What is a 3D graphics programmer?

Question

3D

And one more thing: what is OpenGL and what is it for?

Answer 1

Gl is a hell of a mixture of linear algebra and trigonometry.
At the same time, the concept of working with shaders is incredibly simple - you receive a pixel as input and must return its color back. But there is one peculiarity - this function knows only about one pixel, but knows nothing about neighboring ones. And this feature creates the madness that is going on inside the shader.
Try it, it's interesting to say the least.