--- ray/src/rt/ambient.h	1991/06/07 10:03:51	1.1
+++ ray/src/rt/ambient.h	1992/07/13 16:17:48	2.2
@@ -35,3 +35,7 @@ extern double  maxarad;		/* maximum ambient radius */
 extern double  minarad;		/* minimum ambient radius */
 
 extern double  sumambient(), doambient(), makeambient();
+
+#define  AVGREFL	0.5	/* assumed average reflectance */
+
+#define  AMBVALSIZ	75	/* number of bytes in portable AMBVAL struct */