[ViewVC] Diff of: radiance/ray/doc/notes/ReleaseNotes

Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.11 by greg, Fri Aug 29 21:44:17 2003 UTC vs.
Revision 1.397 by greg, Mon Nov 29 16:07:36 2021 UTC

+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)
+parallel.
+Fixed bug where mesh instances were not being freed, so subsequent calls
-<
+in programs like ranimate would refer to bogus data.
->
+in programs like ranimove would refer to bogus data.
+Added support in normtiff for floating-point and 16-bit/sample TIFF input
+files.
+Changed marksources() routine (src/rt/source.c) to check all
+primitives in the modifier chain for emitting types, not only
+the first.  This permits sources to be described with intervening
-<
+modifiers before the light/illum/glow primitive.
->
+modifiers before the light/illum/glow primitive and allows aliases
->
+as well.
+Fixed bug in xform where it was neglecting to add transform arguments
+to new mesh primitive.
-+
-+
+Added -dF and -dD options to pvalue for byte-swapped floats and
-+
+doubles, respectively.
-+
-+
+Changed meta2tga to output correct colors.
-+
-+
+Changed local coordinate index from 32-bits to 16-bits, which requires
-+
+that Radiance mesh files be recompiled.  (Later decided against this
-+
+change, as it caused problems with some models.)
-+
-+
+Changed integer tone-mapping routines to better deal with images
-+
+containing large, constant regions.
-+
-+
+Improved interaction with rholo -o ogl driver under OS X, which was
-+
+returning bad values from the depth buffer.
-+
-+
+Minor bug fix in ranimove where it was restarting processes when it
-+
+didn't need to.
-+
-+
+Increased accuracy of default ambient parameters in rpict, rview, and
-+
+rtrace.  In rad program, doubled -ar value, -ad value, and -as value,
-+
+and decreased -aa value a bit.  Also adjusted -lr upwards and -lw
-+
+downwards.  I should have done these things long ago, as processors
-+
+have been getting faster and faster over the years.
-+
-+
+Fixed bug discovered by Marcus Jacobs where oconv was dumping core
-+
+when it was given too many modifiers.
-+
-+
+Fixed problem with rpict where it was drawing illum sources badly
-+
+even when they weren't all that small in the view.
-+
-+
+Added in(i) function to rcalc for more flexible channel evaluation.
-+
-+
+Replaced all calls to vfork() with regular fork() calls.
-+
-+
+Fixed bug in glarendx for dgr calculation with sources behind view.
-+
-+
+Added -p option to histo to print percentages/percentiles r.t. counts.
-+
-+
+Added a source occluder cache to accelerate shadow testing.  This
-+
+can save up to 50% of the calculation time in scenes with many
-+
+light sources, especially ones containing large occluders.  This
-+
+optimization may be tuned or switched off with the -DSHADCACHE=N
-+
+compile switch, where N is the resolution of the shadow cache, or
-+
+to disable it.  Since this is purely a time vs. memory trade-off,
-+
+I decided not to make it a new command-line option.  (We already
-+
+have plenty.)
-+
-+
+****** COMPATIBILITY CHANGE ********
-+
+Changed the following command names to avoid conflicts:
-+
+        rview -> rvu (with symbolic link back to rview)
-+
+        calc -> icalc
-+
+        lam -> rlam
-+
+        gencat -> gencatenary
-+
-+
+Improved -f option of normpat, which caused odd color changes before.
-+
-+
+Created pgblur script which does fast Gaussian blur of image without changing
-+
+its dimensions.  This is very useful in certain types of image processing
-+
+calculations, such as finding or removing low frequencies.
-+
-+
+****** COMPATIBILITY CHANGE ********
-+
+Changed little-used objpict script so that it takes scene files rather than
-+
+rpict options on the command line, and puts everything into the right
-+
+coordinate position automatically rather than requiring the user to do it.
-+
-+
+Added -I option to replmarks for mesh instancing.
-+
-+
+Made similar change for virtual sources to allow modifiers and aliases
-+
+on the mirror and prism types to work properly.
