Title :
A Local Model of Light Interaction with Transparent Crystalline Media
Author :
Debelov, V.A. ; Kozlov, Dmitry S.
Author_Institution :
Lab. of Numerical Anal. & Comput. Graphics, Inst. of Comput. Math. & Math. Geophys., Novosibirsk, Russia
Abstract :
The paper is devoted to the derivation of a bidirectional distribution function for crystals, which specifies all outgoing rays for a ray coming to the boundary of two transparent crystalline media with different optical properties, i.e., a particular mineral, directions of optical axes if they exist, and other features. A local model of interaction based on the notion of polarized light ray is introduced, which is specified by a geometric ray, its polarization state, light intensity, and so on. The computational algorithm that is suggested allows computing the directions and other properties of all (up to four) outgoing rays. In this paper, isotropic, uniaxial, and biaxial crystals are processed in a similar manner. The correctness of the model is validated by comparison of photos of real uniaxial crystals with corresponding computed images. The case of biaxial crystals is validated by testing the effect of conical refraction. Specifications of a series of tests devoted to rendering of optically different objects is presented also.
Keywords :
ray tracing; rendering (computer graphics); biaxial crystal; bidirectional distribution function; conical refraction; geometric ray; isotropic crystal; light intensity; light interaction; optical properties; polarization state; polarized light ray; rendering; transparent crystalline media; uniaxial crystal; Crystals; Equations; Media; Optical polarization; Optical refraction; Tensile stress; Vectors; Isotropic crystal; biaxial crystal; birefringence; conical refraction; crystalline aggregate; optical axis; optical dispersion; photorealistic rendering; polarized ray; ray tracing; uniaxial crystal;
Journal_Title :
Visualization and Computer Graphics, IEEE Transactions on
DOI :
10.1109/TVCG.2012.304
