--- ray/src/common/bsdf.h	2011/02/18 02:41:55	2.5
+++ ray/src/common/bsdf.h	2011/02/21 22:50:37	2.8
@@ -1,4 +1,4 @@
-/* RCSid $Id: bsdf.h,v 2.5 2011/02/18 02:41:55 greg Exp $ */
+/* RCSid $Id: bsdf.h,v 2.8 2011/02/21 22:50:37 greg Exp $ */
 /*
  *  bsdf.h
  *  
@@ -9,6 +9,11 @@
  *	in the surface plane pointed to the right as seen from the front.
  *	This means the Y-axis is "up" and the Z-axis is the surface normal.
  *
+ *  Note that we reverse the identification of "front" and "back" from
+ *	the conventions used in WINDOW 6.  "Front" in our library points
+ *	in the +Z direction, towards the interior of the space rather
+ *	than the exterior.
+ *
  *  BSDF vectors always oriented away from surface, even when "incident."
  *
  *  Created by Greg Ward on 1/10/11.
@@ -40,10 +45,9 @@ extern "C" {
 #define	SDsampAll	0xF		/* include everything */
 
 /* Projected solid angle query flags fos SDsizeBSDF() */
-#define	SDqueryInc	0x1		/* query incoming vector */
-#define	SDqueryOut	0x2		/* query outgoing vector */
-#define	SDqueryMin	0x4		/* query minimum proj. solid angle */
-#define	SDqueryMax	0x8		/* query maximum proj. solid angle */
+#define SDqueryVal	0x0		/* query single value */
+#define	SDqueryMin	0x1		/* query minimum proj. solid angle */
+#define	SDqueryMax	0x2		/* query maximum proj. solid angle */
 
 /* Error codes: normal return, out of memory, file i/o, file format, bad argument,
 		 bad data, unsupported feature, internal error, unknown error */
@@ -136,7 +140,7 @@ extern int		SDretainSet;	/* set to SDretainNone by def
  * The following routines are less commonly used by applications.
  */
 
-#define	SDisLoaded(sd)	((sd)->rLambFront.spec.clock != 0)
+#define	SDisLoaded(sd)	((sd)->rLambFront.spec.flags != 0)
 
 /* Report an error to the indicated stream (in English) */
 extern SDError		SDreportEnglish(SDError ec, FILE *fp);