The constant radiance term

• Autorzy: Neumann L. , Neumann A. , Prikryl J. , Purgathofer W.
• Języki publikacji: EN

Abstrakty

EN

This paper describes a fundamential improvement for all rendering methods that evaluate the rendering equation in any complexity. The "constant Radiance Term" accelerates the computation of multiple interreflections in arbitrary non-diffuse environments. It is an extension of the constant radiosity step untroduced ealiner for solving radiosity problems and does not require geometrical nor visibility information. A constant radiance portion is extracted from the solution in every surface point and every direction. The residuum problem can be solved faster or with reduced variance by all known methods that consider non-diffuse light interreflections, like different versions of distribution ray tracing, deterministic and stochastic radiosity methods, and hybrid solutions. The constant radiance value is chosen in such a way that the total self-emitted power of the residuum problem is zero so that after the extraction of the constant part there are places with positive self-emittance and places with positive self-emittance and places with negative self emittance. The achieved acceleration can be significant for environments with many bright coloured surfaces. Using a decomposition into separate positive and negative problems it is possible to apply the technique even when using turnkey rendering software.

Słowa kluczowe

EN

radiance; rendering equation; albedo; non-diffuse environments

• Wydawca: Institute of Information Technology of the Warsaw University of Life Sciences – SGGW
• Czasopismo: Machine Graphics and Vision
• Rocznik: 1998
• Tom: Vol. 7, No. 3
• Strony: 535--549
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Neumann L.

autor

Neumann A.

autor

Prikryl J.

autor

Purgathofer W.

• Maros u. 36, H-1122 Budapest, Hungary,