--- ray/doc/notes/ReleaseNotes	2005/05/26 06:55:22	1.76
+++ ray/doc/notes/ReleaseNotes	2014/09/15 16:49:08	1.247
@@ -1140,7 +1140,7 @@ of recursive routines using sets to avoid overrunning
 the stack limit.
 
 ==============================
-Version 3.6
+Version 3.6 (Released 10/21/04)
 
 Modified 4-byte RGBE encoding routine to avoid problems
 when one or two primary values is negative and the other(s)
@@ -1343,7 +1343,7 @@ Fixed bug in rcalc where it sometimes wasn't parsing t
 correctly.
 
 =====================
-Version 3.7
+Version 3.7 (Released 7/25/05)
 
 Fixed bug in source occluder cache which caused consistency error
 for distant sources and mist materials.  (Thanks to Mark Stock for
@@ -1382,7 +1382,7 @@ care to support officially due to its machine-dependen
 Fixed bug that caused incorrect reporting of non-surface in set when
 mixing meshes and instances.  (Thanks to Jack de Valpine for discovery.)
 
-Fixed innacuracy in calculation of diffuse transmission in the presence
+Fixed inaccuracy in calculation of diffuse transmission in the presence
 of pure specular (Fresnel reflection) using "trans" material.  Thanks
 to Christoph Reinhart for pointing out the error.
 
@@ -1456,3 +1456,522 @@ coefficient calculations for annual simulations, among
 Added tilde ('~') output option as part of the -o* specification of
 rtrace.  This permits ray trees to be parsed more easily in binary
 output mode, as needed by rtcontrib.
+
+Implemented Russian roulette ray termination with -lr <= 0.
+Made -lr -10 the default in rtcontrib.
+
+Made rtcontrib -f option search RAYPATH directories.
+
+Made it so -o option of rtcontrib can pipe -o output to a command.
+
+Added -if and -of options to total for binary i/o (following rcalc mold).
+
+Switched default options in rtrace to use Russian roulette.  (Rpict and rvu
+still use biased ray termination.)
+
+Added rtcontrib -r option to recover partial output.
+
+Added -u rendering option for pure Monte Carlo sampling.
+(Got rid of -DMC compile option, which this makes superfluous.)
+
+Changed -t option of rlam to accept strings as well as single characters.
+
+Fixed bug in rcalc with -l option where it would sometimes go into an
+infinite loop.
+
+Fixed truly ancient bug in bounding box computation for cones, which
+could (and did) cause missing segments.
+
+Added -z option to normtiff to output LZW-compressed files.
+
+Last change to total causes it to produce results when it sees an empty
+line on the input.  This was not intentional, but I decided I like this
+behavior so I documented it rather than changing it.
+
+=====================
+Version 3.8 (Released 10/17/06)
+
+Fixed Russian roulette ray termination, which was doing the opposite of
+what it should have been doing, resulting in overestimated values below
+minimum ray sampling weight (serious).
+
+Changed mksource to use 98th percentile (rather than 99th) for threshold.
+
+(Above changes included in 3.7.1 patch release.)
+
+Eliminated writing of EXPOSURE= line in ra_tiff -r when source TIFF
+does not have STONITS set.
+
+Fixed bug in ambient calculation that caused black values for multiple
+bounces in some scenes.  Thanks to Mark Stock for creating and sharing
+the sophisticated test scene that demonstrated this problem.
+
+Fixed bug in antimatter using Russian Roulette sampling.
+
+(Above changes included in 3.7.2 patch release 22 Aug 2005.)
+
+Created fieldcomb script to combine alternate fields in a rendering
+sequence.  (Development generously sponsored by Iebele Abel.)
+
+Added missing preload of mesh objects for more efficient memory use
+during parallel rendering -- this was a serious oversight.
+
+Created ran2tiff program to automate exposure setting of animation
+sequences using a moving histogram in combination with pcond, and
+converting frames to TIFF.
+
+Eliminated SPEED macro from makeall and source tree.
+
+Added -pj option to vwrays to allow jittering of sample locations.
+
+Fixed bug in rtcontrib where it occasionally missed writing the
+final bin file.  (Pretty serious, actually.)
+
+Added -Dfseeko=fseek to MACH= line for linux, as fseeko(3) seems to be
+broken in current versions of Linux.  (Need to remove this later.)
+
+Rearranged struct's for better efficiency on 64-bit architectures.
