--- ray/src/cv/bsdfinterp.c	2012/12/12 04:49:59	2.8
+++ ray/src/cv/bsdfinterp.c	2013/09/26 17:05:00	2.12
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bsdfinterp.c,v 2.8 2012/12/12 04:49:59 greg Exp $";
+static const char RCSid[] = "$Id: bsdfinterp.c,v 2.12 2013/09/26 17:05:00 greg Exp $";
 #endif
 /*
  * Interpolate BSDF data from radial basis functions in advection mesh.
@@ -151,8 +151,9 @@ static int
 in_mesh(MIGRATION *miga[3], unsigned char *emap, int nedges,
 			const FVECT ivec, MIGRATION *mig)
 {
-	MIGRATION	*ej1, *ej2;
-	RBFNODE		*tv;
+	RBFNODE		*tv[2];
+	MIGRATION	*sej[2], *dej[2];
+	int		i;
 						/* check visitation record */
 	if (!check_edge(emap, nedges, mig, 1))
 		return(0);
@@ -160,30 +161,38 @@ in_mesh(MIGRATION *miga[3], unsigned char *emap, int n
 		miga[0] = mig;			/* close enough to edge */
 		return(1);
 	}
-						/* do triangles either side */
-	for (ej1 = mig->rbfv[0]->ejl; ej1 != NULL;
-				ej1 = nextedge(mig->rbfv[0],ej1)) {
-	    if (ej1 == mig)
-		continue;
-	    tv = opp_rbf(mig->rbfv[0],ej1);
-	    for (ej2 = tv->ejl; ej2 != NULL; ej2 = nextedge(tv,ej2))
-		if (opp_rbf(tv,ej2) == mig->rbfv[1]) {
-			int	do_ej1 = check_edge(emap, nedges, ej1, 0);
-			int	do_ej2 = check_edge(emap, nedges, ej2, 0);
-			if (do_ej1 && in_mesh(miga, emap, nedges, ivec, ej1))
-				return(1);
-			if (do_ej2 && in_mesh(miga, emap, nedges, ivec, ej2))
-				return(1);
-						/* check just once */
-			if (do_ej1 & do_ej2 && in_tri(mig->rbfv[0],
-						mig->rbfv[1], tv, ivec)) {
-				miga[0] = mig;
-				miga[1] = ej1;
-				miga[2] = ej2;
-				return(1);
+	if (!get_triangles(tv, mig))		/* do triangles either side? */
+		return(0);
+	for (i = 2; i--; ) {			/* identify edges to check */
+		MIGRATION	*ej;
+		sej[i] = dej[i] = NULL;
+		if (tv[i] == NULL)
+			continue;
+		for (ej = tv[i]->ejl; ej != NULL; ej = nextedge(tv[i],ej)) {
+			RBFNODE	*rbfop = opp_rbf(tv[i],ej);
+			if (rbfop == mig->rbfv[0]) {
+				if (check_edge(emap, nedges, ej, 0))
+					sej[i] = ej;
+			} else if (rbfop == mig->rbfv[1]) {
+				if (check_edge(emap, nedges, ej, 0))
+					dej[i] = ej;
 			}
 		}
 	}
+	for (i = 2; i--; ) {			/* check triangles just once */
+		if (sej[i] != NULL && in_mesh(miga, emap, nedges, ivec, sej[i]))
+			return(1);
+		if (dej[i] != NULL && in_mesh(miga, emap, nedges, ivec, dej[i]))
+			return(1);
+		if ((sej[i] == NULL) | (dej[i] == NULL))
+			continue;
+		if (in_tri(mig->rbfv[0], mig->rbfv[1], tv[i], ivec)) {
+			miga[0] = mig;
+			miga[1] = sej[i];
+			miga[2] = dej[i];
+			return(1);
+		}
+	}
 	return(0);				/* not near this edge */
 }
 
@@ -193,28 +202,27 @@ get_interp(MIGRATION *miga[3], FVECT invec)
 {
 	miga[0] = miga[1] = miga[2] = NULL;
 	if (single_plane_incident) {		/* isotropic BSDF? */
-		RBFNODE	*rbf;			/* find edge we're on */
-		for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) {
-			if (input_orient*rbf->invec[2] < input_orient*invec[2])
-				break;
-			if (rbf->next != NULL &&
-					input_orient*rbf->next->invec[2] <
+	    RBFNODE	*rbf;			/* find edge we're on */
+	    for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) {
+		if (input_orient*rbf->invec[2] < input_orient*invec[2])
+			break;
+		if (rbf->next != NULL && input_orient*rbf->next->invec[2] <
 							input_orient*invec[2]) {
-				for (miga[0] = rbf->ejl; miga[0] != NULL;
-						miga[0] = nextedge(rbf,miga[0]))
-					if (opp_rbf(rbf,miga[0]) == rbf->next) {
-						double	nf = 1.-rbf->invec[2]*rbf->invec[2];
