--- ray/doc/ray.html 2018/06/25 20:49:10 1.25 +++ ray/doc/ray.html 2023/11/03 17:41:27 1.32 @@ -1,8 +1,8 @@ - + -The RADIANCE 5.2 Synthetic Imaging System +The RADIANCE 5.4 Synthetic Imaging System @@ -10,7 +10,7 @@ The RADIANCE 5.2 Synthetic Imaging System

-The RADIANCE 5.2 Synthetic Imaging System +The RADIANCE 5.4 Synthetic Imaging System

@@ -83,7 +83,7 @@ The diagram in Figure 1 shows the flow between program (ovals). The central program is rpict, which produces a picture from a scene description. -Rview is a variation of rpict that computes and displays images +Rvu is a variation of rpict that computes and displays images interactively, and rtrace computes single ray values. Other programs (not shown) connect many of these elements together, such as the executive programs @@ -822,6 +822,8 @@ unless the line integrals consider enclosed geometry. Also, rather than roughness, specular power is used, which has no physical meaning other than larger numbers are equivalent to a smoother surface. + Unlike other material types, total reflectance is the sum of + diffuse and specular colors, and should be adjusted accordingly. 

 	mod ashik2 id
 	4+ ux uy uz funcfile transform
@@ -1154,22 +1156,23 @@ unless the line integrals consider enclosed geometry.
 

 
 

-	
-	sBSDF
+	
+	aBSDF
 	
 
 

-	The sBSDF material is identical to the BSDF type with two
+	The aBSDF material is identical to the BSDF type with two
 	important differences.  First, proxy geometry is not
 	supported, so there is no thickness parameter.  Second, an
-	sBSDF is assumed to have some specular through component,
+	aBSDF is assumed to have some specular through component
+	(the ’a’ stands for "aperture"),
 	which is treated specially during the direct calculation
 	and when viewing the material.  Based on the BSDF data, the
 	coefficient of specular transmission is determined and used
 	for modifying unscattered shadow and view rays.
 
 
-	mod sBSDF id
+	mod aBSDF id
 	5+ BSDFfile ux uy uz funcfile transform
 	0
 	0|3|6|9
@@ -1181,7 +1184,7 @@ unless the line integrals consider enclosed geometry.
 

 	If a material has no specular transmitted component, it is
 	much better to use the BSDF type with a zero thickness
-	than to use sBSDF.
+	than to use aBSDF.
 

 
 

@@ -1806,7 +1809,7 @@ The details of this process  are  not  important, but 
 directs the use of a scene description.