+
+Added -i option to rlam so it works with binary input formats.
+
+Added rtcontrib -bn option to specify number of bins and fixed bug
+in recovery of files containing multiple values per record.
+
+Added rtcontrib -fo option to write over existing files, which it now
+refuses to do without this option.
+
+Made rtcontrib flush output when handed a zero-length ray vector,
+to match behavior of rtrace.
+
+Improved color scale for falsecolor output.
+
+Added threshold test for Fresnel approximation to prevent its use
+on smooth surfaces with unrealistically low specularities (less than 1.8%).
+Water has a specular reflectance of 2.1% at room temperture.
+
+Removed NICE macro settings in rpict and rtrace, which was slowing down
+the processes under Mac OS X (10.4) by about 60% due to processor napping.
+
+Made xform, replmarks and rad2mgf handle quoted modifiers and names properly.
+
+Fixed problem in genblinds, where it was generating slats that were too
+wide with the +/-r option.  (Thanks to Helena Buelow-Huebe for discovering
+this bug.)
+
+Fixed bug in ra_ppm for 16-bit/sample i/o, where it was getting the byte
+order wrong (apparently).
+
+Added -V option to rtcontrib to report actual contributions, rather than
+just ray coefficients.
+
+Fixed bug in ranimate that caused it to fail in continuation of renderings.
+
+Renamed librt.a to librtrad.a, to avoid conflict on Solaris. Almost
+everything now gets linked to -lrtrad instead of -lrt.
+
+Fixed problem with large sample sets, so -u+ option now is truly random.
+Thanks to Rick Mistrick and Younju Yoon for identifying this problem,
+which was related to a poorly designed hash function.
+
+Changed -u+ to be the default setting in rtrace (only).
+
+Fixed binary i/o for rlam and vwrays under Windows.
+
+Added tmCvLums() to tone-mapping routines using a 16-bit lookup table
+on IEEE floats, which is also used to improve speed of COLOR conversions,
+especially on machines with slow log() calls.  The first call to
+tmCvLums(), tmCvGrays(), or tmCvColors() initializes the table.
+
+Created optics2rad.csh script to convert from Optics 5 material output
+to something correct for Radiance.  Built on old glazing.cal function,
+which is actually incorrect so removed from the distribution.
+
+Fixed nuisance bug in ximage under some SGI machines that caused it to
+choose an inappropriate visual and display incorrect colors.  (Thanks
+to Oskar Itzinger for debugging the problem.)
+
+Fixed long-standing inaccuracy of pcompos -t and +t thresholding options.
+
+Fixed bug in handling of views with tabs rather than spaces.
+
+Fixed bug related to alias of alias.
+
+****** COMPATIBILITY CHANGE ********
+Changed default sky turbidity in gensky from the original default of
+2.75 to the CIE 110-1994 standard value of 2.45.  Thanks to Marilyne
+Anderson of MIT for pointing out this discrepancy.
+
+Added -o option to ra_xyze to produce original pixel values.
+
+Fixed bug in tracing of virtual sources, where intervening glazing was
+not being accounted for properly.
+
+Added -h option to pcompos and pcomb to eliminate verbose headers.
+
+=====================
+Version 3.9 (Released 3/30/08)
+
+Added -spec option to falsecolor to restore original spectral color scale.
+Also added "-s auto" option to automatically set the maximum value.
+
+Added byte-swapping input and output to rcalc.
+
+Additional error-checking for source surfaces.
+
+Re-fixed bug in octree code that caused it to allocate 8 times as
+much memory as it actually used(!) -- this was pointed out way back
+in 1999 by Erik Reinhard and Erik Jansen, but the fix they gave me
+got lost in the slightly broken release process at the time.  This
+should make a big difference in memory usage, especially for the
+new mesh primitive.  (I measured 30% less memory usage.)
+
+Corrected ray weights for material mixtures.
+
+Reduced the default -n setting for obj2mesh to take better advantage
+of the smaller octree structure size.
+
+Fixed bug in shadow cache where it was adding surfaces with antimatter
+holes cut in them to the obstructor list.  Thanks to John Mardaljevic
+for discovering and reporting the problem.
+
+Adding ability in mkillum to incorporate BSDF data in calculation.
+Internal interface (raypcalls) now used in place of rtrace process(es).
+
+Fixed pixel alignment in pcomb for size reduction and enlargement.
+
+Allow rtcontrib user to set -P and -PP options for persistent rendering.
