--- ray/src/cv/bsdfrep.h	2012/11/07 03:04:23	2.5
+++ ray/src/cv/bsdfrep.h	2013/03/20 01:00:22	2.7
@@ -1,4 +1,4 @@
-/* RCSid $Id: bsdfrep.h,v 2.5 2012/11/07 03:04:23 greg Exp $ */
+/* RCSid $Id: bsdfrep.h,v 2.7 2013/03/20 01:00:22 greg Exp $ */
 /*
  * Definitions for BSDF representation used to interpolate measured data.
  *
@@ -69,6 +69,18 @@ extern int		single_plane_incident;
 extern int		input_orient;
 extern int		output_orient;
 
+				/* log BSDF histogram */
+#define	HISTLEN		256
+#define BSDF2BIG	(1./M_PI)
+#define	BSDF2SML	1e-8
+#define	HISTLNR		17.2759509		/* log(BSDF2BIG/BSDF2SML) */
+extern int		bsdf_hist[HISTLEN];
+#define histndx(v)	(int)(log((v)*(1./BSDF2SML))*(HISTLEN/HISTLNR))
+#define histval(i)	(exp(((i)+.5)*(HISTLNR/HISTLEN))*BSDF2SML)
+
+				/* BSDF value for boundary regions */
+extern double		bsdf_min;
+
 				/* processed incident DSF measurements */
 extern RBFNODE		*dsf_list;
 
@@ -113,6 +125,9 @@ extern void		rev_symmetry(FVECT vec, int sym);
 
 /* Reverse symmetry for an RBF distribution */
 extern void		rev_rbf_symmetry(RBFNODE *rbf, int sym);
+
+/* Rotate RBF to correspond to given incident vector */
+extern void		rotate_rbf(RBFNODE *rbf, const FVECT invec);
 
 /* Compute volume associated with Gaussian lobe */
 extern double		rbf_volume(const RBFVAL *rbfp);