pyopengl-users — Discussion of all PyOpenGL matters.

Re: [PyOpenGL-Users] glSelectBuffer problems

[Mike C. F. <mcf...@vr...>]

David Bronke wrote:
> I'm using GL_SELECT to select objects in my application, and I'm
> getting some strange behavior. It seems that the selection buffer is
> never reset, even though I am calling glRenderMode (GL_RENDER) after
> selection, and am calling glSelectBuffer () before each selection.
> Here's my code:
...
>     GL.glRenderMode (mode)
That's the line that should reset the internal counter inside your
OpenGL implementation that determines how many results should be returned:

    An internal index into buffer is reset to 0 whenever selection mode
    is entered. Each time a hit record is copied into buffer, the index
    is incremented to point to the cell just past the end of the block
    of names - that is, to the next available cell. If the hit record is
    larger than the number of remaining locations in buffer, as much
    data as can fit is copied, and the overflow flag is set. If the name
    stack is empty when a hit record is copied, that record consists of
    0 followed by the minimum and maximum depth values.

We do a little bit of custom code, but AFAICS we should not be able to
influence the number of hits returned by the selection buffer (see
OpenGL/GL/selection.py and OpenGL/GL/pointers.py for the actual code). 
That is, when you enter the mode the count should be reset.  When you
exit the mode it returns the internal count.

The buffer remaining the same should *not* be a problem, incidentally,
even if it were.  We copy the reported number of records out of the
buffer, and GL should be writing new records for every record it reports
as having been copied in, so though there might be "garbage" at the end
of the array, it should *not* affect your results or the number of them
reported.
> Any ideas what I'm doing wrong?
It might be easiest to debug if you printed out the names of each
element you are seeing in the buffer.  Stop after the first few frames
and check to see *how* those names are getting added.  If you can
disable the display-list usage (i.e. call the rendering code each time)
you should be able to trace through and see each call to glPushName and
glPopName.  If you are not balancing those two you may be getting a
run-away stack of names that are left on the stacks between runs.  You
could use an assert that GL_NAME_STACK_DEPTH is 0 to be sure you've done
it, if you don't want to disable display lists.

Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com

[PyOpenGL-Users] glSelectBuffer problems

[David B. <whi...@gm...>]

I'm using GL_SELECT to select objects in my application, and I'm getting
some strange behavior. It seems that the selection buffer is never reset,
even though I am calling glRenderMode (GL_RENDER) after selection, and am
calling glSelectBuffer () before each selection. Here's my code:


buffer = self.view.paintGL (GL.GL_SELECT, x, y)
print "Selection returned %d hits:" % (len (buffer), )


where self.view.paintGL is defined as:


def paintGL (self, mode = GL.GL_RENDER, pickX = 0, pickY = 0):
    # Initialize the rendering deleages.
    self.getGeometry ()

    if mode == GL.GL_SELECT:
        # Set up the selection buffer.
        GL.glSelectBuffer (512)

    GL.glRenderMode (mode)

    # Initialize the name stack.
    GL.glInitNames ()
    GL.glPushName (0)

    if self.useDisplayLists:
        # Call the display lists to set up drawing options and
        # transformation matrices.
        GL.glCallList (self.drawOptionsListId)
        GL.glCallList (self.windowTransformListId)
        GL.glCallList (self.userTransformListId)

    if mode == GL.GL_SELECT:
        # Save the current projection matrix.
        GL.glMatrixMode (GL.GL_PROJECTION)
        prevMatrix = GL.glGetDoublev (GL.GL_PROJECTION_MATRIX)

        # Set up the picking matrix.
        viewport = GL.glGetIntegerv (GL.GL_VIEWPORT)
        GL.glLoadIdentity ()
        GLU.gluPickMatrix (pickX, pickY, 3, 3, viewport)
        GL.glMultMatrixd (prevMatrix)

        # Return to MODELVIEW matrix mode.
        GL.glMatrixMode (GL.GL_MODELVIEW)

    # Clear the view to the background color.
    self.qglClearColor (self.colorScheme.background)
    GL.glClear (GL.GL_COLOR_BUFFER_BIT)

    try:
        # Render the scene.
        for delegate in self.delegates:
            delegate.render ()
    except GL.GLerror, inst:
        self.log ("ERROR", str (inst))

    GL.glFlush ()

    if mode == GL.GL_SELECT:
        # Restore the original projection matrix.
        GL.glMatrixMode (GL.GL_PROJECTION)
        GL.glLoadMatrix (prevMatrix)

    if mode != GL.GL_RENDER:
        # Exit selection or feedback mode, and return the
        # selection buffer or the feedback array.
        return GL.glRenderMode (GL.GL_RENDER)


In the above code, self.useDisplayLists is True.
And here's the output from clicking on the same object repeatedly:

Selection returned 32 hits:
Selection returned 34 hits:
Selection returned 36 hits:
Selection returned 38 hits:
Selection returned 40 hits:
<snip>
Selection returned 122 hits:
Selection returned 124 hits:
Selection returned 126 hits:
Selection returned 128 hits:
Traceback (most recent call last):
  File "/home/whitelynx/gne/dbz/widgets/GL3DView.py", line 525, in
mouseReleaseEvent
    handler.click (event.x (), event.y ())
  File "/home/whitelynx/gne/dbz/widgets/ButtonHandlers.py", line 9, in click
    buffer = self.view.paintGL (GL.GL_SELECT, x, y)
  File "/home/whitelynx/gne/dbz/widgets/GL3DView.py", line 213, in paintGL
    return GL.glRenderMode (GL.GL_RENDER)
OpenGL.GL.GLerror: [Errno (1283,)] glSelectBuffer too small to hold
selection results


Any ideas what I'm doing wrong?

-- 
David H. Bronke
Vice President of Project Development
G33X Nexus Entertainment
http://www.g33xnexus.com/

v3sw5/7Hhw5/6ln4pr6Ock3ma7u7+8Lw3/7Tm3l6+7Gi2e4t4Mb7Hen5g8+9ORPa22s6MSr7p6
hackerkey.com
Support Web Standards! http://www.webstandards.org/

[PyOpenGL-Users] GL.glBindTexture, ctypes.ArgumentError

[Darren W. <dar...@gm...>]

I'm using PsychoPy that depends on pyOpenGL.  I'm working on Ubuntu
Gutsy (7.10, amd64) and see the traceback below.  I've also found this
or similar tracebacks with other python code that depends on pyOpenGL,
so I hope this is the right place to ask about it.  Some advice I've
had suggests that libglut3 might be the source of this problem.  As
this is a python traceback (see below), I guess this is the logical
place to look for bugs.  Is this a problem with pyOpenGL?

Thanks in advance, Darren


dweber@skiweber:/data/psychophysics/psychopy$ ./first_stimulus.py
Traceback (most recent call last):
  File "./first_stimulus.py", line 9, in <module>
    grating = visual.AlphaStim(win=mywin, mask="circle", size=3,
pos=[-4,0], sf=3)
  File "/usr/lib/python2.5/site-packages/psychopy/visual.py", line
925, in __init__
    self._setTex(tex)
  File "/usr/lib/python2.5/site-packages/psychopy/visual.py", line
1428, in _setTexNoShaders
    GL.glBindTexture(GL.GL_TEXTURE_1D, self.texID)#bind that name to the target
ctypes.ArgumentError: argument 2: <type 'exceptions.TypeError'>: wrong type
dweber@skiweber:/data/psychophysics/psychopy$

[PyOpenGL-Users] failure on GNU/Linux (Debian) on AMD Duron hardware

[Arthur M. <art...@in...>]

Hi, I have a nearly ten year old PII-266 with Cirrus Logic graphics card 
that runs the Python game "bouncy" under Debian unstable  albeit very 
slowly.

