--- ray/doc/ray.html 2025/05/29 16:42:28 1.41
+++ ray/doc/ray.html 2025/05/30 16:35:52 1.42
@@ -1,5 +1,5 @@
-
+
The RADIANCE 6.0 Synthetic Imaging System
@@ -586,25 +586,27 @@ This is only appropriate if the surface hides other (m
3 red green blue
</pre>
-While alternate materials that are reflective will appear as normal,
-indirect rays will use the mirror's reflectance rather than the
-alternate type.
-Transmitting materials are an exception, where both transmission and
-reflection will use the alternate type for all rays not specifically
-targeting virtual light sources.
-Therefore, transmitting alternate types should only have pure specular
-reflection if they reflect at all, to maintain a valid calculation.
+ While alternate materials that are reflective will appear as normal,
+ indirect rays will use the mirror's reflectance rather than the
+ alternate type.
+ Transmitting materials are an exception, where both transmission and
+ reflection will use the alternate type for all rays not specifically
+ targeting virtual light sources.
+ In this case, it is important that any reflections be purely specular
+ (mirror-like) and equal to the mirror's reflectivity
+ to maintain a valid result.
+ A pure diffuse reflection may be added if desired.
<p>
-The mirror material type reflects light sources only from the front side
-of a surface, regardless of any alternate material.
-If virtual source generation is desired on both sides, two coincident
-surfaces with opposite normal orientations may be employed to achieve
-this effect.
-The reflectance and alternate material type may be
-different for the overlapped surfaces,
-and the two sides will behave accordingly.
+ The mirror material type reflects light sources only from the front side
+ of a surface, regardless of any alternate material.
+ If virtual source generation is desired on both sides, two coincident
+ surfaces with opposite normal orientations may be employed to achieve
+ this effect.
+ The reflectance and alternate material type may be
+ different for the overlapped surfaces,
+ and the two sides will behave accordingly.
<p>