+The only caveat is that -n setting > 1 requires -PP rather than -P.
+
+Added -c option to rtcontrib to facilitate cumulative calculations.
+
+****** COMPATIBILITY CHANGE ********
+Fixed long-standing bug in source.cal, which caused it to produce
+reversed anisotropic photometric distributions due to the
+misorientation of the y-axis.  Thanks to Zack Rogers for discovering
+and helping debug this problem.
+
+Fixed long-standing bug in replmarks, where triangles with X-side
+aligned with Z-axis would cause incorrect rotations.  Thanks to
+Zack Rogers for finding this error.
+
+Added rsensor program to compute sensor signal for daylighting controls.
+Funding for this component was provided by the Architectural Energy
+Corporation in Boulder, CO, and directed by Zack Rogers.
+
+Added "planisphere" (stereographic) fisheye view type for traditional
+daylighting analysis.  Feature requested & explained by Axel Jacobs.
+
+Modified -c option to rtcontrib so it can take a number of input
+rays to average over, rather than only produce a single accumulated
+record (which can now be done with -c 0).
+
+=====================
+Version 4.0 (Released 3/12/10)
+
+Added -n option to rvu to provide parallel rendering.
+
+****** COMPATIBILITY CHANGE ********
+Changed ".pic" extension to ".hdr" in all sources and documentation
+to improve interoperability with other software, since this has become
+the de facto extension for Radiance RGBE and XYZE pictures.  Since file
+extensions were never more than a convention in Radiance, this does not
+affect operation, but may require the update of scripts, etc. written
+by others that assume the ".pic" suffix for Radiance output.
+
+Added -N option to objview to support multiprocessing.
+
+Improved sampling of circular sources (source, sphere, ring types) with
+quite a bit of help from David Geisler-Moroder.
+
+Added "rpict" and "rvu" variables to rad, and made these as well as
+the "oconv", "mkillum" and "pfilt" variables accept an alternate
+command path in each case.  Change suggested by Lars Grobe based
+on similar Radzilla (radz) facility by Carsten Bauer.
+
+Fixed rad -v N specification to use actual view name if one.
+
+Fixed error in mkillum calculation where it neglected indirect
+source contributions from BTDF illum's.
+
+Added GMT and LATLONG header lines for Greenwich Mean Time and
+degrees North Latitude / East Longitude.
+
+Added gendaylit to distribution (finally).
+
+Added ability in vwright(1) to get view from command line arguments.
+
+Created genklemsamp(1) utility to generate samples suitable for
+BSDF-based annual calculations.  This is the first Perl script to
+be added to Radiance.  Hopefully, others will follow.
+
+Added klems_int.cal file to compute Klems bins for windows.
+
+Created genskyvec  utility to sample a particular sky and
+evaluate average radiance over the standard Tregenza sky patches.
+
+Created dctimestep program to compute a set of sensor values or
+a combined image for a particular time using the daylight
+coefficient method.
+
+Created src/rt/rayfifo.c for first-in/first-out handling of
+multiprocessing by raypcalls.c.
+
+Added -n option to rtrace for executing on multiple cores
+using new rayfifo calls.
+
+=====================
+Version 4.1 (Released 11/04/2011)
+
+Changed ranimate behavior so remote login under a different user
+doesn't necessarily require the presence of the originating user's
+home directory.
+
+Changed standard transmission function normalization back to what
+it was in version 3.5, following recommendation of David Geisler-Moroder,
+who pointed out that the revised BTDF increased too much at grazing.
+
+Changed rad behavior with -N >1 on single view to call rpiece.
+
+Updated SCons build system for MINGW compilation, thanks to Christian
+Kohler.
+
+Added -u option to rlam for unbuffered output.
+
+Modified dctimestep to accept sky vector and daylight coefficient matrix
+or list of images to sum together, as suggested by Andy McNeil.
+
+Created genBSDF script to generate BSDF in Windows XML format.
+
+Modified mkillum to accept detailed geometry from BSDF XML files.
+
+Altered obj2rad to ignore zero normals (thanks to Jack de Valpine for
+suggestions and help).
+
+Fixed bug in genklemsamp that caused non-uniform sampling over surfaces.
+
+Fixed bugs in rhoptimize and rhcopy for 64-bit compilation.
+
+Made a change to avoid problem using gcc --fast-math compile option.