I tried running this on an AMD Duron machine with GForce3 Ti200 graphics 
card and the free "nv" X.org driver, and received the following error. 
The error persisted when using the "vesa" X.org driver.

Any ideas?

Package: bouncy
Version: 0.6.20071104-1
Followup-For: Bug #453287


I upgraded to sid, and still received the same error:

$ bouncy
Traceback (most recent call last):
   File "game.py", line 8, in ?
     from OpenGL.GL import *
   File "/usr/lib/python2.4/site-packages/OpenGL/GL/__init__.py", line 2,
in ?
     from OpenGL.raw.GL import *
   File "/usr/lib/python2.4/site-packages/OpenGL/raw/GL/__init__.py",
line 6, in ?
     from OpenGL.raw.GL.constants import *
   File "/usr/lib/python2.4/site-packages/OpenGL/raw/GL/constants.py",
line 7, in ?
     from OpenGL import platform, arrays
   File "/usr/lib/python2.4/site-packages/OpenGL/platform/__init__.py",
line 24, in ?
     from OpenGL.platform.glx import *
   File "/usr/lib/python2.4/site-packages/OpenGL/platform/glx.py", line
29, in ?
     mode=ctypes.RTLD_GLOBAL
   File
"/usr/lib/python2.4/site-packages/OpenGL/platform/ctypesloader.py", line
37, in loadLibrary
     return dllType( name, mode )
   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 340,
in __init__
     self._handle = _dlopen(self._name, mode)
OSError: GL: cannot open shared object file: No such file or directory

# dpkg -l|grep -i gl|awk '{print $2 " " $3}'
aptitude-doc-en 0.4.9-2
aspell-en 6.0-0-5.1
freeglut3 2.4.0-6
gcompris-sound-en 8.4.2-1
libdbus-glib-1-2 0.74-1
libgl1-mesa-dri 7.0.2-2
libgl1-mesa-glx 7.0.2-2
libgl1-mesa-swx11 7.0.2-2
libgl1-mesa-swx11-i686 7.0.2-2
libglib2.0-0 2.14.4-1
libglib2.0-data 2.14.4-1
libglu1-mesa 7.0.2-2
libtag1c2a 1.4-8+b1
python-opengl 3.0.0~a6-4
xserver-xorg-video-glint 1:1.1.1-8

  grep -v \# xorg.conf |uniq

Section "Files"
EndSection

Section "InputDevice"
         Identifier      "Generic Keyboard"
         Driver          "kbd"
         Option          "CoreKeyboard"
         Option          "XkbRules"      "xorg"
         Option          "XkbModel"      "pc104"
         Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
         Identifier      "Configured Mouse"
         Driver          "mouse"
         Option          "CorePointer"
         Option          "Device"                "/dev/input/mice"
         Option          "Protocol"              "ImPS/2"
         Option          "Emulate3Buttons"       "true"
EndSection

Section "Device"
         Identifier      "nVidia Corporation NV20 [GeForce3 Ti 200]"
         Driver          "nv"
         BusID           "PCI:1:0:0"
EndSection

Section "Monitor"
         Identifier      "Generic Monitor"
         Option          "DPMS"
EndSection

Section "Screen"
         Identifier      "Default Screen"
         Device          "nVidia Corporation NV20 [GeForce3 Ti 200]"
         Monitor         "Generic Monitor"
         DefaultDepth    24
         SubSection "Display"
                 Modes           "1024x768" "832x624" "800x600" "720x400"
"640x480"
         EndSubSection
EndSection

Section "ServerLayout"
         Identifier      "Default Layout"
         Screen          "Default Screen"
         InputDevice     "Generic Keyboard"
         InputDevice     "Configured Mouse"
EndSection


-- System Information:
Debian Release: lenny/sid
   APT prefers unstable
   APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-3-k7 (SMP w/1 CPU core)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages bouncy depends on:
ii  python               2.4.4-6             An interactive high-level 
object-o
ii  python-opengl        3.0.0~a6-4          Python bindings to OpenGL
ii  python-pygame        1.7.1release-4.1+b1 SDL bindings for games 
development
ii  ttf-bitstream-vera   1.10-7              The Bitstream Vera family 
of free

bouncy recommends no packages.

-- no debconf information

[PyOpenGL-Users] failure on GNU/Linux (Debian) on AMD Duron hardware

[Arthur M. <art...@in...>]

Hi, I have a nearly ten year old PII-266 with Cirrus Logic graphics card 
that runs the Python game "bouncy" under Debian unstable  albeit very 
slowly.

I tried running this on an AMD Duron machine with GForce3 Ti200 graphics 
card and the free "nv" X.org driver, and received the following error. 
The error persisted when using the "vesa" X.org driver.

Any ideas?

Package: bouncy
Version: 0.6.20071104-1
Followup-For: Bug #453287


I upgraded to sid, and still received the same error:

$ bouncy
Traceback (most recent call last):
   File "game.py", line 8, in ?
     from OpenGL.GL import *
   File "/usr/lib/python2.4/site-packages/OpenGL/GL/__init__.py", line 2,
in ?
     from OpenGL.raw.GL import *
   File "/usr/lib/python2.4/site-packages/OpenGL/raw/GL/__init__.py",
line 6, in ?
     from OpenGL.raw.GL.constants import *
   File "/usr/lib/python2.4/site-packages/OpenGL/raw/GL/constants.py",
line 7, in ?
     from OpenGL import platform, arrays
   File "/usr/lib/python2.4/site-packages/OpenGL/platform/__init__.py",
line 24, in ?
     from OpenGL.platform.glx import *
   File "/usr/lib/python2.4/site-packages/OpenGL/platform/glx.py", line
29, in ?
     mode=ctypes.RTLD_GLOBAL
   File
"/usr/lib/python2.4/site-packages/OpenGL/platform/ctypesloader.py", line
37, in loadLibrary
     return dllType( name, mode )
   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 340,
in __init__
     self._handle = _dlopen(self._name, mode)
OSError: GL: cannot open shared object file: No such file or directory

# dpkg -l|grep -i gl|awk '{print $2 " " $3}'
aptitude-doc-en 0.4.9-2
aspell-en 6.0-0-5.1
freeglut3 2.4.0-6
gcompris-sound-en 8.4.2-1
libdbus-glib-1-2 0.74-1
libgl1-mesa-dri 7.0.2-2
libgl1-mesa-glx 7.0.2-2
libgl1-mesa-swx11 7.0.2-2
libgl1-mesa-swx11-i686 7.0.2-2
libglib2.0-0 2.14.4-1
libglib2.0-data 2.14.4-1
libglu1-mesa 7.0.2-2
libtag1c2a 1.4-8+b1
python-opengl 3.0.0~a6-4
xserver-xorg-video-glint 1:1.1.1-8

  grep -v \# xorg.conf |uniq

Section "Files"
EndSection

Section "InputDevice"
         Identifier      "Generic Keyboard"
         Driver          "kbd"
         Option          "CoreKeyboard"
         Option          "XkbRules"      "xorg"
         Option          "XkbModel"      "pc104"
         Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
         Identifier      "Configured Mouse"
         Driver          "mouse"
         Option          "CorePointer"
         Option          "Device"                "/dev/input/mice"
         Option          "Protocol"              "ImPS/2"
         Option          "Emulate3Buttons"       "true"
EndSection

Section "Device"
         Identifier      "nVidia Corporation NV20 [GeForce3 Ti 200]"
         Driver          "nv"
         BusID           "PCI:1:0:0"
EndSection

Section "Monitor"
         Identifier      "Generic Monitor"
         Option          "DPMS"
EndSection

Section "Screen"
         Identifier      "Default Screen"
         Device          "nVidia Corporation NV20 [GeForce3 Ti 200]"
         Monitor         "Generic Monitor"
         DefaultDepth    24
         SubSection "Display"
                 Modes           "1024x768" "832x624" "800x600" "720x400"
"640x480"
         EndSubSection
EndSection

Section "ServerLayout"
         Identifier      "Default Layout"
         Screen          "Default Screen"
         InputDevice     "Generic Keyboard"
         InputDevice     "Configured Mouse"
EndSection


-- System Information:
Debian Release: lenny/sid
   APT prefers unstable
   APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-3-k7 (SMP w/1 CPU core)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages bouncy depends on:
ii  python               2.4.4-6             An interactive high-level 
object-o
ii  python-opengl        3.0.0~a6-4          Python bindings to OpenGL
ii  python-pygame        1.7.1release-4.1+b1 SDL bindings for games 
development
ii  ttf-bitstream-vera   1.10-7              The Bitstream Vera family 
of free

bouncy recommends no packages.

