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Mastering mental ray®: Rendering Techniques for 3D & CAD Professionals by Jennifer O'Connor

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Chapter 7. Importons and Irradiance Particles

Importons and Irradiance Particles are two relatively new indirect illumination technologies in mental ray. The term Importons is short for "importance photons" and is a technology that minimizes Global Illumination data based on how important a rendered area is to the illumination of the final image. Importons allow you to emit more photons into your scene; they keep just the photons you need for your image to reduce the memory requirements that high photon numbers might require.

Importons also work with the next technology, Irradiance Particles. Unlike the other indirect illumination technologies, irradiance particles calculate direct and indirect illumination for every particle. Importons determine ...

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