-+
-+
+Rob Guglielmetti added -lw and -lh options to falsecolor to control the
-+
+legend dimensions.  Made it so -lw 0 and/or -lh 0 turns legend off.
-+
-+
+Made it so pcompos will read everything from a stream even if it doesn't
-+
+need it, so input commands will not receive a hangup signal.
-+
-+
+Wrote ra_bmp program to convert to and from Windows BMP files (finally).
-+
+It's the most horrible image format I've ever seen, and I've seen a lot.
-+
-+
+Increased -aa default value for all renderers (and also -ad and -as in
-+
+rview) at Schorsch's suggestion.  I think this undid my earlier decrease
-+
+of -aa last time, which I guess was ill-considered.
-+
-+
+Modified oconv to keep subdividing the octree if there are too many
-+
+objects in a voxel even when the -r resolution limit has been
-+
+reached.  This was not done before due to problems with recursion,
-+
+and still, it will only continue to 256 times the original -r limit.
-+
+If that isn't enough, then there's probably no hope, anyway.
-+
-+
+Added -l option to obj2mesh to search for material files in library
-+
+locations.
-+
-+
+Increased polygon vertex limit to 512 in obj2mesh and obj2rad and added
-+
+warning if this limit is exceeded.
-+
-+
+Added tone-mapping and monitor primary options to ra_bmp.  This gives
-+
+new functionality similar to normtiff and ximage.  It would be nice to
-+
+add this feature to the other ra_* programs as well...  someday.
-+
-+
+Fixed long-standing bug in reported pixel ordering out of certain
-+
+protate commands.
-+
-+
+Added -p option to rcalc for "passive mode" that transmits
-+
+unrecognized input -- useful for substituting data in the
-+
+middle of a stream.
-+
-+
+Fixed a very obscure bug in rpict that caused a dark horizontal
-+
+line in certain cylindrical projections due to improper drawing
-+
+of the sky dome source in rt/srcdraw.c.
-+
-+
+Fixed problems with effective ray lengths computed for dielectric
-+
+and BRTDfunc materials.  This was most evident in breakup of holodeck
-+
+views when VDISTANCE=True.
-+
-+
+Fixed rad so that 'scene' variable may consist only of inline commands.
-+
-+
+Fixed bug introduced in shadow caching routines where sources in the
-+
+middle of spheres were not illuminating properly.  Thanks to Guilio
-+
+Antonutto for spotting this problem.
-+
-+
+Modified gensky behavior so if time is given with standard time zone
-+
+designation, any -m option is ignored.
-+
-+
+Added -n option to mkillum for (shared memory) parallel processing.
-+
-+
+Fixed a long-standing bug in parallel processing code that only
-+
+seemed to manifest with the new mkillum -n option, where rtrace
-+
+would deadlock upon termination.  The reason it never showed up
-+
+before is because I always closed processes in the reverse order
-+
+of opening them in other programs.  I went through and found similar
-+
+(potential) bugs in the rview device subprocess code and util/netproc.c.
-+
-+
+Corrected the normalization of the Gaussian reflectance model.  This will
-+
+cause an increase in specularity for low-lying light sources.
-+
+Thanks to Don Walters of Boeing and Arne Duer of the Univ. of Innsbruck
-+
+for pointing out this error.  The square root used for the two cosines
-+
+in the denominator of the normalization factor should not be present.
-+
+This was a serious mistake I made in the original model, which went
-+
+undiscovered (at least to my knowledge) for over a decade.  I think
-+
+Bruce Walter of Cornell may have known about it, but I never heard
-+
+the details of his discovery.
-+
-+
+Enabled the -p option for primary conversion without tone-mapping
-+
+in ra_bmp.  Also provides for XYZE input conversion to RGB.
-+
-+
+Fixed what I consider a bug in pvalue -o when taking XYZE files on input,
-+
+where it was inappropriately undoing the exposure value so that it always
-+
+reported radiance rather than XYZ values with Y in cd/m^2.