-- no debconf information

Re: [PyOpenGL-Users] Newbe question on pyopengl

[Greg E. <gre...@ca...>]

duncan duncan wrote:
> So what are the correct way ? Rotate the object or move the camera ?

There isn't really any difference between these -- they're
just two different ways of thinking about the same thing.
If thinking in terms of rotating the object works for you,
then there's nothing wrong with that.

However, as you develop your application further, you
may find it helpful to think of the object-to-camera
transformation as consisting of two stages:

   1) Transform from object to world coordinates

   2) Transform from world to camera coordinates

Then you can implement operations such as "move the
object along the x axis" by changing the object-to-world
part of the transformation, and not have to worry about
what direction the x axis is pointing relative to the
camera.

Setting up such a 2-stage transformation would go something
like

   glMatrixMode(GL_PROJECTION)
   glLoadIdentity()
   gluPerspective(...) # or gluOrtho for an orthographic projection
   glMatrixMode(GL_MODELVIEW)
   glLoadIdentity()
   gluLookAt(...) # Establish world-to-camera transform
   glMultMatrixd(object_to_world_transform)
   # Render object

Note that gluLookAt is used on the modelview matrix, not
the projection matrix.

--
Greg

[PyOpenGL-Users] Newbe question on pyopengl

[duncan d. <dun...@gm...>]

Hello.

I am playing with pyopengl (and qt) and I have some problems. I am a
newcomer to opengl and pyopengl.

I am able to draw an object and rotato/zoom/move it.
My problem now is that I'd like to draw the object in 4 viewport (no problem
here) but with different point of view.
Basically I am trying to draw the 3 basic orthogonal view (XY, XZ, YZ) and a
perspective view.
I am not interested in a 2D view for the orthogonal projections, since I
will need the full 3D object anyway.

Now I get this simply rotating the object around the axis as I need, but I
am not sure this is the correct thing to do.
Looking around it seems that the correct solution is to move the camera to
have the correct point of view.
So what are the correct way ? Rotate the object or move the camera ?


And if the correct way is to move the camera, where I can find a simple
example ?

My idea is to make something like this:

glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glViewport(0, 0, w, h)
gluLookAt(eyeX, eyeY, eyeZ,
          centerX, centerY, centerZ,
          upX, upY, upZ);
glMatrixMode(GL_MODELVIEW)

and then render my object

but I cannot understand if this is correct and where I must do it.
I suspect that I must do it in the display function, setting the values of
the parameters for gluLookAt in some other places (I am thinking about
the properties
of the viewport)

Is this the correct approach ? If not, where is my error ?

thanks in advance
Gianluca

[PyOpenGL-Users] q - glDrawPixels with YCbCr data?

[David M. <re...@or...>]

Hi all,

I've been developing a python app using the FLTK widgets (via pyFLTK).

A critical part of the app is drawing video frames onto a GL window via
glDrawPixels. (FLTK offers very basic support for GL windows, via its
Fl_GL_Window class).

At the moment, it's working nicely as long as I pass the pixels data in
RGB format. But video editing works mainly with YCbCr format data, and
converting the data into RGB format is very costly for CPU cycles -
takes around 20ms on my 2GHz box.

I've been told on #opengl that there is a way to set up an GL window so
that if passed YCbCr data, it will display with correct colours.

I'm a complete n00b with all things GL, I haven't got weeks to meditate
on the Red Book etc.

Is there a simple straightforward way via PyOpenGL to set up a GL window
so that it can work with YCbCr data passed in via glDrawPixels?

All help appreciated

Cheers
David

[PyOpenGL-Users] OpenGL and orthogonal view on multiple window

[duncan d. <dun...@gm...>]

Hello to everyone.

I am writing an application that should show the same object on
multiple MDI windows (of a Qt Application), which are the classic
orthogonal views.

My idea is to have a common routine to draw the object on the 4
windows (every one has its own opengl view) and then
set the viewport and/or the point of view to look at the object to see
the correct orthogonal view
(for 3 of them, the fourth is not a problem for now).

Is this a good idea or there are other, more suitable, methods ?

thanks in advance
bye
Gianluca

Re: [PyOpenGL-Users] glRectfv ctypes bug?

[altern <al...@gm...>]

sorry, this was on windows XP with python 2.5 and pyopengl3.0.0a6-py2.5.egg

altern(e)k dio:
> hi
> 
> I am porting an old app to the new PyOPenGL and I get an error at
> 
> glRectfv( vlist[0], vlist[2] )
> 
> It says
> 
> "wrappercall types.Argument.Error: ("argument 1: <type 
> 'exceptions.TypeError'>: byref() argument must be ctypes instance, not 
> 'tuple', [(-5.5, -5.5), <OpenGL.arrays.listsc_floatArray_2 object at 
> 0x02x10210>])"
> 
> my bet is that this is a bug because I can replace it by
> 
> glBegin(GL_QUADS)
> glVertex2fv( vlist[0] )
> glVertex2fv( vlist[1] )
> glVertex2fv( vlist[2] )
> glVertex2fv( vlist[3] )
> glEnd()
> 
> and this draws the rect with no errors at all.
> 
> enrike
> 

[PyOpenGL-Users] glRectfv ctypes bug?

[altern <al...@gm...>]

hi

I am porting an old app to the new PyOPenGL and I get an error at

glRectfv( vlist[0], vlist[2] )

It says

"wrappercall types.Argument.Error: ("argument 1: <type 
'exceptions.TypeError'>: byref() argument must be ctypes instance, not 
'tuple', [(-5.5, -5.5), <OpenGL.arrays.listsc_floatArray_2 object at 
0x02x10210>])"

my bet is that this is a bug because I can replace it by

glBegin(GL_QUADS)
glVertex2fv( vlist[0] )
glVertex2fv( vlist[1] )
glVertex2fv( vlist[2] )
glVertex2fv( vlist[3] )
glEnd()

and this draws the rect with no errors at all.

enrike

Re: [PyOpenGL-Users] pyopengl3 and py2exe

[altern <al...@gm...>]

btw. the py2exeeggs.py trick did not work for me, this is why i did this

enrike

altern(e)k dio:
> hi
> 
> i have been trying different ways to get py2exe to create a standalone. 
> Py2exe seems to have problems with the eggs. This is how i got it to 
> work, but I would like to hear if there is some better way to do it.
> 
> first i need to include this at the top of the python file i want to 
> make standalone.
> sys.path.insert(0, os.path.join(sys.prefix, "PyOpenglxxxxxx.egg"))
> sys.path.insert(0, os.path.join(sys.prefix, "setuptoolsxxxxxx.egg"))
> 
> with the right name of the pyopengl and setuptools eggs at site-pakcages
> 
> then I run the setup.py :
> $ python setup.py p2exe -e OpenGL -i 
> ctypes,ctypes.util,weakref,new,distutils.util,logging
> 
> then I must manually copy the PyOpenGL and setuptools eggs to the 
> dist/lib folder in the distribution.
> 
> only after this it does work as standalone. Anyone knows a better solution?
> 
> thanks!
> 
> enrike
> 