+
+****** COMPATIBILITY CHANGE ********
+Changed behavior of rtrace and rtcontrib so that every scanline is
+not flushed when both -x and -y are set.  This avoids flush delays
+in rtcontrib for large numbers of output files and delays while
+rendering images using rtrace with the -n option.
+
+Added ability for rsensor to output ray origins and directions
+rather than actually loading octree and computing sensor value.
+
+Fixed old bug in obj2rad where it would stop processing and
+report a syntax error if the "void" type is used in the map file.
+
+Updated reflection model according to EGSR 2010 paper by David
+Geisler-Moroder and Arne Duer.
+
+Replaced C-shell version of falsecolor with Perl script written
+by Axel Jacobs.
+
+****** COMPATIBILITY CHANGE ********
+Changed -sj (specular jitter) option to something called specular
+sampling (-ss), which if set less than 1 has the same behavior as
+the old -sj, but when set greater than 1, spawns multiple ray
+samples from semi-specular surfaces.
+
+Fixed bug noticed by Randolph Fritz that caused ambient sync errors.
+
+Fixed bug in findglare for reading picture files under Windows.
+
+Added options to pvalue to note other color spaces on reverse conversion.
+Thanks to Erich Philips for the feature request.
+
+Added BSDF data-driven material type with full sampling support.
+
+Added BRDF calculations to genBSDF.
+
+Bug fixes in rsensor thanks to help from David Geisler-Moroder.
+
+Added variable-resolution BSDF support in renderers and genBSDF.
+
+Created pkgBSDF program to extract BSDF geometry and put it
+together with surface description suitable for inclusion in
+a Radiance scene.
+
+Muted warning for "no light sources found" when there is at least
+one glow object and interreflections are on (-ab > 0).
+
+Fixed long-standing bug that caused underestimation of reflection
+when specular component was below -st threshold in non-metals.
+
+Checked in cross-platform cmake build system created by Bill Hoffman
+of KitWare and sponsored by NREL.  This includes a qt-based
+driver for rvu, which is built in the new subdirectory src/qtrvu.
+
+=====================
+Version 4.2 (Release date 7/31/2014)
+
+Axel Jacobs added -cp and -palettes options to falsecolor.
+
+Fixed bug in matrix output of genBSDF introduced shortly before 4.1 release.
+
+Made rvu more responsive in multi-processing mode when changing parameters.
+Explicit "new" command not needed to show changes, because it goes back
+to "immediate mode" once something is changed.  Processing will be slow
+but response time quick until next "new" command.
+
+Fixed major bug in transmitting proxy material sampling.
+
+Patched cmake build tools (changes by Zack Galbreath).
+
+Removed requirement for pflip -h to be given input file (can pipe from stdin).
+
+Added "Number of processes" slider to trad "Action" pane to control rad -N
+option for rvu and batch rendering.
+
+Added -c option to vwrays to repeat pixels for rtcontrib.
+
+Reworked rtcontrib program and renamed to rcontrib.  New version runs much
+faster, especially on multiprocessor systems, and doesn't require as much
+memory.  No longer calls rtrace; instead does all the work itself.
+
+Added -d option to genskyvec to produce direct-only (sun no sky) vector.
+
+Added Ashikhmin-Shirley anisotropic BRDF model (ashik2) with help
+from Nicolas Boneel.
+
+Added Ruby rewrite of objview.csh by Rob Guglielmetti.
+
+Fixed bug in reciprocity for tensor tree BTDF representations.  Thanks
+to Andy McNeil for identifying the problem.
+
+Added MNAME and ZNAME variables to ranimove for debugging & testing.
+
+Created pmblur2 command to take motion and depth buffers from ranimove
+to compute a better motion blur.
+
+****** COMPATIBILITY CHANGE ********
+Changed BSDF routines to use updated/corrected XML specification and
+removed depracated BSDF support from mkillum.
+
+Fixed behavior of i/o flushing in rcontrib with -c > 1 (averaging).  Thanks
+to Lars Grobe for help identifying this problem.
+
+Fixed bug in depth-of-field blur where view distance was measured from
+fore clipping plane rather than viewpoint.  Thanks to Peter A-B for
+pointing this out.
+
+Added options to dctimestep to allow multiple time steps (-n)
+and multiple output pictures or sensor files (-o).  Also added -i
+option to specify float (-if) or double (-id) input for sky matrix.
+
+Created gendaymtx program to compute annual sky patch matrix based
+on Ian Ashdown's implementation of Perez all-weather sky model.