-+
-+
+Made it so ra_bmp only produces run-length encoded 8-bit output for
-+
+grayscale images that are tone-mapped.  This minimizes circumstances
-+
+under which output scanline order is reversed.
-+
-+
+Fixed bug in rcalc where it sometimes wasn't parsing the input format
-+
+correctly.
-+
-+
+=====================
-+
+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
-+
+finding the problem.)
-+
-+
+Fixed serious bug in source drawing routines for rpict, where the edges
-+
+of light sources were appearing through obstructions.  (Thanks to Veronica
-+
+Sundstedt for pointing this out.)
-+
-+
+(The above were included in the 3.6.1 patch release.)
-+
-+
+Changed default temporary directory from /usr/tmp, which doesn't exist
-+
+on a lot of systems these days, to /tmp.
-+
-+
+Eliminated many unused files and programs from the distribution, including
-+
+the following programs that were being built but no longer used:
-+
+        oki20   - printer driver for OkiMate 20 printer (B&W)
-+
+        oki20c  - printer driver for OkiMate 20 color printer
-+
+        pcwarp  - intended as more general substitute for macbetcal,
-+
+                        but never quite worked
-+
+        ra_avs  - convert to & from AVS image format
-+
+        ra_bn   - convert to & from Barneyscann format
-+
+        ra_pr   - convert to & from 8-bit Sun rasterfile format
-+
+        ra_pr24 - convert to & from 24-bit Sun rasterfile format
-+
+        thf2rad - convert GDS "things file" to Radiance scene format
-+
+If anyone is still wanting any of the above programs, let us know and we'll
-+
+reinstate it.
-+
-+
+Fixed bug in pcond's acuity simulation for small view angles (less than
-+
+degrees horizontally or vertically).  Thanks to James Lee for figuring
-+
+this out.
-+
-+
+Added script to convert to/from ICT's Poskanzer Float Map, which I don't
-+
+care to support officially due to its machine-dependent byte order.
-+
-+
+Fixed bug that caused incorrect reporting of non-surface in set when
-+
+mixing meshes and instances.  (Thanks to Jack de Valpine for discovery.)
-+
-+
+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.
-+
-+
+Made internal change to tone-mapping library to use structure pointer
-+
+rather than stack, making code re-entrant and more up to modern standards.
-+
-+
+Added -pd option to handle depth-of-field blur in rpict.  This requires
-+
+that the view directon (-vd option) include focal distance information,
-+
+which is now preserved by the various view file routines, and reported
-+
+by the vwright command.
-+
-+
+Added DBLUR variable to ranimate and pmdblur script to handle simultaneous
-+
+motion and depth-of-field blurring.  Thanks to Visarc for funding this work.
-+
-+
+Added setting of focus distance in rvu ("focus" command) and rholo
-+
+('f'/"frame" command).
-+
-+
+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.
-+
-+
+Added cct_x(t) and cct_y(t) to src/cal/cal/blackbody.cal to interpolate
-+
+CIE chromaticities for particular black-body temperatures.
-+
-+
+Increased maximum number of input pictures in pcomb and pcompos to 512.
-+
-+
+Created rtcontrib program for computing ray contribution coefficients.
-+
+This tool may be used to do standard optical ray tracing or daylight
-+
+coefficient calculations for annual simulations, among other uses.
-+
-+
+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
-+
+.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 5.0 (Released 9/18/2015)
-+
-+
+Changed rmtxop so it writes out same type as lesser of inputs unless
-+
+directed 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.)
-+
-+
+****** COMPATIBILITY CHANGE ********
-+
+Made header input and output the default behavior for dctimestep and
-+
+genskyvec.
-+
-+
+****** COMPATIBILITY CHANGE ********
-+
+Changed pabopto2bsdf default behavior to add 90-degree rotation
-+
+to bring pgII's definition of "up" in line with Klems axis
-+
+conventions.  Introduced a new header variable "upphi" to
-+
+control this added rotation.  Using "#upphi 90" in each
-+
+BSDF input file gets back the original behavior, where it
-+
+assumes that the up direction is 90-degrees from the X-axis.
