| # | Line 25 | Line 25 | static const char RCSid[] = "$Id$"; | |
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| 25 | #define MAXITER 10 /* maximum # specular ray attempts */ | |
| 26 | #endif | |
| 27 | /* estimate of Fresnel function */ | |
| 28 | < | #define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
| 28 | > | #define FRESNE(ci) (exp(-6.2*(ci)) - 0.00202943064) |
| 29 | #define FRESTHRESH 0.017999 /* minimum specularity for approx. */ | |
| 30 | ||
| 31 | ||
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