`NameError: 'GL_V3F' is not defined when using pywavefront with PyOpenGL

[danilorassis]

Issue Description

Environment:

• Operating System: [buntu 22.04.4 LTS]
• Python Version: [3.10.12]
• PyOpenGL Version: [3.1.7]
• pywavefront Version: [1.3.3]

Problem:
I am encountering a NameError when attempting to use the pywavefront library, specifically when it tries to access GL_V3F from PyOpenGL. When execute 3_visualise.py. The exact error message is:

Traceback (most recent call last):
  File "/home/ubuntu/murt/examples/3_visualise.py", line 2, in <module>
    from murt.window import Window
  File "/usr/local/lib/python3.10/dist-packages/murt/window/__init__.py", line 1, in <module>
    from .mwindow as MurtWindow as Window
  File "/usr/local/lib/python3.10/dist-packages/murt/window/mwindow.py", line 8, in <module>
    from pywavefront import visualization, Wavefront, configure_logging
  File "/home/ubuntu/.local/lib/python3.10/site-packages/pywavefront/visualization.py", line 48, in <module>
    'V3F': GL_V3F,
NameError: name 'GL_V3F' is not defined

Steps to Reproduce:

1. Install PyOpenGL and pywavefront via pip.
2. Run a script that initializes an object from pywavefront which triggers the use of OpenGL constants.
3. The script crashes with the mentioned NameError.

Attempts to Resolve:

• I have tried reinstalling both PyOpenGL and pywavefront.
• Checked for any updates or dependency issues with both libraries.
• Attempted to manually define the variable or modify the environment to bypass the error.

None of the above steps have resolved the issue. I suspect there might be an issue with how constants are being imported or used within the PyOpenGL or perhaps a recent update might have altered something.

Expected Outcome:
The script should execute without throwing a NameError and should correctly utilize the constants from PyOpenGL.

Any guidance or recommendations on how to fix this issue would be greatly appreciated. If there is any additional information I can provide, please let me know. Thank you in advance for your help!

[tamsri]

@danilorassis I found a related issue from this dependency package pywavefront/PyWavefront#149. Maybe you can try to reduce your pyglet version to 1.5.x? I haven't checked this project for some time, I will take a look and update some dependencies. :)

[danilorassis]

Hi,

I was facing the error NameError: 'GL_V3F' is not defined when using pywavefront with PyOpenGL. With the community's help, I managed to resolve the issue by following these steps:

1. Uninstalled the current versions of the related libraries:

   pip uninstall pywavefront PyOpenGL pyglet

2. Reinstalled pyglet version 1.5.x:

   pip install pyglet==1.5.21

3. Reinstalled pywavefront and PyOpenGL:

   pip install pywavefront PyOpenGL

After this, I encountered an additional error: FileNotFoundError: [Errno 2] No such file or directory: '/usr/murt-assets/ground.obj'. To resolve this, I checked if the ground.obj file was present in the specified path. Since the file was not in the expected location, I adjusted the path in my Python code to point to the correct location of the file. Here's what I did:

1. Manually checked if the ground.obj file was present in the /usr/murt-assets/ path:

   ls /usr/murt-assets/ground.obj

2. Adjusted the path in the Python code in the file /usr/local/lib/python3.10/dist-packages/murt/window/mwindow.py:

   'ground': Wavefront(os.path.join("/correct/path/to/file/", "ground.obj"), collect_faces=True),

After these modifications, the script worked correctly. I hope this helps others who might be facing similar issues.

Thanks!