--- ray/src/util/rfluxmtx.c	2014/08/26 19:10:10	2.18
+++ ray/src/util/rfluxmtx.c	2014/12/04 05:26:28	2.19
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rfluxmtx.c,v 2.18 2014/08/26 19:10:10 greg Exp $";
+static const char RCSid[] = "$Id: rfluxmtx.c,v 2.19 2014/12/04 05:26:28 greg Exp $";
 #endif
 /*
  * Calculate flux transfer matrix or matrices using rcontrib
@@ -516,21 +516,12 @@ make_axes(FVECT uva[2], const FVECT nrm)
 {
 	int	i;
 
-	uva[1][0] = 0.5 - frandom();
-	uva[1][1] = 0.5 - frandom();
-	uva[1][2] = 0.5 - frandom();
-	for (i = 3; i--; )
-		if ((-0.6 < nrm[i]) & (nrm[i] < 0.6))
-			break;
-	if (i < 0) {
+	if (!getperpendicular(uva[0], nrm)) {
 		fputs(progname, stderr);
 		fputs(": bad surface normal in make_axes!\n", stderr);
 		exit(1);
 	}
-	uva[1][i] = 1.0;
-	VCROSS(uva[0], uva[1], nrm);
-	normalize(uva[0]);
-	VCROSS(uva[1], nrm, uva[0]);
+	fcross(uva[1], nrm, uva[0]);
 }
 
 /* Illegal sender surfaces end up here */