-						if (nf > FTINY) {
-							nf = sqrt((1.-invec[2]*invec[2])/nf);
-							invec[0] = nf*rbf->invec[0];
-							invec[1] = nf*rbf->invec[1];
-						}
-						return(0);
-					}
-				break;
+		    for (miga[0] = rbf->ejl; miga[0] != NULL;
+					miga[0] = nextedge(rbf,miga[0]))
+			if (opp_rbf(rbf,miga[0]) == rbf->next) {
+				double	nf = 1. - rbf->invec[2]*rbf->invec[2];
+				if (nf > FTINY) {	/* rotate to match */
+					nf = sqrt((1.-invec[2]*invec[2])/nf);
+					invec[0] = nf*rbf->invec[0];
+					invec[1] = nf*rbf->invec[1];
+				}
+				return(0);
 			}
+		    break;
 		}
-		return(-1);			/* outside range! */
+	    }
+	    return(-1);				/* outside range! */
 	}
 	{					/* else use triangle mesh */
 		int		sym = use_symmetry(invec);
@@ -231,9 +239,14 @@ get_interp(MIGRATION *miga[3], FVECT invec)
 			exit(1);
 		}
 						/* identify intersection  */
-		if (!in_mesh(miga, emap, nedges, invec, mig_list))
+		if (!in_mesh(miga, emap, nedges, invec, mig_list)) {
+#ifdef DEBUG
+			fprintf(stderr,
+			"Incident angle (%.1f,%.1f) deg. outside mesh\n",
+					get_theta180(invec), get_phi360(invec));
+#endif
 			sym = -1;		/* outside mesh */
-		else if (miga[1] != NULL &&
+		} else if (miga[1] != NULL &&
 				(miga[2] == NULL || !order_triangle(miga))) {
 #ifdef DEBUG
 			fputs("Munged triangle in get_interp()\n", stderr);
@@ -253,7 +266,7 @@ e_advect_rbf(const MIGRATION *mig, const FVECT invec)
 	int		n, i, j;
 	double		t, full_dist;
 						/* get relative position */
-	t = acos(DOT(invec, mig->rbfv[0]->invec));
+	t = Acos(DOT(invec, mig->rbfv[0]->invec));
 	if (t < M_PI/grid_res) {		/* near first DSF */
 		n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1);
 		rbf = (RBFNODE *)malloc(n);
@@ -324,8 +337,9 @@ memerr:
 
 /* Partially advect between recorded incident angles and allocate new RBF */
 RBFNODE *
-advect_rbf(const FVECT invec)
+advect_rbf(const FVECT invec, int lobe_lim)
 {
+	double		cthresh = FTINY;
 	FVECT		sivec;
 	MIGRATION	*miga[3];
 	RBFNODE		*rbf;
@@ -366,13 +380,18 @@ advect_rbf(const FVECT invec)
 	geodesic(v1, miga[0]->rbfv[0]->invec, miga[0]->rbfv[1]->invec,
 			s, GEOD_REL);
 	t = acos(DOT(v1,sivec)) / acos(DOT(v1,miga[1]->rbfv[1]->invec));
+tryagain:
 	n = 0;					/* count migrating particles */
 	for (i = 0; i < mtx_nrows(miga[0]); i++)
 	    for (j = 0; j < mtx_ncols(miga[0]); j++)
-		for (k = (mtx_coef(miga[0],i,j) > FTINY) *
+		for (k = (mtx_coef(miga[0],i,j) > cthresh) *
 					mtx_ncols(miga[2]); k--; )
-			n += (mtx_coef(miga[2],i,k) > FTINY ||
-				mtx_coef(miga[1],j,k) > FTINY);
+			n += (mtx_coef(miga[2],i,k) > cthresh ||
+				mtx_coef(miga[1],j,k) > cthresh);
+	if ((lobe_lim > 0) & (n > lobe_lim)) {
+		cthresh = cthresh*2. + 10.*FTINY;
+		goto tryagain;
+	}
 #ifdef DEBUG
 	fprintf(stderr, "Input RBFs have %d, %d, %d nodes -> output has %d\n",
 			miga[0]->rbfv[0]->nrbf, miga[0]->rbfv[1]->nrbf,
@@ -400,7 +419,7 @@ advect_rbf(const FVECT invec)
 		const float	ma = mtx_coef(miga[0],i,j);
 		const RBFVAL	*rbf1j;
 		double		rad1j, srad2;
-		if (ma <= FTINY)
+		if (ma <= cthresh)
 			continue;
 		rbf1j = &miga[0]->rbfv[1]->rbfa[j];
 		rad1j = R2ANG(rbf1j->crad);
@@ -413,7 +432,7 @@ advect_rbf(const FVECT invec)
 		    const RBFVAL	*rbf2k;
 		    double		rad2k;
 		    int			pos[2];
-		    if ((mb <= FTINY) & (mc <= FTINY))
+		    if ((mb <= cthresh) & (mc <= cthresh))
 			continue;
 		    rbf2k = &miga[2]->rbfv[1]->rbfa[k];
 		    rbf->rbfa[n].peak = w0i * ma * (mb*mbfact + mc*mcfact);