--- ray/doc/ray.html 2015/12/01 16:58:16 1.22 +++ ray/doc/ray.html 2018/06/26 14:42:18 1.26 @@ -1,8 +1,8 @@ - + -The RADIANCE 5.1 Synthetic Imaging System +The RADIANCE 5.2 Synthetic Imaging System @@ -10,7 +10,7 @@ The RADIANCE 5.1 Synthetic Imaging System

-The RADIANCE 5.1 Synthetic Imaging System +The RADIANCE 5.2 Synthetic Imaging System

@@ -798,7 +798,8 @@ unless the line integrals consider enclosed geometry.

Trans2 is the anisotropic version of trans. - The string arguments are the same as for plastic2, and the real arguments are the same as for trans but with an additional roughness value. + The string arguments are the same as for plastic2, + and the real arguments are the same as for trans but with an additional roughness value.

         mod trans2 id
@@ -810,6 +811,27 @@ unless the line integrals consider enclosed geometry.
 
 
 

+	
+	Ashik2
+	
+
+

+	Ashik2 is the anisotropic reflectance model by Ashikhmin & Shirley.
+	The string arguments are the same as for plastic2, but the real
+	arguments have additional flexibility to specify the specular color.
+	Also, rather than roughness, specular power is used, which has no
+	physical meaning other than larger numbers are equivalent to a smoother
+	surface.
++	mod ashik2 id
+	4+ ux uy uz funcfile transform
+	0
+	8 dred dgrn dblu sred sgrn sblu u-power v-power
+
+
+
+
+

 	
 	Dielectric
 	
@@ -1129,6 +1151,38 @@ unless the line integrals consider enclosed geometry.
 	the surface will be invisible from behind.  Unlike other
 	data-driven material types, the BSDF type is fully supported
 	and all parts of the distribution are properly sampled.
+
+
+

+	
+	aBSDF
+	
+
+

+	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
+	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 aBSDF id
+	5+ BSDFfile ux uy uz funcfile transform
+	0
+	0|3|6|9
+	     rfdif gfdif bfdif
+	     rbdif gbdif bbdif
+	     rtdif gtdif btdif
+
+
+
+	If a material has no specular transmitted component, it is
+	much better to use the BSDF type with a zero thickness
+	than to use aBSDF.