--- ray/src/rt/ray.h	1992/01/04 19:53:55	2.2
+++ ray/src/rt/ray.h	1995/12/09 09:35:00	2.6
@@ -1,4 +1,4 @@
-/* Copyright (c) 1992 Regents of the University of California */
+/* Copyright (c) 1995 Regents of the University of California */
 
 /* SCCSid "$SunId$ LBL" */
 
@@ -14,6 +14,10 @@
 
 #include  "color.h"
 
+#define  MAXDIM		32	/* maximum number of dimensions */
+
+#define  MAXSLIST	32	/* maximum sources to check */
+
 				/* ray type flags */
 #define  PRIMARY	01		/* original ray */
 #define  SHADOW		02		/* ray to light source */
@@ -27,7 +31,7 @@
 #define  RAYREFL	(SHADOW|REFLECTED|AMBIENT|SPECULAR)
 
 typedef struct ray {
-	long  rno;		/* unique ray number */
+	unsigned long  rno;	/* unique ray number */
 	int  rlvl;		/* number of reflections for this ray */
 	float  rweight;		/* cumulative weight of this ray */
 	short  rtype;		/* ray type */
@@ -35,6 +39,7 @@ typedef struct ray {
 	struct ray  *parent;	/* ray this originated from */
 	FVECT  rorg;		/* origin of ray */
 	FVECT  rdir;		/* normalized direction of ray */
+	double  rmax;		/* maximum distance (aft clipping plane) */
 	int  rsrc;		/* source we're aiming for */
 	OBJECT  *clipset;	/* set of objects currently clipped */
 	OBJECT  *newcset;	/* next clipset, used for transmission */
@@ -49,16 +54,20 @@ typedef struct ray {
 	COLOR  pcol;		/* pattern color */
 	COLOR  rcol;		/* returned ray value */
 	double  rt;		/* returned effective ray length */
+	COLOR  cext;		/* medium extinction coefficient */
+	float  albedo;		/* medium scattering albedo */
+	float  gecc;		/* scattering eccentricity coefficient */
+	int  *slights;		/* list of lights to test for scattering */
 }  RAY;
 
 extern int  raytrace();
 
 extern double  raynormal();
 
+extern double  raydistance();
+
 extern int  dimlist[];		/* dimension list for distribution */
 extern int  ndims;		/* number of dimensions so far */
 extern int  samplendx;		/* index for this sample */
-
-#define  MAXDIM		32	/* maximum number of dimensions */
 
 #define  rayvalue(r)	(*(r)->revf)(r)