--- ray/src/util/rfluxmtx.c	2014/12/04 05:26:28	2.19
+++ ray/src/util/rfluxmtx.c	2015/02/02 16:04:11	2.20
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rfluxmtx.c,v 2.19 2014/12/04 05:26:28 greg Exp $";
+static const char RCSid[] = "$Id: rfluxmtx.c,v 2.20 2015/02/02 16:04:11 greg Exp $";
 #endif
 /*
  * Calculate flux transfer matrix or matrices using rcontrib
@@ -417,7 +417,10 @@ finish_receiver(void)
 	}
 					/* determine sample type/bin */
 	if (tolower(curparams.hemis[0]) == 'u' | curparams.hemis[0] == '1') {
-		binv = "0";		/* uniform sampling -- one bin */
+		sprintf(sbuf, "if(-Dx*%g-Dy*%g-Dz*%g,0,-1)",
+			curparams.nrm[0], curparams.nrm[1], curparams.nrm[2]);
+		binv = savqstr(sbuf);
+		nbins = "1";		/* uniform sampling -- one bin */
 		uniform = 1;
 	} else if (tolower(curparams.hemis[0]) == 's' &&
 				tolower(curparams.hemis[1]) == 'c') {