+Output can be sent directly to dctimestep in ASCII or binary stream.
+
+Replaced existing gendaylit.c with improved version from Wendelin Sprenger
+and Jan Wienold of ISE.
+
+Improved accuracy of ambient calculation for large -ad settings.  Thanks
+to Lars Grobe for noticing the problem.
+
+Added -r option to gendaymtx to rotate the sky the specified number of
+degrees about the zenith as suggested by A. McNeil.
+
+Axel Jacobs added -pal eco color map that does a blue-red-yellow scale.
+
+Created bsdf2klems tool to convert from various BSDF representations to
+Klems basis matrix in XML file.
+
+Fixed problem with inappropriate reciprocity enforcement on tensor
+tree reduction in genBSDF.  (Thanks to A.McNeil for discovering issue.)
+
+Fixed bug in isotropic tensor tree sampling for impinging rays
+exactly normal to surface.  Thanks to Peter Apian-Bennewitz for
+discovering and pointing out the error.
+
+Fixed double-counting bug in mirror material with alternate type.
+Thanks to David Geisler-Moroder for spotting the problem and helping
+to fix it.
+
+Created rcollate program to resize and transpose matrix data for Andy
+McNeil's 5-phase annual simulation method.
+
+Added epw2wea conversion program by Christoph Reinhart.
+
+Implemented Perlin's improved noise function with help from Rahul Narain.
+This will change the appearance of renderings using this function.
+
+Added "origin" command to rvu as requested by John Mardaljevic
+to place view origin at selected point in scene.
+
+Switch to Perl versions of objview and objpict written by Axel Jacobs.
+
+Improved rendering speed of scenes with aliases by not entering new
+modifiers into table if they are the same as the previously defined
+modifier for that name.
+
+Made it so icalc and rcalc search RAYPATH directories for *.cal files
+given on command line.  This simplifies script writing and makes these
+utilities consistent with other tools in Radiance.
+
+Added triangulation routine to handle convex polygons in obj2mesh.
+
+****** COMPATIBILITY CHANGE ********
+Made backface visibility apply to all material types, including
+transparent and translucent materials (except dielectric and interface).
+This makes the option useful in cases where adjacent trans surfaces
+are placed next to each other by a modeler that only understands
+volumetric objects.
+
+Changed dctimestep so that output matrices (-n > 1) are preceded by a
+header, and added support for float and double output formats with -o[fd].
+
+Introduced eplus_adduvf program to compute user view factors for EnergyPlus.
+
+Changed image-plane sampling in rpict to use Hilbert curve, which gives
+less of a brushed/striped appearance to output pixels with -u- (default).
+
+Added ltview and ltpict Perl scripts contributed by Axel Jacobs, inspired
+by Rob Guglielmetti.
+
+Added header variables for NROWS, NCOLS and NCOMP to help standardize
+matrix files.  This functionality has been incorporated into
+rcollate, gendaymtx, and dctimestep.
+
+Created rmtxop utility to operate on multi-component matrices.  This
+facilitates some daylight matrix calculations, and provides a general
+tool for manipulating matrix data.
+
+****** COMPATIBILITY CHANGE ********
+Introduced new Hessian-based error control in irradiance caching (ambient)
+calculation.  Since the format of the stored ambient values is different,
+the old files will be rejected with an error message and must be removed.
+The programs may be compiled with the -DOLDAMB option if this is a problem.
+
+Added -p option to rcontrib to set function file parameters on a per-modifier
+basis to simplify bin evaluation.
+
+Created rfluxmtx program to compute flux transfer matrices from a sender
+surface to one or more receiver surfaces.  (Renamed the file klems_int.cal
+to klems_full.cal in the process.)
+
+Added "-c" option to getinfo to execute command on data segment.
+
+=====================
+Version 4.3
+
+Changed rmtxop so it writes out same type as lesser of inputs unless
+direction otherwise using -f? option.
+
+Changed order of oconv arguments in rfluxmtx so user can specify input
+octree using -i option at the end instead of (or in addition to) a
+list of scene files.
+
+Added support for argument expansion to rfluxmtx and bug fixes.
+
+Fixed bug in indirect hemisphere sampling for some corner cases.
+
+Added default specular lobe to BSDF interpolation.
+
+Set minimum number of shadow checks before direct optimization (4).
+
+(Above changes included in 4.2.1 patch release.)