-+
+The default value of 0 corresponds to PAB's definition of
-+
+the X-axis as being "up".
-+
-+
+Fixed bug in rsensor related to having many rows (altitude) and
-+
+few columns (azimuth) in sensitivity file.
-+
-+
+Fixed floating point round-off error in new Hessian calculation
-+
+for some sytems (Windows, primarily).
-+
-+
+Fixed bug in tensor tree BSDF code that caused bus error on
-+
+some systems, and may have been source of other errors as well.
-+
-+
+(Above changes included in 4.2.2 patch release.)
-+
-+
+Improved ambient extrapolation to avoid zero values.  Actual
-+
+threshold set to 5% of recorded value.
-+
-+
+Changed anisotropic Gaussian and Ashikhmin models so that
-+
+illegal orientation vectors are dealt with more gracefully.
-+
-+
+Created wrapBSDF tool and incorporated into genBSDF along
-+
+with new rfluxmtx computation.
-+
-+
+Initial check-in of Roland Schregle's photon map integration.
-+
+New 5.0a version designation as suggested by Andy McNeil.
-+
-+
+Added left-hand coordinate sytems to rfluxmtx to correct
-+
+problems with coordinate axis orientations pointed out by
-+
+David Geisler-Moroder.
-+
-+
+Added color output to genBSDF (+C option) and support for
-+
+color rendering of Klems and tensor tree data.
-+
-+
+Fixed another bug in rsensor that caused rays to be generated
-+
+on opposite side of hemisphere even where sensitivity was zero.
-+
-+
+Fixed bug discovered by Jacob Jonsson in Klems BSDF
-+
+interpolator that caused it to over-predict normal
-+
+transmittance and reflectance.
-+
-+
+Added ability to read input from commands in dctimestep
-+
+and rmtxop.
-+
-+
+Added photon map support to rad.  Fixed some double-counting
-+
+issues in photon-mapping spotted by David Geisler-Moroder.
-+
-+
+Added photon map support to trad.
-+
-+
+Fixed bug in antimatter source testing when antimatter
-+
+definition follows potential obstructor in input.
-+
-+
+Fixed issue with missing character type identifier at head
-+
+of genBSDF XML output.
-+
-+
+Prompted by Roland S., added option to have pcompos -a order
-+
+rows from top rather than bottom of image.
-+
-+
+Changed dctimestep to accept matrix as well as BTDF input
-+
+in the VTDs invocation mode.  This permits the output of
-+
+rmtxop to be used in a pinch when combining multiple BTDF
-+
+layers, although interreflection between layers is not
-+
+accounted for properly as it is in the WINDOW program.
-+
-+
+Added Jan Wienold et al.'s evalglare to distribution.
-+
-+
+Hopeful fix to deadlock issue under Mac OS X 10.10.x (Yosemite).
-+
-+
+Fixed early exit of rcontrib with internal error (sample behind sender)
-+
+discovered by Rob G.
-+
-+
+=================================
-+
+Version 5.1 (Released 8/17/2017)
-+
-+
+Fixed issue with vchars.mta and symbols.mta not being installed in
-+
+the appropriate metafile library location, with help from Rob G.
-+
-+
+Added ability to give quoted strings to output= directive in rfluxmtx.
-+
-+
+****** COMPATIBILITY CHANGE ********
-+
+Added ability to digest color (CIE-XYZ) input in pabopto2bsdf.
-+
+This change alters the .sir (interpolant) format, so these files
-+
+will need to be regenerated.  Use the new "#colorimetry: CIE-XYZ" tag
-+
+to enable on input.
-+
-+
+Rewrote bsdf2klems to support tristimulus color and call wrapBSDF.
-+
+Did the same for bsdf2ttree.  Function specifications still gray only.
