I don't have OpenGL installed.

bahtiyar_a

Don't ask me why you don't have opengl, I have no idea.

Where do I download the OpenGL library for processing?

Thank you.

Lord_of_the_Galaxy

AFAIK, from P3 atleast, there is no OpenGL library. Just use P3D or P2D. They are both OpenGL based renderers.

bahtiyar_a

@Lord_of_the_Galaxy

But when I try to run some code that has OpenGL class in it, it gives me this error

I assume GL2 must be a class in OpenGL library.

Lord_of_the_Galaxy

Now where did you get that code from? It could be possible that the code is for P2 (or even Processing 1) and not P3.

jeremydouglass

@bahtiyar_a

The issue is that if your code declares or assigns an object of type GL2:

GL2 gl;

...then somewhere, either your code or an imported library needs to say:

class GL2 {
  // this is my class
}

This looks like you found some code somewhere and only copied part of it.