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• absorption in the eye
• diffuse reflection
• glossy reflection
• specular reflection
• emission from a light source

Phong Lighting

One surface interaction. Diffuse or glossy.

Ray Tracing

Tracing from the eye. Arbitrary many specular reflections, then one final Phong lighting step.

Radiosity

Only diffuse reflections.

Path Tracing

A series of arbitrary reflections. Then, one final phong lighting step to connect to light source.

Photon Mapping

Arbitrary photon pathes.