--- ray/src/cv/bsdf2klems.c	2013/06/29 21:03:25	2.6
+++ ray/src/cv/bsdf2klems.c	2013/08/01 16:10:13	2.7
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bsdf2klems.c,v 2.6 2013/06/29 21:03:25 greg Exp $";
+static const char RCSid[] = "$Id: bsdf2klems.c,v 2.7 2013/08/01 16:10:13 greg Exp $";
 #endif
 /*
  * Load measured BSDF interpolant and write out as XML file with Klems matrix.
@@ -154,6 +154,7 @@ static void
 eval_bsdf(const char *fname)
 {
 	ANGLE_BASIS	*abp = get_basis(kbasis);
+	float		*trans_mtx = NULL;
 	SDData		bsd;
 	SDError		ec;
 	FVECT		vin, vout;
@@ -209,6 +210,9 @@ eval_bsdf(const char *fname)
 	}
 						/* front transmission */
 	if (bsd.tf != NULL || bsd.tLamb.cieY > .002) {
+	    if (bsd.tb == NULL)
+		trans_mtx = (float *)malloc(sizeof(float) *
+						abp->nangles*abp->nangles);
 	    input_orient = 1; output_orient = -1;
 	    data_prologue();
 	    for (j = 0; j < abp->nangles; j++) {
@@ -223,33 +227,56 @@ eval_bsdf(const char *fname)
 			sum += sv.cieY;
 		    }
 		    printf("\t%.3e\n", sum/npsamps);
+		    if (trans_mtx != NULL)
+			trans_mtx[j*abp->nangles + i] = sum/npsamps;
 		}
 		putchar('\n');			/* extra space between rows */
 	    }
 	    data_epilogue();
 	}
 						/* back transmission */
-	if (bsd.tb != NULL) {
+	if (bsd.tb != NULL || trans_mtx != NULL) {
+	    if (bsd.tf == NULL)
+		trans_mtx = (float *)malloc(sizeof(float) *
+						abp->nangles*abp->nangles);
 	    input_orient = -1; output_orient = 1;
 	    data_prologue();
 	    for (j = 0; j < abp->nangles; j++) {
-	        for (i = 0; i < abp->nangles; i++) {
-		    sum = 0;			/* average over patches */
-		    for (n = npsamps; n-- > 0; ) {
-			fo_getvec(vout, j+(n+frandom())/npsamps, abp);
-			bi_getvec(vin, i+urand(n), abp);
-			ec = SDevalBSDF(&sv, vout, vin, &bsd);
-			if (ec != SDEnone)
+	        for (i = 0; i < abp->nangles; i++)
+		    if (bsd.tb != NULL) {	/* use tb if we have it */
+			sum = 0;		/* average over patches */
+			for (n = npsamps; n-- > 0; ) {
+			    fo_getvec(vout, j+(n+frandom())/npsamps, abp);
+			    bi_getvec(vin, i+urand(n), abp);
+			    ec = SDevalBSDF(&sv, vout, vin, &bsd);
+			    if (ec != SDEnone)
 				goto err;
-			sum += sv.cieY;
+			    sum += sv.cieY;
+			}
+			printf("\t%.3e\n", sum/npsamps);
+			if (trans_mtx != NULL)
+			    trans_mtx[i*abp->nangles + j] = sum/npsamps;
+		    } else {			/* else transpose tf */
+			printf("\t%.3e\n", trans_mtx[i*abp->nangles + j]);
 		    }
-		    printf("\t%.3e\n", sum/npsamps);
-		}
 		putchar('\n');			/* extra space between rows */
 	    }
 	    data_epilogue();
 	}
+						/* derived front transmission */
+	if (bsd.tf == NULL && trans_mtx != NULL) {
+	    input_orient = 1; output_orient = -1;
+	    data_prologue();
+	    for (j = 0; j < abp->nangles; j++) {
+	        for (i = 0; i < abp->nangles; i++)
+		    printf("\t%.3e\n", trans_mtx[j*abp->nangles + i]);
+		putchar('\n');			/* extra space between rows */
+	    }
+	    data_epilogue();
+	}
 	SDfreeBSDF(&bsd);			/* all done */
+	if (trans_mtx != NULL)
+		free(trans_mtx);
 	return;
 err:
 	SDreportError(ec, stderr);