Cannot import tk3dv since OpenGL's location has changed in macOS Big Sur

[apugoneappu]

In macOS Big Sur, the location of OpenGL has changed and thus the regular import does not work (on my system). I am checking if the issue has been fixed on newer python versions.
Current python version: 3.7.9

Related PR - python/cpython#21241

Python 3.7.9 (default, Aug 31 2020, 07:22:35)
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import tk3dv
Traceback (most recent call last):
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/darwin.py", line 38, in GL
    mode=ctypes.RTLD_GLOBAL
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/ctypesloader.py", line 36, in loadLibrary
    return _loadLibraryWindows(dllType, name, mode)
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/ctypesloader.py", line 89, in _loadLibraryWindows
    return dllType( name, mode )
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/ctypes/__init__.py", line 364, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: ('dlopen(OpenGL, 10): image not found', 'OpenGL', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/tk3dv/__init__.py", line 1, in <module>
    import tk3dv.common
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/tk3dv/common/__init__.py", line 8, in <module>
    import utilities, drawing, defines
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/tk3dv/common/./drawing.py", line 1, in <module>
    import OpenGL.GL as gl
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL import error as _error
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/error.py", line 12, in <module>
    from OpenGL import platform, _configflags
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/__init__.py", line 36, in <module>
    _load()
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/__init__.py", line 33, in _load
    plugin.install(globals())
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/baseplatform.py", line 97, in install
    namespace[ name ] = getattr(self,name,None)
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/darwin.py", line 62, in GetCurrentContext
    return self.CGL.CGLGetCurrentContext
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/darwin.py", line 45, in CGL
    def CGL(self): return self.GL
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/darwin.py", line 41, in GL
    raise ImportError("Unable to load OpenGL library", *err.args)
ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)

[apugoneappu]

A temporary fix I found was to change a line in the file OpenGL/platform/ctypesloader.py from

fullName = util.find_library( name )

to

fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'

For my Anaconda python, the ctypesloader.py file was located in /Users/apoorve/anaconda3/envs/adven/lib/python3.7/site-packages/OpenGL/platform/ctypesloader.py.

Source - StackOverflow Solution

[apugoneappu]

@drsrinathsridhar I feel it would be good to document this issue. Is there any place where documentation is being made?

Update - I added a new Issues section to the Readme and linked to this solution.