Possible bug in render_mesh.py

[Twizwei]

Hi there, thanks for providing the code! I found some possible bugs when I used render_mesh.py.

• Lack of openGL environment. To solve this, I added os.environ['PYOPENGL_PLATFORM'] = 'egl' to the top of the code.
• Delete the render. I met this error because the render is not deleted at each iteration. To solve this, I added r.delete() to the end of each iteration in the for loop.
• Unsorted image list for video generation. In Line 70, the input image list is not sorted. To fix it, change Line 70 to img2video(sorted(glob.glob(f"tmp/{id}/*.png")), f"{outdir}/render.mp4").

[MrTornado24]

Hi, thanks for the correction :)

[FeiiYin]

Another note. In my environment, have to set the environment PYOPENGL_PLATFORM=osmesa . :-(