[PyOpenGL-Users] pyopengl3 and py2exe

[altern <al...@gm...>]

hi

i have been trying different ways to get py2exe to create a standalone. 
Py2exe seems to have problems with the eggs. This is how i got it to 
work, but I would like to hear if there is some better way to do it.

first i need to include this at the top of the python file i want to 
make standalone.
sys.path.insert(0, os.path.join(sys.prefix, "PyOpenglxxxxxx.egg"))
sys.path.insert(0, os.path.join(sys.prefix, "setuptoolsxxxxxx.egg"))

with the right name of the pyopengl and setuptools eggs at site-pakcages

then I run the setup.py :
$ python setup.py p2exe -e OpenGL -i 
ctypes,ctypes.util,weakref,new,distutils.util,logging

then I must manually copy the PyOpenGL and setuptools eggs to the 
dist/lib folder in the distribution.

only after this it does work as standalone. Anyone knows a better solution?

thanks!

enrike

Re: [PyOpenGL-Users] How to select an object

[Black <py...@bl...>]

It looks like you are generally on the right path, though your  
probably did want to do the selection on mouse down rather than up..  
The error is a misleading one because it has nothing to do with your  
ability to select things. Quite simply, you are trying to return a  
list that doesn't exist. The function processBuffer is the only place  
that self.selected appears, and you never explicitly make it. If you  
just put a self.selected = [] in your init function, your error will  
go away. You still won't be able to select things because you have  
some error in your rendering that I haven't taken the time to track  
down - but that should get you past this particular error...





On Nov 13, 2007, at 11:57 AM, duncan duncan wrote:

> Hello
>
> I am playing with python and pyopengl.
> I have not any problem to draw the object and so on, but then I'd like
> to select an already drawn object.
>
> The code is attached
>
> Running it I get this error:
>
> --------- pick3d ----------
>  - nhits = 0
> hit nothing
>  - selectedObjects:
> Traceback (most recent call last):
>   File "C:\software_personale\openboat\code_snippets\hellogl.py", line
> 143, in mouseReleaseEvent
>     self.pick3d(event)
>   File "C:\software_personale\openboat\code_snippets\hellogl.py", line
> 257, in pick3d
>     return self.processBuffer()
>   File "C:\software_personale\openboat\code_snippets\hellogl.py", line
> 274, in processBuffer
>     print " - selectedObjects: ", self.selected
> AttributeError: selected
>
>
> As you can see, the function is called in the mouseReleaseEvent (O
> also tried the mousePressEvent)
> Any idea (or link) on how I can select an object ? My goal is to be
> able to select a point and drag it around the viewport,
> beeing able to get the new position
>
> Any hints ?
>
> thanks in advance
> bye
> Gianluca<hellogl.py>-------------------------------------------------- 
> -----------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
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> browser.
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> _______________________________________________
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[PyOpenGL-Users] py2exe and egg

[altern <al...@gm...>]

hi

My old py2exe script to create standlone PyOpenGL apps has stoped
working since I started using pyopengl3. As far as I can see the reason
is that it is installed as an egg and not as a directory.

My bet was that I had to exclude OpenGL and manually uncompress the egg
and copy the OpenGL folder to the standalone dist folder but this did
not work for me.

Is there an example or documentation I could check? I have been trying
to find how to do this, I saw some posts in the list, but I think it
would be good to have a simple and clear recipe of how to deal with
this. I would be happy to produce it, if I find the solution.

thanks!

enrike

[PyOpenGL-Users] How to select an object

[duncan d. <dun...@gm...>]

Hello

I am playing with python and pyopengl.
I have not any problem to draw the object and so on, but then I'd like
to select an already drawn object.

The code is attached

Running it I get this error:

--------- pick3d ----------
 - nhits = 0
hit nothing
 - selectedObjects:
Traceback (most recent call last):
  File "C:\software_personale\openboat\code_snippets\hellogl.py", line
143, in mouseReleaseEvent
    self.pick3d(event)
  File "C:\software_personale\openboat\code_snippets\hellogl.py", line
257, in pick3d
    return self.processBuffer()
  File "C:\software_personale\openboat\code_snippets\hellogl.py", line
274, in processBuffer
    print " - selectedObjects: ", self.selected
AttributeError: selected


As you can see, the function is called in the mouseReleaseEvent (O
also tried the mousePressEvent)
Any idea (or link) on how I can select an object ? My goal is to be
able to select a point and drag it around the viewport,
beeing able to get the new position

Any hints ?

thanks in advance
bye
Gianluca

Re: [PyOpenGL-Users] OPENGL

[JoN <jo...@we...>]

Quoting "Mike C. Fletcher" <mcf...@vr...>:

> Actually, ctypes is quite slow compared to e.g. SWIG.  That's because it 
> does a lot more work at run-time for every call than a SWIG or similar 
> system does.  OpenGL-ctypes (PyOpenGL) is even slower because it has to 
> provide the array and similar semantics that aren't available in ctypes' 
> core.
> 

Good gods, is this still the case?

Jon


> Have fun,
> Mike
> 
> -- 
> ________________________________________________
>   Mike C. Fletcher
>   Designer, VR Plumber, Coder
>   http://www.vrplumber.com
>   http://blog.vrplumber.com
> 
> 
> -------------------------------------------------------------------------
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> _______________________________________________
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/pyopengl-users
> 




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Re: [PyOpenGL-Users] "out of memory" - was Re: glut import error bug state

[JoN <jo...@we...>]

This really is a low-traffic list isn't it.  :)


Quoting JoN <jo...@we...>:

> 
> I have a similar problem in an identical environment.
> 
> Python 2.5.1
> PyOpenGL-3.0.0a6
> PyOpenGL-Demo-3.0.0a6
> 
> Windows XP SP2 (Actually, come to think of it....I had no problems before
> SP2!)
> 
> 
> If I run lesson6.py from the NeHe demos (actually it happens on other progs
> including ones I wrote myself that used to work), I get:
> 
> C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-Demo\NeHe
> >lesson6.py
> Hit ESC key to quit.
> Traceback (most recent call last):
>   File "build\bdist.win32\egg\OpenGL\GLUT\special.py", line 107, in safeCall
>     return function( *args, **named )
>   File
> "C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-D
> emo\NeHe\lesson6.py", line 117, in DrawGLScene
>     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # Clear The Screen
> And T
> he Depth Buffer
>   File "build\bdist.win32\egg\OpenGL\error.py", line 188, in glCheckError
>     baseOperation = baseOperation,
> GLError: GLError(
>         err = 1285,
>         description = 'out of memory',
>         baseOperation = glClear,
>         cArguments = (16640,)
> )
> GLUT callback forcing low-level exit on error: GLError(
>         err = 1285,
>         description = 'out of memory',
>         baseOperation = glClear,
>         cArguments = (16640,)
> )
> 
> C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-Demo\NeHe
> >
> 
> 
> Any clues?  Mike?  Anybody?
> 
> 
> Best Regs
> Jon
> 
> 
> 
> 
> 
> Quoting altern <al...@gm...>
> 
> > hi
> > 
> > just upgraded to python 2.5 and pyopengl 3.0.0a6 under XP. Any solutions 
> > to this problem?
> > 
> >
>
http://sourceforge.net/mailarchive/message.php?msg_id=464D0AF5.2080303%40vrplumber.com
> > 
> > I double checked and glut32.dll was installed in c:\windows\system32
> > 
> > thanks
> > 
> > enrike
> > 
> > -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Splunk Inc.
> > Still grepping through log files to find problems?  Stop.
> > Now Search log events and configuration files using AJAX and a browser.
> > Download your FREE copy of Splunk now >>  http://get.splunk.com/
> > _______________________________________________
> > PyOpenGL Homepage
> > http://pyopengl.sourceforge.net
> > _______________________________________________
> > PyOpenGL-Users mailing list
> > PyO...@li...
> > https://lists.sourceforge.net/lists/listinfo/pyopengl-users
> > 
> 
> 
> 
> 
> --------------------------------------------------------------------
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> 
> 
> -------------------------------------------------------------------------
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> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
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> http://pyopengl.sourceforge.net
> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/pyopengl-users
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[PyOpenGL-Users] "out of memory" - was Re: glut import error bug state

[JoN <jo...@we...>]

I have a similar problem in an identical environment.

