,
> in glCheckError
>     baseOperation = baseOperation,
> OpenGL.error.GLError: GLError(
>         err = 1283,
>         description = 'stack overflow',
>         baseOperation = glPushMatrix,
>         cArguments = ()
> )

Looks as if the glPushMatrix is missing a glPopMatrix somewhere. Shouldn't be 
too hard to fix, but I don't have the code here.

Diez

Re: [Pyode-user] Small bug in Tutorial 3

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

Diez B. Roggisch wrote:
> On Wednesday 13 June 2007 06:10, Chris Spencer wrote:
>> I don't know if this is related, but I've never been able to get tut3
>> working (and still can't). On Fedora 7, I get the following error:
>>
>> Traceback (most recent call last):
>>   File "/builddir/build/BUILD/Python-2.5/Modules/_ctypes/callbacks.c",
>> line 206, in 'calling callback function'
>>   File "ode-tutorial-3.py", line 226, in _drawfunc
>>     draw_body(b)
>>   File "ode-tutorial-3.py", line 69, in draw_body
>>     glPushMatrix()
>>   File "/usr/lib/python2.5/site-packages/OpenGL/error.py", line 188,
>> in glCheckError
>>     baseOperation = baseOperation,
>> OpenGL.error.GLError: GLError(
>>         err = 1283,
>>         description = 'stack overflow',
>>         baseOperation = glPushMatrix,
>>         cArguments = ()
>> )
> 
> Looks as if the glPushMatrix is missing a glPopMatrix somewhere. Shouldn't be 
> too hard to fix, but I don't have the code here.

In the copies of tutorial3 that I have, there's only one call to 
glPushMatrix and then one to glPopMatrix (lines 69 and 75, 
respectively). The source is at 
http://pyode.sourceforge.net/tutorials/tutorial3.py , and I don't get 
this kind of crash. Chris, where did you get the tutorial from? Does 
it have both PushMatrix and PopMatrix calls?

Ethan