--- ray/src/rt/normal.c	2019/04/19 19:01:32	2.80
+++ ray/src/rt/normal.c	2023/03/06 22:35:17	2.81
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: normal.c,v 2.80 2019/04/19 19:01:32 greg Exp $";
+static const char RCSid[] = "$Id: normal.c,v 2.81 2023/03/06 22:35:17 greg Exp $";
 #endif
 /*
  *  normal.c - shading function for normal materials.
@@ -25,7 +25,7 @@ static const char RCSid[] = "$Id: normal.c,v 2.80 2019
 #define  MAXITER	10		/* maximum # specular ray attempts */
 #endif
 					/* estimate of Fresnel function */
-#define  FRESNE(ci)	(exp(-5.85*(ci)) - 0.00287989916)
+#define  FRESNE(ci)	(exp(-6.2*(ci)) - 0.00202943064)
 #define  FRESTHRESH	0.017999	/* minimum specularity for approx. */