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From Odwiki

A Photon Map is a data structure which stores Photons. The photons are stored in a data structure which allows for easy evaluation of the nearest K photons to a point in space. The Photon Map can be used to estimate the LightPaths for indirect diffuse and indirect specular light transport.

Houdini provides a commandline tool called i3dconvert which allows the user to generate a .bgeo file of a point cloud representing where these photons have landed.

See Also

• PhotonMapping