--- ray/doc/notes/ReleaseNotes	2005/02/07 17:08:16	1.65
+++ ray/doc/notes/ReleaseNotes	2005/05/04 23:43:19	1.73
@@ -1402,3 +1402,44 @@ Added setting of focus distance in rvu ("focus" comman
 
 Changed default remote shell in ranimate to "ssh" rather than "rsh",
 which has been abandoned on most Unix systems due to security issues.
+
+Fixed behavior of source primitive using illum with no alternate
+material.  These now become transparent so one can see the sky or
+light-probe background for use in image-based lighting.  Previously,
+the user needed to specify the background glow as the alternate
+material for a distant illum source to behave properly.  (This still
+works.)
+
+Fixed some minor problems and inconsistencies with 16-bit/channel
+TIFF i/o in ra_tiff.
+
+Created mksource program to generate distant sources for improved
+image-based lighting with light probes.
+
+Changed ambient calculation so that -ad will not limit recursion
+depth, and a minimum of 27 samples will be sent out for each stored
+ambient value, or 3 samples if -aa is 0 (caching off).
+
+Added -oM option to rtrace to report material (rather than modifier)
+for cases where actual material is aliased or further up modifier chain.
+
+Rearranged the way ray contributions are computed so that it might be
+possible to use rtrace to derive daylight coefficients and optical
+transfer functions.  The new -oTW option of rtrace produces color
+contribution weights for each ray, which combined with the -ti (or -tI)
+option permits the contribution of selected surfaces or sources to
+be determined.  Using the -oTW option, one should also specify
+options "-dt 0 -aa 0 -as 0" for optimal results.  In particular,
+one cannot expect reasonable tallies with -ab >= 1 and irradiance
+caching on (-aa > 0).
+
+The same code modifications included a change to the indirect computation
+with caching switched off (-aa 0).  Whereas before, the number of secondary
+rays after the first bounce were half of the previous generation, they are
+now determined by the surface reflectance, making for a better and faster
+calculation.  It should now be possible to compute many bounces with -aa 0,
+which used to be prohibitively expensive.
+
+Added -T option to xshowtrace to trace rays to light sources.
+
+Added meta2bmp program to produce BMP files from metafile graphics.