open access

https://hdl.handle.net/2115/59625

Efficient Hair Rendering under Dynamic, Low-Frequency Environmental Light Using Spherical Harmonics

英語

voxelization

2015-02

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

IEICE transactions on information and systems

E98D(2)

404-411

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.

学術雑誌論文

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Copyright @2015 The Institute of Electronics, Information and Communication Engineers

1745-1361