--- ray/src/cv/bsdfinterp.c	2014/03/24 17:22:33	2.18
+++ ray/src/cv/bsdfinterp.c	2014/08/21 10:33:48	2.19
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bsdfinterp.c,v 2.18 2014/03/24 17:22:33 greg Exp $";
+static const char RCSid[] = "$Id: bsdfinterp.c,v 2.19 2014/08/21 10:33:48 greg Exp $";
 #endif
 /*
  * Interpolate BSDF data from radial basis functions in advection mesh.
@@ -263,6 +263,8 @@ get_interp(MIGRATION *miga[3], FVECT invec)
 	}
 }
 
+/* 
+
 /* Advect between recorded incident angles and allocate new RBF */
 RBFNODE *
 advect_rbf(const FVECT invec, int lobe_lim)
@@ -280,7 +282,7 @@ advect_rbf(const FVECT invec, int lobe_lim)
 	VCOPY(sivec, invec);			/* find triangle/edge */
 	sym = get_interp(miga, sivec);
 	if (sym < 0)				/* can't interpolate? */
-		return(NULL);
+		return(def_rbf_spec(invec));
 	if (miga[1] == NULL) {			/* advect along edge? */
 		rbf = e_advect_rbf(miga[0], sivec, lobe_lim);
 		if (single_plane_incident)