Real-Time Approximation of a Normal Distribution Function for Normal-Mapped Surfaces

Han-sung SON  JungHyun HAN  

IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.5   pp.1462-1465
Publication Date: 2018/05/01
Publicized: 2018/02/06
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDL8212
Type of Manuscript: LETTER
Category: Computer Graphics
real-time rendering,  normal map filtering,  normal distribution function,  

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This paper proposes to pre-compute approximate normal distribution functions and store them in textures such that real-time applications can process complex specular surfaces simply by sampling the textures. The proposed method is compatible with the GPU pipeline-based algorithms, and rendering is completed at real time. The experimental results show that the features of complex specular surfaces, such as the glinty appearance of leather and metallic flakes, are successfully reproduced.