Python 2.5.1
PyOpenGL-3.0.0a6
PyOpenGL-Demo-3.0.0a6

Windows XP SP2 (Actually, come to think of it....I had no problems before SP2!)


If I run lesson6.py from the NeHe demos (actually it happens on other progs
including ones I wrote myself that used to work), I get:

C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-Demo\NeHe
>lesson6.py
Hit ESC key to quit.
Traceback (most recent call last):
  File "build\bdist.win32\egg\OpenGL\GLUT\special.py", line 107, in safeCall
    return function( *args, **named )
  File "C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-D
emo\NeHe\lesson6.py", line 117, in DrawGLScene
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # Clear The Screen And T
he Depth Buffer
  File "build\bdist.win32\egg\OpenGL\error.py", line 188, in glCheckError
    baseOperation = baseOperation,
GLError: GLError(
        err = 1285,
        description = 'out of memory',
        baseOperation = glClear,
        cArguments = (16640,)
)
GLUT callback forcing low-level exit on error: GLError(
        err = 1285,
        description = 'out of memory',
        baseOperation = glClear,
        cArguments = (16640,)
)

C:\Python25\Lib\site-packages\PyOpenGL_Demo-3.0.0a6-py2.5.egg\PyOpenGL-Demo\NeHe
>


Any clues?  Mike?  Anybody?


Best Regs
Jon





Quoting altern <al...@gm...>

> hi
> 
> just upgraded to python 2.5 and pyopengl 3.0.0a6 under XP. Any solutions 
> to this problem?
> 
>
http://sourceforge.net/mailarchive/message.php?msg_id=464D0AF5.2080303%40vrplumber.com
> 
> I double checked and glut32.dll was installed in c:\windows\system32
> 
> thanks
> 
> enrike
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >>  http://get.splunk.com/
> _______________________________________________
> PyOpenGL Homepage
> http://pyopengl.sourceforge.net
> _______________________________________________
> PyOpenGL-Users mailing list
> PyO...@li...
> https://lists.sourceforge.net/lists/listinfo/pyopengl-users
> 




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Re: [PyOpenGL-Users] PyOpenGL-Users Digest, Vol 16, Issue 4

[Gabriel H. <gas...@ya...>]

I was not able to Install the PyOpenGL package despite the deceiving name used for the script easy_install .

OK, when I run from Windows XP Pro, no service pack, command Prompt:

C:\Python24\Scripts>easy_install-2.4.exe PyOpenGL

the following message is shown.

Searching for PyOpenGL
Best match: PyOpenGL 3.0.0a6
Processing pyopengl-3.0.0a6-py2.4.egg
pyopengl 3.0.0a6 is already the active version

Using c:\python24\lib\site-packages\pyopengl-3
Processing dependencies for PyOpenGL



and the package, I verify at: C:\Python24\Lib\site-packages , is not installed.

Any suggestions?

 __________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

Re: [PyOpenGL-Users] Problem with glXCreatePixmap

[Mike C. F. <mcf...@vr...>]

Jerome Fuselier wrote:
> Hello,
>   I tried to use the glXCreatePixmap method from the GLX package of 
> PyOpenGL but I'm stucked with the needed parameters and don't really 
> find some examples on how to use the python binding.

Your "Xlib" library may have some way of retrieving the display, 
configuration and pixmap pointers (the underlying X pointers, not the 
Python objects).  It will likely return those as integers, and those 
values can be passed to the function.

Hope that helps,
Mike
> >>> from Xlib.display import Display
> >>> from OpenGL.GLX import *
> >>> d = Display()
> >>> root = d.screen().root
> >>> pixmap = root.create_pixmap(256, 256, 8)
> >>> glXCreateWindow(d, cfg, pixmap, 0)

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com

[PyOpenGL-Users] Problem with glXCreatePixmap

[Jerome F. <jer...@fr...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#3333ff">
Hello,<br>
&nbsp; I tried to use the glXCreatePixmap method from the GLX package of
PyOpenGL but I'm stucked with the needed parameters and don't really
find some examples on how to use the python binding.<br>
<br>
I tried to adapt a C code to python but it fails.<br>
<br>
I wanted to do something like that :<br>
<br>
&gt;&gt;&gt; from Xlib.display import Display<br>
&gt;&gt;&gt; from OpenGL.GLX import *<br>
&gt;&gt;&gt; d = Display()<br>
&gt;&gt;&gt; root = d.screen().root<br>
&gt;&gt;&gt; pixmap = root.create_pixmap(256, 256, 8)<br>
&gt;&gt;&gt; glXCreateWindow(d, cfg, pixmap, 0)<tt><br>
</tt><br>
But I got an error like "argument 1: exceptions.TypeError: expected
LP__XDisplay instance instead of instance". I dn't know how I can get
the needed pointer as I am in python.<br>
<br>
I just don't manage to find a good example of how to use the binding :(<br>
<br>
Would anyone have some simple scripts I could have a look at to
understand how it works ?<br>
<br>
The final problem I'm trying to solve is the creation of a bitmap from
a specific window of my x server, to incorporate it as the texture of
an object of a 3D scene, if possible in real-time...<br>
<br>
<br>
If you have some hints to help me it would be great.<br>
<br>
Thanks,<br>
&nbsp; J&eacute;r&ocirc;me<br>
<tt></tt>
</body>
</html>

[PyOpenGL-Users] OpenGL Error

[<sh...@lo...>]

Hi again,

I think I may have fixed my earlier error by changing my Python path
(again), but now I get another error.  Again, this software works on a
different Linux system, but I'm having trouble with it on this one.  Does
anyone have any ideas for me?

Thanks again!
Shari

Here is the error message:

============================================
Traceback (most recent call last):
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/wxGui.py",
line 72, in <module>
    vizApp = VizApp()
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/wxGui.py",
line 10, in __init__
    wx.App.__init__(self, redirect=False)
  File "/usr/lib/python2.5/site-packages/wx-2.8-gtk2-ansi/wx/_core.py",
line 7818, in __init__
    self._BootstrapApp()
  File "/usr/lib/python2.5/site-packages/wx-2.8-gtk2-ansi/wx/_core.py",
line 7415, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/wxGui.py",
line 33, in OnInit
    self.win = mainWindow.mainWindow(frame)
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/mainWindow.py",
line 30, in __init__
    self.navigationWin.setPosition(navigationWindow.Position(0, 0))
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/navigationWindow.py",
line 163, in setPosition
    self.gallery.LookAt(self.position.x, self.position.z)
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/gallery.py",
line 145, in LookAt
    billboardX, billboardY, billboardZ)
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/gallery.py",
line 130, in SetPosition
    self.OnDraw()
  File
"/home/shari/workspace/VisualizationGallery20071022/src/gui/gallery.py",
line 115, in OnDraw
    glCallList(self.billboardList)
  File "build/bdist.linux-i686/egg/OpenGL/error.py", line 188, in
glCheckError
OpenGL.error.GLError: GLError(
	err = 1281,
	description = 'invalid value',
	baseOperation = glCallList,
	cArguments = (1L,)
)
============================================

