--- ray/src/rt/ambient.h	1991/11/12 17:10:27	2.1
+++ ray/src/rt/ambient.h	1996/02/14 15:18:19	2.6
@@ -12,6 +12,7 @@
  * and don't pass these vectors to fvect routines.
  */
 typedef struct ambrec {
+	unsigned long  latick;	/* last accessed tick */
 	float  pos[3];		/* position in space */
 	float  dir[3];		/* normal direction */
 	int  lvl;		/* recursion level of parent ray */
@@ -24,6 +25,7 @@ typedef struct ambrec {
 }  AMBVAL;			/* ambient value */
 
 extern COLOR  ambval;		/* global ambient component */
+extern int  ambvwt;		/* initial weight for ambient value */
 extern double  ambacc;		/* ambient accuracy */
 extern int  ambres;		/* ambient resolution */
 extern int  ambdiv;		/* number of divisions for calculation */
@@ -37,3 +39,7 @@ 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 */