Author_Institution :
California Univ., Davis, CA, USA
Abstract :
This tutorial survey paper reviews several different models for light interaction with volume densities of absorbing, glowing, reflecting, and/or scattering material. They are, in order of increasing realism, absorption only, emission only, emission and absorption combined, single scattering of external illumination without shadows, single scattering with shadows, and multiple scattering. For each model the paper provides the physical assumptions, describes the applications for which it is appropriate, derives the differential or integral equations for light transport, presents calculation methods for solving them, and shows output images for a data set representing a cloud. Special attention is given to calculation methods for the multiple scattering model
Keywords :
clouds; differential equations; integral equations; light absorption; light reflection; light scattering; rendering (computer graphics); reviews; absorbing; calculation methods; cloud; differential equations; direct volume rendering; glowing; illumination; integral equations; light interaction; multiple scattering model; optical models; reflecting; scattering; shadows; volume densities; Absorption; Computational modeling; Grid computing; Interpolation; Light scattering; Optical computing; Optical scattering; Rendering (computer graphics); Stimulated emission; X-ray scattering;
