Computer Graphics Rendering Paradigms

There are several ways to approach the basic question:
"What should we see on the display screen?"

The Classical Rendering Pipeline:
"How does each polygon appear on the screen?"

"What do we see when we shoot a sampling ray through each pixel?"

"How do the photons from the light source(s) travel around the scene?"

Volume Rendering:
"How do the photons interact with the medium through which they travel?"