--- ray/src/cv/bsdf2rad.c	2013/11/26 17:33:55	2.5
+++ ray/src/cv/bsdf2rad.c	2014/02/20 09:21:32	2.7
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bsdf2rad.c,v 2.5 2013/11/26 17:33:55 greg Exp $";
+static const char RCSid[] = "$Id: bsdf2rad.c,v 2.7 2014/02/20 09:21:32 greg Exp $";
 #endif
 /*
  *  Plot 3-D BSDF output based on scattering interpolant or XML representation
@@ -91,7 +91,7 @@ main(int argc, char *argv[])
 #ifdef DEBUG
 	fprintf(stderr, "Minimum BSDF set to %.4f\n", bsdf_min);
 #endif
-	min_log = log(bsdf_min*.5);
+	min_log = log(bsdf_min*.5 + 1e-5);
 						/* output BSDF rep. */
 	for (n = 0; (n < 6) & (2*n+3 < argc); n++) {
 		double	theta = atof(argv[2*n+2]);
@@ -131,7 +131,7 @@ main(int argc, char *argv[])
 			for (i = 0; i < rbf->nrbf; i++) {
 				ovec_from_pos(odir, rbf->rbfa[i].gx, rbf->rbfa[i].gy);
 				bsdf = eval_rbfrep(rbf, odir) / (output_orient*odir[2]);
-				bsdf = log(bsdf) - min_log;
+				bsdf = log(bsdf + 1e-5) - min_log;
 				printf("pmat sphere p%d\n0\n0\n4 %f %f %f %f\n",
 					i+1, odir[0]*bsdf, odir[1]*bsdf, odir[2]*bsdf,
 						.007*bsdf);
@@ -156,7 +156,7 @@ main(int argc, char *argv[])
 			} else
 				bsdf = eval_rbfrep(rbf, odir) /
 						(output_orient*odir[2]);
-			bsdf = log(bsdf) - min_log;
+			bsdf = log(bsdf + 1e-5) - min_log;
 			fprintf(fp, "%.8e %.8e %.8e\n",
 					odir[0]*bsdf, odir[1]*bsdf, odir[2]*bsdf);
 		    }