Error in OpenGL SurfaceExample: `'Sphere' object has no attribute 'uv_func'`

[phinate]

Hi! I'm running this scene (SurfaceExample) in the OpenGL examples, and I'm unable to create the OpenGLTexturedSurface because the Sphere object is not of type OpenGLSurface and has no uv_func as far as I can see.

This is on manim==0.18.0, Python 3.12, Apple M1. I've tried downgrading manim (and Python) to <0.18, <0.17, since this was shown to be working in this video, but then started running into other issues when the latter installed 0.15.0, so I've abandoned that for now.

Any help would be much appreciated — happy to PR any changes back to the examples!