dense class.

notes:

Getting graphics onto the screen is called rendering.

OpenGL Core (or simply OpenGL) is the original graphics library which runs on desktop computers. OpenGL ES is a variant specifically for embedded systems (e.g. mobile phones). The library is a subset of OpenGL Core. WebGL is a variant specifically for web browsers, and is based on OpenGL ES.

understood that transformation values are increments, not coordinates. aditya mentioned this.
you can do multiple push-pops. this is called stacking. each ‘layer’ is additive without it. for example:

translate (0,0,1)
//whatever
 
translate (1,1,0)
//this is actually the sum of both translates; i.e. the z is already translated by +1.

vertices can store multiple data. like, in this sketch by elias (elie) zananiri, each vertex for a triangle shape holds color information. pixels in between are linearly interpolated.

elias (elie) zananiri then made us try to make quads with triangles, which was a bit of a pain to get working.