--- ray/src/rt/ambient.h	1991/08/20 10:02:43	1.2
+++ ray/src/rt/ambient.h	1992/08/10 08:46:38	2.4
@@ -37,3 +37,7 @@ 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 */
+#define  AMBMAGIC	557	/* magic number for ambient value files */
+#define  AMBFMT		"Radiance_ambval"	/* format id string */