And here is the offending class:
============================================
#!/usr/bin/env python2.4

import wx
import os
import Image
import glMethods
import  wx.lib.scrolledpanel as scrolled
import wx.lib.statbmp as statbmp
import wx.lib.buttons as buttons
from wx import glcanvas
from vtk.wx.wxVTKRenderWindow import *
from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *

import vizGenerator.vizEngine

MAP_FILE_NAME = "/home/shari/thesisFiles/testSet.cod"
DATA_FILE_NAME  = "/home/shari/thesisFiles/schoolData.vtk"
MAX_HISTORY_SIZE = 1000

class myGLWindow(glcanvas.GLCanvas):
    def __init__(self, parent):
        glcanvas.GLCanvas.__init__(self, parent, -1)
        print "In myGLWindow.__init__"
        self.init = False

        # initial mouse position
        self.lastx = self.x = 30
        self.lasty = self.y = 30
        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseDown)
        self.Bind(wx.EVT_LEFT_UP, self.OnMouseUp)
        self.Bind(wx.EVT_MOTION, self.OnMouseMotion)

        self.InitGL()

    def OnEraseBackground(self, event):
        pass # Do nothing, to avoid flashing on MSW.


    def OnSize(self, event):
        print "In myGLWindow.OnSize"
        self.SetCurrent()
        size = self.GetClientSize()
        if self.GetContext():
            self.SetCurrent()

        if (True):
            if (size.height == 0):
                size.height = 1  # prevent divide by 0
            glViewport(0, 0, size.width, size.height)

            glMatrixMode(GL_PROJECTION)
            glLoadIdentity()

            # Calculate the aspect ratio of the window
#            gluPerspective(80.0, float(size.width) / float(size.height),
#                           1.0, 50.0)
            glMatrixMode(GL_MODELVIEW)
            glLoadIdentity()
        #self.SwapBuffers()
        self.OnDraw()
        event.Skip()


    def OnPaint(self, event):
        dc = wx.PaintDC(self)
        self.SetCurrent()
        if not self.init:
            self.InitGL()
            self.init = True
        self.OnDraw()


    def OnMouseDown(self, evt):
        self.CaptureMouse()


    def OnMouseUp(self, evt):
        self.ReleaseMouse()


    def OnMouseMotion(self, evt):
        if evt.Dragging() and evt.LeftIsDown():
            self.x, self.y = self.lastx, self.lasty
            self.x, self.y = evt.GetPosition()
            self.Refresh(False)

class Gallery(myGLWindow):
    vizImageIds = []
    #global myVizEngine
    xMapSize = 0
    yMapSize = 0
    width = 1.0    # Length of a billboard
    height = 1.0    # Height of a billboard
    distX = 1.0  # Distance between billboards in the x direction
    distZ = 1.5  # Distance between billboards in the z direction

    myVizEngine = vizGenerator.vizEngine.vizEngine(MAP_FILE_NAME,
DATA_FILE_NAME)
    xMapSize = int(myVizEngine.mapMatrix.sizeX)
    yMapSize = int(myVizEngine.mapMatrix.sizeY)

    billboardList = 0

    def getVizEngine(self):
        return self.myVizEngine

    def OnDraw(self):
        print "In Gallery.OnDraw"
        self.SetCurrent()
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
        glCallList(self.billboardList)
        glFlush()

        self.SwapBuffers()

    def SetPosition(self, camX, camY, camZ, viewX, viewY, viewZ):
       """Sets the viewpoint at which to look
           Called when the user moves from one location to another"""
       print "In Gallery.SetPosition"
       self.SetCurrent()
       # Viewing transformation
       glLoadIdentity()
       gluLookAt(camX, camY, camZ, # camera position
                 viewX, viewY, viewZ , # camera aimed at
                 0.0, 1.0, 0.0) # view-up matrix
       self.OnDraw()
       #self.SwapBuffers()

    def LookAt(self, x, z):
        """Positions the camera and viewpoint to look at the billboard
            at array position (x, z)"""
        print "Looking at position: ", x, z
        self.SetCurrent()
        billboardX = x * (self.distX + self.width) + self.width / 2
        billboardY = 0.5
        billboardZ = (z - 1) * self.distZ
        camX = billboardX
        camY = billboardY
        camZ = billboardZ - (self.distZ / 3)
        self.SetPosition(camX, camY, camZ,
                         billboardX, billboardY, billboardZ)
        #self.OnDraw()
        #self.SwapBuffers()

    def DrawBillboard(self, x, y, z, filename, textureCount):
        self.textureId = self.LoadImage(filename, textureCount)
        self.SetupTexture(textureCount)
        glBindTexture(GL_TEXTURE_2D, self.vizImageIds[textureCount]) #
Added 20061003

        glBegin(GL_QUADS)

        leftX = x * (self.distX + self.width)
        rightX = leftX + self.width
        bottomY = y
        topY = y + self.height
        z = z * self.distZ

        glNormal3f(0.0, 0.0, -1.0)
        glTexCoord2f(0.0, 0.0); glVertex3f(leftX, bottomY, z)
        glTexCoord2f(1.0, 0.0); glVertex3f(rightX, bottomY, z)
        glTexCoord2f(1.0, 1.0); glVertex3f(rightX, topY, z)
        glTexCoord2f(0.0, 1.0); glVertex3f(leftX, topY, z)
        #glTexCoord2f(0.0, 0.0); glVertex3f(leftX, bottomY, z)
        #glTexCoord2f(0.0, 1.0); glVertex3f(leftX, topY, z)
        #glTexCoord2f(1.0, 1.0); glVertex3f(rightX, topY, z)
        #glTexCoord2f(1.0, 0.0); glVertex3f(rightX, bottomY, z)

        glEnd()

    def SetupTexture(self, textureId):
        glEnable(GL_TEXTURE_2D)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)

        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)

        #glBindTexture(GL_TEXTURE_2D, self.vizImageIds[textureId]) # Added
20061003

    def LoadImage(self, filename, id):
        # First, load bitmap
        if filename == None:
            return None
        textureImageFile = None
        textureImageFile = open(filename, 'r')
        if textureImageFile:
            textureImageFile.close()
            im = Image.open(filename)
            try:
                ix, iy, image = im.size[0], im.size[1], im.tostring("raw",
"RGBA", 0, -1)
            except SystemError:
                ix, iy, image = im.size[0], im.size[1], im.tostring("raw",
"RGBX", 0, -1)

        glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
        glTexImage2D(GL_TEXTURE_2D, 0, 3, ix, iy, 0, GL_RGBA,
GL_UNSIGNED_BYTE, image)
        return self.vizImageIds[id]

    def CreateDisplayList(self):
        print "In Gallery.CreateDisplayList"
        self.billboardList = glGenLists(1)
        glNewList(self.billboardList, GL_COMPILE)
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        # Draw a matrix of billboards
        #glBegin(GL_QUADS)
        textureCount = 0

        for x in range(0, self.xMapSize):
            for z in range(0, self.yMapSize):
                textureFilename = self.myVizEngine.getViz([x, z])
                y = 0
                self.DrawBillboard(x, y, z, textureFilename, textureCount)
                textureCount += 1

