--- ray/doc/notes/ReleaseNotes	2020/03/25 01:51:09	1.365
+++ ray/doc/notes/ReleaseNotes	2021/03/27 17:50:18	1.389
@@ -2237,7 +2237,7 @@ Updates to evalglare and gendaylit from Jan Wienold, i
 colored sky option.
 
 =========================
-Version 5.3
+Version 5.3 (Released September 1, 2020)
 
 Created radcompare program to compare Radiance tool output to reference outputs
 during unit-testing.
@@ -2314,8 +2314,7 @@ column vector.  Also added ability to apply trailing u
 Added new depth, normal, and ID file types to radcompare.
 
 Added BigEndian= header line for automatic byte-swapping in rmtxop
-and radcompare.  Doesn't work quite as automatically as it should
-for pvalue -r, currently.
+and radcompare.
 
 Added new "turbo" palette to falsecolor (thanks to Taoning).
 
@@ -2329,7 +2328,7 @@ Added support for loading RGBE images into matrices in
 Added -y option to gensky and gendaylit to support more accurate Michalsky
 solar position calculation.
 
-Changed rsplit so specifying a space as the separator parses words
+Changed rsplit, so specifying a space as the separator parses words
 between whitespace.
 
 Added ability of vwrays, pinterp, and pmblur2 to read encoded depth files.
@@ -2340,7 +2339,9 @@ Made it so number of segments in genworm, genrev, and 
 given as expressions of previously defined variables, etc.
 
 Added -D and -n option to gendaymtx to output sun description and skip
-matrix output on request.
+matrix output on request.  A -M option was also added to output solar
+modifiers for rcontrib.  Support also added for leap days in WEA input.
+Enhancements sponsored by Ladybug Tools.
 
 Updated eplus_uvf to work with IDF version 9.x, checking version number.
 
@@ -2348,3 +2349,83 @@ Fix to glarendx issues with dgi calculation.
 
 Made it so rmtxop and dctimestep undo any exposure applied to Radiance
 pictures they may load.
+
+Added robjutil utility to manipulate Wavefront .OBJ files.
+
+Fixed a crash related to rtrace -om or -oM with mesh instances containing
+materials.
+
+Improved rtrace flushing function to handle any value for -x without
+deadlock on controlling process.
+
+Eliminated unnecessary start-up procedures for rtrace when only ray-casting
+is needed (i.e., no tracing or value output).
+
+Improved isotropic sampling method in bsdf2ttree using "zipper" approach
+applied in genBSDF.
+
+Added limit to memory used by high-resolution tensor tree BSDFs for
+cumulative cache during MC sampling (rendering).  Limit set to 250MBytes
+per BSDF for standard architectures.
+
+Added -n and -s options to bsdf2ttree to provide some user control
+over super-sampling.
+
+Improved surface normal codec used by ambient file to store orthonormal
+directions exactly.
+
+Improved peak extraction method, which was undervaluing transmission
+in many cases.
+
+New version of evalglare from Jan Wienold.
+
+Added -u option to gendaymtx to elide data columns (time steps) when
+the sun is not visible above the horizon.
+
+=========================
+Version 5.4
+
+Added rcollate -c option to force operation to continue even if it
+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.