著者

Xing Xiaoxiong Dobashi Yoshinori Yamamoto Tsuyoshi Katsura Yosuke Anjyo Ken

出版者

The Institute of Electronics, Information and Communication Engineers (IEICE)

雑誌

IEICE transactions on information and systems (ISSN:17451361)

巻号頁・発行日

vol.E98, no.2, pp.404-411, 2015-02

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We present an algorithm for efficient rendering of animated hair under a dynamic, low-frequency lighting environment. We use spherical harmonics (SH) to represent the environmental light. The transmittances between a point on a hair strand and the light sources are also represented by SH functions. Then, a convolution of SH functions and the scattering function of a hair strand is precomputed. This allows us to efficiently compute the intensity at a point on the hair. However, the computation of the transmittance is very time-consuming. We address this problem by using a voxel-based approach: the transmittance is computed by using a voxelized hair model. We further accelerate the computation by sampling the voxels. By using our method, we can render a hair model consisting of tens of thousands of hair strands at interactive frame rates.