# | Line 20 | Line 20 | extern double specthresh; /* specular sampling thres | |
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20 | extern double specjitter; /* specular sampling jitter */ | |
21 | ||
22 | /* | |
23 | < | * This anisotropic reflection model uses a variant on the |
24 | < | * exponential Gaussian used in normal.c. |
23 | > | * This routine implements the anisotropic Gaussian |
24 | > | * model described by Ward in Siggraph `92 article. |
25 | * We orient the surface towards the incoming ray, so a single | |
26 | * surface can be used to represent an infinitely thin object. | |
27 | * |
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