Hello. Been working through the opengl superbible samples and have
over fifty of them converted to python.
I'm going mad trying to use tesselation in pyglet, a demonstration in
chapter 10 of the book. I *think* I've worked out an ugly way to get
the callback functions working, but I get an access violation
exception thrown from gluTessEndPolygon. I may be incorrect about my
callback functions working correctly, and that might be the source of
the problem, but I thought I'd see if anyone had some insight.
Traceback (most recent call last):
File "florida.py", line 232, in <module>
pyglet.app.run()
File "c:\Python26\lib\site-packages\pyglet\app\__init__.py", line
264, in run
EventLoop().run()
File "c:\Python26\lib\site-packages\pyglet\app\win32.py", line 74,
in run
self._timer_func(0, 0, timer, 0)
File "c:\Python26\lib\site-packages\pyglet\app\win32.py", line 84,
in _timer_func
sleep_time = self.idle()
File "c:\Python26\lib\site-packages\pyglet\app\__init__.py", line
193, in idle
window.dispatch_event('on_draw')
File "c:\Python26\lib\site-packages\pyglet\window\__init__.py", line
1217, in dispatch_event
EventDispatcher.dispatch_event(self, *args)
File "c:\Python26\lib\site-packages\pyglet\event.py", line 349, in
dispatch_event
getattr(self, event_type)(*args)
File "florida.py", line 146, in on_draw
gluTessEndPolygon(pTess)
WindowsError: exception: access violation writing 0x0027AF8D
The file I've been slavishly hacking on is here:
http://github.com/BenSmith/PythonOpenGLSuperBible4/blob/1440145adf2030dc625adeedb67cb3ceb7805b45/chapt10/florida.py
It won't crash right away, you'll need to press the number 2 or 3 key
on your keyboard to enter the areas of code that use gluTessCallback
and gluTessEndPolygon.
Happy hacking,
-b
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