• Three key concepts that determine how a shader makes a surface react to light are diffusion, reflection, and refraction
• Light rays are reflected or absorbed or pass through a surface.
• Diffusion and reflection are two ways in which light rays bounce off a surface and back into the environment.
• Refraction refers to how a light ray is bent as it passes through a transparent surface.
• Three types of cameras offer different animation controls.

These are the one-, two-, and three-node cameras