--- ray/src/common/bsdf.h	2016/02/03 01:54:51	2.23
+++ ray/src/common/bsdf.h	2021/03/27 17:50:18	2.28
@@ -1,4 +1,4 @@
-/* RCSid $Id: bsdf.h,v 2.23 2016/02/03 01:54:51 greg Exp $ */
+/* RCSid $Id: bsdf.h,v 2.28 2021/03/27 17:50:18 greg Exp $ */
 /*
  *  bsdf.h
  *  
@@ -25,15 +25,12 @@
 
 #include "fvect.h"
 #include "ccolor.h"
+#include "platform.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#ifdef _WIN32
-#define	strcasecmp	stricmp
-#endif
-
 #define	SDnameLn	128		/* maximum BSDF name length */
 #define	SDmaxCh		3		/* maximum # spectral channels */
 
@@ -87,7 +84,7 @@ extern const SDCDst	SDemptyCD;	/* empty distribution *
 typedef struct SDComp_s	SDComponent;
 
 /* Methods needed to handle BSDF components (nothing is optional) */
-typedef const struct {
+typedef struct {
 					/* return non-diffuse BSDF */
 	int		(*getBSDFs)(float coef[SDmaxCh], const FVECT outVec,
 				    const FVECT inVec, SDComponent *sdc);
@@ -107,7 +104,7 @@ typedef const struct {
 /* Structure to hold a spectral BSDF component (typedef SDComponent above) */
 struct SDComp_s {
 	C_COLOR		cspec[SDmaxCh];	/* component spectral bases */
-	SDFunc		*func;		/* methods for this component */
+	const SDFunc	*func;		/* methods for this component */
 	void		*dist;		/* loaded distribution data */
 	SDCDst		*cdList;	/* cumulative distribution cache */
 };
@@ -129,7 +126,8 @@ typedef struct {
 	double		dim[3];		/* width, height, thickness (meters) */
 	SDValue		rLambFront;	/* diffuse front reflectance */
 	SDValue		rLambBack;	/* diffuse rear reflectance */
-	SDValue		tLamb;		/* diffuse transmission */
+	SDValue		tLambFront;	/* diffuse front transmittance */
+	SDValue		tLambBack;	/* diffuse back transmittance */
 	SDSpectralDF	*rf, *rb;	/* non-diffuse BRDF components */
 	SDSpectralDF	*tf, *tb;	/* non-diffuse BTDF components */
 } SDData;
@@ -148,6 +146,7 @@ extern struct SDCache_s {
 #define SDretainAll	2		/* also keep cumulative cache data */
 
 extern int		SDretainSet;	/* =SDretainNone by default */
+extern unsigned long	SDmaxCache;	/* =0 (unlimited) by default */
 
 /*****************************************************************
  * The following routines are less commonly used by applications.