        #glEnd()

        self.LookAt(0, 0)
        #self.LookAt(0, 0)
        glEndList()


    def InitGL(self):
        print "In Gallery.InitGL"
        self.SetCurrent()
        glClearColor(0.7, 0.7, 0.7, 0.0)
        glShadeModel(GL_FLAT)
        glEnable(GL_DEPTH_TEST)

        glMatrixMode(GL_MODELVIEW)    # Following commands affect model
        glLoadIdentity()

        self.vizImageIds = glGenTextures(self.xMapSize * self.yMapSize + 1)
        self.CreateDisplayList()
        #self.LookAt(0, 0)
        #self.OnDraw()
        #self.SwapBuffers()

    def FinishGL(self):
        pass

class HistoryView(scrolled.ScrolledPanel):
    SPACING = 1

    def __init__(self, parent, navigationWin):
        #wx.ScrolledWindow.__init__(self, parent, id=-1,
pos=wx.DefaultPosition,
        #                           size=(700, 100), style=wx.HSCROLL,
        #                           name="History View")
        scrolled.ScrolledPanel.__init__(self, parent, -1, size=(840, 200))
        #self.SetSize((700, 100))
        #self.panel = wx.Panel(self, style=wx.BORDER_SUNKEN, size=(700, 100))
        self.navigationWin = navigationWin
        self.history = navigationWin.history
        self.boxSizer = wx.BoxSizer(wx.HORIZONTAL)
        self.myVizEngine = vizGenerator.vizEngine.vizEngine(MAP_FILE_NAME,
DATA_FILE_NAME)

        #self.OnDraw()
        #self.SetSizerAndFit(self.boxSizer)
        self.SetSizer(self.boxSizer)

        self.SetupScrolling(scroll_x=True)
        self.FitInside()

#    def OnDraw(self):
#        for x in range(0, self.history.getLength()):
#            currPos = self.history.getPosition(x)
#            textureFilename = myVizEngine.getViz([currPos.x, currPos.z])
#            image = wx.Image(textureFilename, wx.BITMAP_TYPE_BMP)
#            width = image.GetWidth()
#            height = image.GetHeight()
#            print "Image Size: ", width, height
#            scaledImage = image.Scale(width * self.SCALE_FACTOR, height *
self.SCALE_FACTOR)
#            #staticBitmap = wx.StaticBitmap(self.panel, -1,
wx.BitmapFromImage(scaledImage))
#            staticBitmap = wx.StaticBitmap(self, -1,
wx.BitmapFromImage(scaledImage))
#            self.boxSizer.Add(staticBitmap, 0, wx.ALL, self.SPACING)
#
#        #self.Fit()
#        self.FitInside()

    def AddPosition(self, position):
        #currPos = self.history.getPosition(self.history.length - 1)
        #staticBitmap = wx.StaticBitmap(self, -1,
wx.BitmapFromImage(scaledImage))
        #staticBitmap = statbmp.GenStaticBitmap(self, wx.ID_ANY, scaledImage)
        historyButton = HistoryButton(self, position, self.myVizEngine)
        self.boxSizer.Add(historyButton, 0, wx.ALL, self.SPACING)
        self.FitInside()
        #size = self.GetVirtualSize()
        #self.Scroll(size[0], self.yPos)

#    def OnClick(self, event):
        #print "Image: was clicked at %i, %i " % (event.GetX(), event.GetY())


class HistoryButton(buttons.GenBitmapButton):
    SCALE_FACTOR = 0.5

    def __init__(self, parent, position, vizEngine):
        self.position = position
        self.parent = parent
        textureFilename = vizEngine.getViz([position.x, position.z])
        image = wx.Image(textureFilename, wx.BITMAP_TYPE_BMP)
        #image = wx.Bitmap(textureFilename)
        width = image.GetWidth()
        height = image.GetHeight()
        #print "Image Size: ", width, height
        scaledImage = image.Scale(width * self.SCALE_FACTOR, height *
self.SCALE_FACTOR)
        bitmapImage = scaledImage.ConvertToBitmap()
        buttons.GenBitmapButton.__init__(self, parent, -1, bitmapImage,
pos=(0, 0), style=0)
        self.Bind(wx.EVT_BUTTON, self.OnClick, self)


    def OnClick(self, event):
        self.parent.navigationWin.setPosition(self.position)

#class HistoryView(myGLWindow):
#    textureImageIds = []
#
#    def __init__(self, parent, history):
#        self.history = history
#        myGLWindow.__init__(self, parent)
#        self.OnDraw()
#
#    def OnDraw(self):
#        print "Drawing history view"
#        self.SetCurrent()
#        # clear color and depth buffers
#        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#
#        for x in range(0, self.history.getLength()):
#            currPos = self.history.getPosition(x)
#            textureFilename = myVizEngine.getViz([currPos.x, currPos.z])
#
#            self.textureId = self.LoadImage(textureFilename, x)
#            self.SetupTexture(x)
#
#            leftX = 1.5 * x
#            rightX = 1.5 * x + 1
#            bottomY = 0
#            topY = 1
#            z = 0
#
#            glBegin(GL_QUADS)
#            glTexCoord2f(0.0, 0.0); glVertex3f(leftX, bottomY, z)
#            glTexCoord2f(1.0, 0.0); glVertex3f(rightX, bottomY, z)
#            glTexCoord2f(1.0, 1.0); glVertex3f(rightX, topY, z)
#            glTexCoord2f(0.0, 1.0); glVertex3f(leftX, topY, z)
#            glEnd()
#
#        glLoadIdentity()
#        gluLookAt(2.5, 0.5, 1.0, # camera position
#                  2.5, 0.5, 0.0,  # camera aimed at
#                  0.0, 1.0, 0.0)  # view-up matrix
#
#        self.SwapBuffers()
#
#    def InitGL(self):
#        #print "In InitGL for History View"
#        self.SetCurrent()
#        glClearColor(0.7, 0.7, 0.7, 0.0)
#        glShadeModel(GL_FLAT)
#        glEnable(GL_DEPTH_TEST)
#
#        glMatrixMode(GL_MODELVIEW)    # Following commands affect model
#        glLoadIdentity()
#
#        self.textureImageIds = glGenTextures(MAX_HISTORY_SIZE)
#        self.SwapBuffers()
#
#    def LoadImage(self, filename, id):
#        self.SetCurrent()
#        # First, load bitmap
#        if filename == None:
#            return None
#        textureImageFile = None
#        textureImageFile = open(filename, 'r')
#        if textureImageFile:
#            textureImageFile.close()
#            im = Image.open(filename)
#            try:
#                ix, iy, image = im.size[0], im.size[1],
im.tostring("raw", "RGBA", 0, -1)
#            except SystemError:
#                ix, iy, image = im.size[0], im.size[1],
im.tostring("raw", "RGBX", 0, -1)
#
#        glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
#        glTexImage2D(GL_TEXTURE_2D, 0, 3, ix, iy, 0, GL_RGBA,
GL_UNSIGNED_BYTE, image)
#        self.SwapBuffers()
#        return self.textureImageIds[id]
#
#    def SetupTexture(self, textureId):
#        self.SetCurrent()
#        glEnable(GL_TEXTURE_2D)
#        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
#        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
#        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
#        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
#
#        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
#
#        glBindTexture(GL_TEXTURE_2D, self.textureImageIds[textureId]) #
Added 20061003
#        self.SwapBuffers()
#
class CurrentView(wx.Panel):
    def __init__(self, parent):
        self.position = [0, 0]

        wx.Panel.__init__(self, parent, style=wx.BORDER_SUNKEN, size=(60,
200))

        box = wx.BoxSizer(wx.VERTICAL)

        self.widget = wxVTKRenderWindow(self, -1, pos=(100, 100),
size=(170, 170))
        myVizEngine = vizGenerator.vizEngine.vizEngine(MAP_FILE_NAME,
DATA_FILE_NAME)
        ren = myVizEngine.getVtkViz(self.position)

        self.widget.GetRenderWindow().AddRenderer(ren)

        box.Add(self.widget, 0, wx.ALIGN_RIGHT)
        self.SetSizer(box)

    def SetPosition(self, position):
        self.position = position

    def OnDraw(self):
        self.widget = wxVTKRenderWindow(self, -1, pos=(100, 100),
size=(170, 170))
        myVizEngine = vizGenerator.vizEngine.vizEngine(MAP_FILE_NAME,
DATA_FILE_NAME)
        ren = myVizEngine.getVtkViz(self.position)

        self.widget.GetRenderWindow().AddRenderer(ren)
============================================

[PyOpenGL-Users] PyOpenGL Problem

[<sh...@lo...>]

Hello,

I'm having trouble with a PyOpenGL application that I'm trying to run. 
I'm hoping it's a configuration error.  Here is the error I get:

============================================
(python:3903): Gdk-WARNING **: gdkdrawable-x11.c:878 drawable is not a
pixmap or window

(python:3903): Gdk-WARNING **: gdkdrawable-x11.c:878 drawable is not a
pixmap or window
The program 'python' received an X Window System error.
This probably reflects a bug in the program.
The error was 'GLXBadDrawable'.
  (Details: serial 286 error_code 156 request_code 143 minor_code 11)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
==============================================

When I instantiate the an object of type Gallery (the class definition is
shown below), I get this error.  The same code runs fine on another Linux
computer, and I have another program on this system that creates a similar
class (a child of glcanvas.GLCanvas) and works fine, and I absolutely
cannot figure out the difference between the two.  Does anyone have any
ideas for me?

