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Precomputed Radiance Transfer (PRT) is a computer graphics technique used to render a scene in real time with complex light interactions being precomputed to save time. Radiosity methods can be used to determine the diffuse lighting of the scene, however PRT offers a method to dynamically change the lighting environment. In essence, PRT computes the illumination of a point as a linear combination of incident irradiance. An efficient method must be used to encode this data, such as spherical harmonics.

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  • Precomputed Radiance Transfer (PRT) ist eine Technik in der Computergrafik, die eingesetzt wird, um eine Szene mit komplexen Lichtinteraktionen in Echtzeit rendern zu können. Dabei stützt sie sich auf Beleuchtungsinformationen, die einmalig berechnet und zur Laufzeit lediglich ausgewertet werden. PRT berechnet die Helligkeit eines Punktes durch Linearkombination von einfallender Lichtstrahlung, die durch geeignete Funktionen kodiert ist. Greger liefert eine erste Einführung in das Thema, Sloan, Kautz und Snyder verwenden erstmals Kugelflächenfunktionen, um die Helligkeitsinformationen zu speichern und zu verarbeiten. Ng et al. ersetzten diese Funktionen durch nicht-lineare Wavelets, damit komplexere Lichtverhältnisse dargestellt werden können. (de)
  • Precomputed Radiance Transfer (PRT) is a computer graphics technique used to render a scene in real time with complex light interactions being precomputed to save time. Radiosity methods can be used to determine the diffuse lighting of the scene, however PRT offers a method to dynamically change the lighting environment. In essence, PRT computes the illumination of a point as a linear combination of incident irradiance. An efficient method must be used to encode this data, such as spherical harmonics. When spherical harmonics are used to approximate the light transport function, only low-frequency effects can be handled with a reasonable number of parameters. Ren Ng extended this work to handle higher frequency shadows by replacing spherical harmonics with non-linear wavelets. Teemu Mäki-Patola gives a clear introduction to the topic based on the work of et al. At SIGGRAPH 2005, a detailed course on PRT was given. (en)
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  • Precomputed Radiance Transfer (PRT) ist eine Technik in der Computergrafik, die eingesetzt wird, um eine Szene mit komplexen Lichtinteraktionen in Echtzeit rendern zu können. Dabei stützt sie sich auf Beleuchtungsinformationen, die einmalig berechnet und zur Laufzeit lediglich ausgewertet werden. PRT berechnet die Helligkeit eines Punktes durch Linearkombination von einfallender Lichtstrahlung, die durch geeignete Funktionen kodiert ist. (de)
  • Precomputed Radiance Transfer (PRT) is a computer graphics technique used to render a scene in real time with complex light interactions being precomputed to save time. Radiosity methods can be used to determine the diffuse lighting of the scene, however PRT offers a method to dynamically change the lighting environment. In essence, PRT computes the illumination of a point as a linear combination of incident irradiance. An efficient method must be used to encode this data, such as spherical harmonics. (en)
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  • Precomputed Radiance Transfer (de)
  • Precomputed Radiance Transfer (en)
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