--- ray/doc/notes/ReleaseNotes	2020/09/09 21:28:19	1.377
+++ ray/doc/notes/ReleaseNotes	2021/12/07 23:49:50	1.399
@@ -2390,3 +2390,111 @@ seems unnecessary.  Made tool more robust.
 
 Added -t option to rcontrib (and rfluxmtx) to report progress after the
 given number of seconds.
+
+Added "test" target to makeall to run unit tests.
+
+Modified bsdf2ttree to allow different parameters per input SIR file.
+
+Fixed issues with very large matrix files (> 2GB) in dctimestep, rmtxop,
+and rcollate.
+
+Added -rf and -rb options to rmtxop to load front or back reflectance
+matrix data from XML file rather than transmission.  (Lars Grobe suggested.)
+
+Improved behavior for coincident surfaces with different materials.
+Rather than returning one surface or the other based on floating-point
+vagaries, opaque materials are now preferred over transparent ones.
+If the materials are both transparent or both opaque, then whichever
+surface appeared later in the scene description will be selected.
+This came of a request for consistent behavior with legal CAD output
+from Peter Apian-Bennewitz.
+
+Added explicit tests for on-edge intersections with polygons.  This should
+eliminate stray rays and tiny light leaks that often appear even in
+well-constructed geometry.
+
+Added "-s up" option to pabopto2bsdf to allow for 180 degree symmetry,
+meaning that data repeats after 180 degree rotation (as distinguished
+from "-s bilateral" whose data is mirrored about a vertical plane).
+Thanks to Helen Rose Wilson for the suggestion and informing me that
+such a thing exists.
+
+Removed upper limit on number of modifiers in rcontrib.
+
+Put cap on maximum ambient gradient to avoid over-extrapolation of
+poorly computed irradiance cache values.
+
+Added robjutil +T option to triangulate all faces in .OBJ description.
+
+Altered BSDF library to have both front and back diffuse transmittance
+values, which can be different.  This was necessary to avoid issues
+caused by measurement and modeling discrepancies.
+
+Added pabopto2bsdf -g option to cull near-grazing scattering to avoid
+issues with noise and negative values.
+
+Increased default dynamic range from 32 to 100 in pcond and normtiff.
+
+Added -o and -n options to genbox to create .OBJ output and segment
+edges and corners for transparent materials.  Also added -s option
+to control smoothing for .OBJ and Radiance with segmented rounding.
+
+Made it so robjutil with the +r option for Radiance output now
+produces normal smoothing unless normals are removed with -n.
+
+Added exposure preservation to pcompos when possible (i.e., when
+there is only one input or inputs agree on exposure).
+
+Added -DSHARP_RGB compile-time option to use sharp RGB color space
+rather than historic default.  This can make for more accurate color
+calculations, but requires that materials be recalibrated.  The
+PRIMARIES= line is also produced on output from rpict or rvu with
+the correct set of primaries based on how the system was compiled.
+
+Added automatic flushing to the output of total, except when the -r
+(running subtotals) option is used.
+
+Improved behavior of little-used -aw option, so that it avoids sea-level
+rise caused by adding its own estimate back into the ambient level remainder.
+It ended up being simple enough to derate the final average by the factor
+corresponding to average surface absorpition, thus removing the average
+from the final bounce estimate.
+
+Introduced ies2rad upgrades by Randolph Fritz.  Randolph says it
+fixes the following problems:
+
+	1. Generates correct Radiance geometry for spheres in 1995, 2002,
+	and 2019 IES files.
+
+	2. Generates correct Radiance geometry for vertical cylinders that
+	are taller than they are wide.
+
+	3. Ignores the file source ("File Generation Type") field in the
+	2019 version of the file, which would otherwise be incorrectly used
+	as an output multiplier.
+
+    It also offers the following enhancements:
+
+	1. Shape information is included in the .rad file comments.
+
+	2. 1995, 2002, and 2019-version luminous opening geometry is
+	accounted for.
+
+	3. The 2002 and 2019 IES file versions are recognized and
+	processed appropriately.
+
+	4. I have made an attempt to do something intelligent with less
+	common "luminous opening" shapes in the 1995, 2002, and 2019 versions
+	of the standard, though I have not implemented any support for new
+	geometry; approximations are substituted and warning messages issued.
+	Unfortunately, this code is not tested, since I don't have any IES
+	files that use these shapes.
+
+Added support for depth-of-field blurring in vwrays using -pd option.
+Also, made -c count work with vwrays -i, producing multiple samples
+per indicated pixel position.  At the same time, support for the -pd
+option was added to rtpict, which calls on vwrays for its samples.
+
+Fixed issue with BSDFs that didn't obey reciprocity, where direct
+sampling wasn't following exactly with indirect sampling.  This was
+discovered and reported by Jon Sargent.