Thank you very much in advance - I have been tearing out my hair trying to
solve this problem.

Shari

Here is the class that seems to cause the problem:

===============================================
import wx
from wx import glcanvas

import Image

from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *

class myGLCanvas(glcanvas.GLCanvas):
    def __init__(self, parent):
        glcanvas.GLCanvas.__init__(self, parent, -1)
        self.init = False

        # initial mouse position
        self.lastx = self.x = 30
        self.lasty = self.y = 30
        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseDown)
        self.Bind(wx.EVT_LEFT_UP, self.OnMouseUp)
        self.Bind(wx.EVT_MOTION, self.OnMouseMotion)

        self.InitGL()

    def OnEraseBackground(self, event):
        pass # Do nothing, to avoid flashing on MSW.


    def OnSize(self, event):
        self.SetCurrent()
        size = self.GetClientSize()
        if self.GetContext():
            self.SetCurrent()

        if (True):
            if (size.height == 0):
                size.height = 1  # prevent divide by 0

            glViewport(0, 0, size.width, size.height)

            glMatrixMode(GL_PROJECTION)
            glLoadIdentity()

            # Calculate the aspect ratio of the window
            gluPerspective(80.0, float(size.width) / float(size.height),
                           1.0, 50.0)

            glMatrixMode(GL_MODELVIEW)
            glLoadIdentity()
        self.OnDraw()
        event.Skip()


    def OnPaint(self, event):
        dc = wx.PaintDC(self)
        self.SetCurrent()
        if not self.init:
            self.InitGL()
            self.init = True
        self.OnDraw()


    def OnMouseDown(self, evt):
        self.CaptureMouse()


    def OnMouseUp(self, evt):
        self.ReleaseMouse()


    def OnMouseMotion(self, evt):
        if evt.Dragging() and evt.LeftIsDown():
            self.x, self.y = self.lastx, self.lasty
            self.x, self.y = evt.GetPosition()
            self.Refresh(False)

class Gallery(myGLCanvas):
    SIZE_X = 1.0
    SIZE_Y = 1.0
    DIST_X = 0.5
    DIST_Z = 1.0
    BOTTOM_Y = -0.5

    # TODO:  Change this after I get it working
    xMapSize = 1
    yMapSize = 2


    def InitGL(self):
        print "In InitGL"
        self.SetCurrent()
        glClearColor(0.7, 0.7, 0.7, 0.0)
        glShadeModel(GL_FLAT)

        glutInitDisplayMode(GLUT_DEPTH)

        glEnable(GL_ALPHA_TEST)
        glEnable(GL_DEPTH_TEST)
        glEnable(GL_LIGHTING)
        glEnable(GL_LIGHT0)

        glMatrixMode(GL_MODELVIEW)    # Following commands affect model
        glLoadIdentity()

        # Generate a set of textures to use
        self.vizImageIds = glGenTextures(self.xMapSize * self.yMapSize + 1)
        self.billboardList = 0
        self.CreateDisplayList()
        self.OnDraw()

    def OnDraw(self):
        self.SetCurrent()
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
        glCallList(self.billboardList)
        glFlush()

        glLoadIdentity()
#        gluLookAt( 1.0, 0.0, -0.5, # camera position
#                   1.0, 0.0, 1.0, # camera aimed at
#                   0.0, 1.0, 0.0) # view-up matrix

        self.SwapBuffers()

    def DrawBillboard(self, x, z, filename, textureCount):
        self.textureId = self.LoadImage(filename, textureCount)
        self.SetupTexture(textureCount)
        glBindTexture(GL_TEXTURE_2D, self.vizImageIds[textureCount]) #
Added 20061003

        glBegin(GL_QUADS)

        leftX = x * (self.SIZE_X + self.DIST_X)
        rightX = leftX + self.SIZE_X
        bottomY = self.BOTTOM_Y
        topY = bottomY + self.SIZE_Y
        zVal = z * self.DIST_Z + 1.0
        print "zVal = ", zVal

        glNormal3f(0.0, 0.0, 1.0)
        glTexCoord2f(1.0, 1.0); glVertex3f(rightX, topY, zVal)
        glTexCoord2f(0.0, 1.0); glVertex3f(leftX, topY, zVal)
        glTexCoord2f(0.0, 0.0); glVertex3f(leftX, bottomY, zVal)
        glTexCoord2f(1.0, 0.0); glVertex3f(rightX, bottomY, zVal)

        glEnd()

    def LoadImage(self, filename, id):
        # First, load bitmap
        if filename == None:
            return None
        textureImageFile = None
        textureImageFile = open(filename, 'r')
        if textureImageFile:
            textureImageFile.close()
            im = Image.open(filename)
            try:
                ix, iy, image = im.size[0], im.size[1], im.tostring("raw",
"RGBA", 0, -1)
            except SystemError:
                ix, iy, image = im.size[0], im.size[1], im.tostring("raw",
"RGBX", 0, -1)

        glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
        glTexImage2D(GL_TEXTURE_2D, 0, 3, ix, iy, 0, GL_RGBA,
GL_UNSIGNED_BYTE, image)
        return self.vizImageIds[id]

    def SetupTexture(self, textureId):
        glEnable(GL_TEXTURE_2D)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)

        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)

    def CreateDisplayList(self):
        self.billboardList = glGenLists(1)
        glNewList(self.billboardList, GL_COMPILE)
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        # Draw a matrix of billboards
        textureCount = 0

        for x in range(0, self.xMapSize):
            for z in range(0, self.yMapSize):
                #textureFilename = self.myVizEngine.getViz([x, z])
                textureFilename = "/home/shari/thesisFiles/TestFileName.bmp"
                textureCount = 0
                self.DrawBillboard(x, z, textureFilename, textureCount)
                textureCount += 1

        glEndList()

Re: [PyOpenGL-Users] pygamefont problem

[Mike C. F. <mcf...@vr...>]

vwf wrote:
> Hello,
>
> I have a rather old problem that fails to work after upgrading. The
> problem is that font-rendering does not work correctly. The result looks
> like the a television that lost horizontal sync.
>
> I think I use old code, but I don't know what is wrong. I include a
> small programme that works, but displays incorrectly (it is a Q&D cut
> from my real programme). Any suggestions, or a pointer to an example I
> can use?
>   
PyGame fonts require an axis swap sometimes.  Honestly I normally just 
try both flipped and un-flipped, exchanging x and y and not, and the 
combination that looks right is the one I use.  You seem to be using a 
package I'm not familiar with:
> from pygamefont import *
>   
so I'm afraid I don't have any particular help to offer, though I'd 
suggest trying a flip and/or an x/y coordinate swap of the images.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com