--- ray/src/rt/rcmain.c	2012/06/22 22:03:02	2.7
+++ ray/src/rt/rcmain.c	2013/08/11 13:48:48	2.11
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rcmain.c,v 2.7 2012/06/22 22:03:02 greg Exp $";
+static const char	RCSid[] = "$Id: rcmain.c,v 2.11 2013/08/11 13:48:48 greg Exp $";
 #endif
 /*
  *  rcmain.c - main for rtcontrib ray contribution tracer
@@ -8,6 +8,7 @@ static const char	RCSid[] = "$Id: rcmain.c,v 2.7 2012/
 #include "copyright.h"
 
 #include <signal.h>
+#include <time.h>
 #include "rcontrib.h"
 #include "random.h"
 #include "source.h"
@@ -45,14 +46,12 @@ int		nmods = 0;		/* number of modifiers */
 
 void	(*addobjnotify[8])() = {ambnotify, NULL};
 
-char	RCCONTEXT[] = "RCONTRIB";	/* our special evaluation context */
+char	RCCONTEXT[] = "RC";		/* our special evaluation context */
 
 
 static void
 printdefaults(void)			/* print default values to stdout */
 {
-	char  *cp;
-
 	printf("-c %-5d\t\t\t# accumulated rays per record\n", accumulate);
 	printf("-V%c\t\t\t\t# output %s\n", contrib ? '+' : '-',
 			contrib ? "contributions" : "coefficients");
@@ -290,6 +289,8 @@ main(int argc, char *argv[])
 			goto badopt;
 		}
 	}
+	if (nmods <= 0)
+		error(USER, "missing required modifier argument");
 					/* override some option settings */
 	override_options();
 					/* initialize object types */
@@ -335,8 +336,6 @@ main(int argc, char *argv[])
 	nsceneobjs = nobjects;
 
 	marksources();			/* find and mark sources */
-	for (i = 0; i < nsources; i++)	/* tracing to sources as well */
-		source[i].sflags |= SFOLLOW;
 
 	setambient();			/* initialize ambient calculation */