--- ray/src/rt/rcmain.c	2016/03/10 18:25:46	2.15
+++ ray/src/rt/rcmain.c	2018/01/18 19:43:43	2.18
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rcmain.c,v 2.15 2016/03/10 18:25:46 schorsch Exp $";
+static const char	RCSid[] = "$Id: rcmain.c,v 2.18 2018/01/18 19:43:43 greg Exp $";
 #endif
 /*
  *  rcmain.c - main for rtcontrib ray contribution tracer
@@ -48,7 +48,7 @@ int		nmods = 0;		/* number of modifiers */
 
 void	(*addobjnotify[8])() = {ambnotify, NULL};
 
-char	RCCONTEXT[] = "RC";		/* our special evaluation context */
+char	RCCONTEXT[] = "RC.";		/* our special evaluation context */
 
 
 static void
@@ -180,6 +180,9 @@ main(int argc, char *argv[])
 	progname = argv[0] = fixargv0(argv[0]);
 	gargv = argv;
 	gargc = argc;
+#if defined(_WIN32) || defined(_WIN64)
+	_setmaxstdio(2048);		/* increase file limit to maximum */
+#endif
 					/* initialize calcomp routines early */
 	initfunc();
 	setcontext(RCCONTEXT);
@@ -363,7 +366,7 @@ main(int argc, char *argv[])
 
 badopt:
 	fprintf(stderr,
-"Usage: %s [-n nprocs][-V][-r][-e expr][-f source][-o ospec][-p p1=V1,p2=V2][-b binv][-bn N] {-m mod | -M file} [rtrace options] octree\n",
+"Usage: %s [-n nprocs][-V][-c count][-r][-e expr][-f source][-o ospec][-p p1=V1,p2=V2][-b binv][-bn N] {-m mod | -M file} [rtrace options] octree\n",
 			progname);
 	sprintf(errmsg, "command line error at '%s'", argv[i]);
 	error(USER, errmsg);