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@InProceedings{ML03, author = "Jennis Meyer-Spradow and J{\"o}rn Loviscach", title = "Evolutionary Design of {BRDF}s", booktitle = "Eurographics 2003 Short Paper Proceedings", pages = "301--306", year = "2003", editor = "M. Chover and H. Hagen and D. Tost", keywords = "genetic algorithms, genetic programming, GPU", URL = "http://viscg.uni-muenster.de/publications/2003/ML03/evolutionary_web.pdf", size = "6 pages", abstract = "The look of a non-transparent material is determined by its bidirectional reflection distribution function (BRDF). To design 3-D objects for example for games or animation films thus includes to design BRDFs. However, as functions defined on a four-dimensional domain, these form a vast space that is very difficult to explore interactively. Typically, the infinite number of degrees of freedom is reduced to a tractable handful of parameters by introducing simplified physical models or heuristic approximations such as Phong's As the complexity of such approaches increases, they become difficult to master for a human operator. Even if many parameters are made accessible, an infinite variety of useful and/or interesting BRDFs remains hidden and inaccessible. We therefore propose a method of constructing BRDFs through genetic programming with a human operator making choices based on his or her preferences. With the pixel shader programmability of modern graphics cards this can be performed in real time.", notes = "http://viscg.uni-muenster.de/publications/2003/ML03/ OpenGL nVidia GeForce FX 5800 fragment pixel shader assembler programs Instruction set: ADD add two vectors COS cosine of a scalar DP3 dot product using three components DP4 dot product using four components DST auxiliary operation for light attenuation EX2 the number 2 raised to a power given by a scalar LRP linear interpolation of two vectors MAD multiply and add vectors MOV copy vector to another register MUL multiply two vectors component-wise SIN sine of a scalar SUB subtract one vector from another X2D affine 2-D transform using two vectors. 25 frames per second. Up to 100 instructions", }

Genetic Programming entries for Jennis Meyer-Spradow Jorn Loviscach