Photon Mapping

Photon Mapping

Photon Mapping is a rendering algorithm that lets designers create images with realistic lighting by simulating the way light bounces around a scene. This method uses two steps: first, it sends out many small packets of light, called photons, from a light source into the scene, and saves where these photons hit surfaces. In the second step, the algorithm uses this saved information to figure out how bright and what color each part of the scene should be. Designers can use Photon Mapping to show effects like soft shadows, color bleeding, and caustics, which are the bright patterns made when light shines through glass or water. Photon Mapping is especially good for scenes with glass, water, or shiny surfaces, because it can show how light bends and spreads in these materials.

rendering algorithm global illumination caustics light simulation indirect lighting surface interaction photorealistic rendering

— Kevin Green