-+
-+
+Reduced a problem where rvu or rholo would be slow to quit when
-+
+run with many processes on a large model or one with a large
-+
+ambient file (taking lots of memory).  We were waiting for
-+
+processes to quit one-by-one, which takes some time for each
-+
+process as it disentangles its shared memory.  We now
-+
+wait for all the processes together, so they can disentangle
-+
+in parallel.  It can still take up to a minute in some cases,
-+
+but not 10 minutes like it was taking before the fix.
-+
-+
+Enabled ambient cache value corral for all levels, not just final two.
-+
+This may reduce errors in certain pathological scenes.
-+
-+
+Added -in option to rcalc, rlam, and total to limit the number of
-+
+input records in hopes of circumventing Windows EOF issues on binary data.
-+
+Also added -on option to rcalc and total for logical symmetry.
-+
-+
+Increased modifier limit to 10,000 in rcontrib.
-+
-+
+Fixed issues with glrad and added zoom response to mouse wheel input.
-+
-+
+Added missing definition of "ashik2" material type to reference manual.
-+
-+
+Changed genBSDF to calculate device thickness assuming Zmax==0 so
-+
+pkgBSDF will generate correct proxy geometry.
-+
-+
+Created pabopto2xyz tool to combine different sensor measurements
-+
+into a single CIE-XYZ measurement file for color BSDF interpolation.
-+
-+
+Jan Wienold updated evalglare to version 1.30
-+
-+
+Roland Schregle added out-of-core photon mapping routines, which
-+
+may be compiled using the PMAP_OOC macro.
-+
-+
+Added -a option to getinfo for easy addition of header lines.
-+
-+
+Fixed issue with multiple records on picture output in rcontrib (and rfluxmtx).
-+
+Credit to Sarith Subramaniam for pointing out the problem.
-+
-+
+Made mkillum more tolerant of non-planar polygons in its sampling routines.
-+
-+
+Added "-recover" option to genBSDF to pick up where it left off.
-+
-+
+Fixed genBSDF issue that was created incorrect normalization of
-+
+Klems output.  Thanks to David G-M and Christian Knoflach for
-+
+discovering the error.  Also improved sampling of indirect irradiance
-+
+that showed some slight bias due to poor sample collision avoidance.
-+
-+
+Fixed long-standing issue with -aa 0 neglecting textures in calculating
-+
+surface shading.
-+
-+
+Fixed bug in ranimove introduced during photon map integration.
-+
-+
+Added check for steep sections of BSDF in pabopto2bsdf, creating narrower
-+
+peakes in those places and mitigating some normalization issues.
-+
-+
+Added view360stereo.cal by Mark Stock to handle 360-degree over/under
-+
+stereo views.
-+
-+
+Added MAX2SHADE macro to place limit on number of light sources
-+
+to precheck for obstructions.  (Currently set to 200.)  This
-+
+avoids excessive start-up times for scenes with many light sources.
-+
+Thanks to Axel Jacobs for pointing out the problem.
-+
-+
+Added -v option to obj2mesh to print out mesh statistics.
-+
-+
+Rewrote bsdf2rad from ground up and made it a standard part of build.
-+
-+
+Fixed bug in orientation of Reinhart/Tregenza sample generator in rfluxmtx.
-+
-+
+Added ability to perform shadow-testing through unproxied BSDFs with strong
-+
+through (direct-direct) component.
-+
-+
+Added {+|-}a options to genBSDF and bsdf2ttree for switching off reciprocity
-+
+averaging.
-+
-+
+Added bias to see through BTDFs with a strong "through" component
-+
+rather than scattering view rays.  This is in lieu of peak extraction,
-+
+which looked to be too difficult from an implementation standpoint.
-+
-+
+Added bsdfview tool analogous to objview but for BSDF files (XML and SIR),
-+
+which calls bsdf2rad then rad with a few useful default views.
-+
-+
+=========================
-+
+Version 5.2 (Release October 8, 2018)
-+
-+
+Created psketch program to apply non-photorealistic rendering to selected
-+
+objects, identified by modifier name(s).
-+
-+
+Added '*' and '/' operations to rmtxop for element-wise multiplication and
-+
+division of same-sized matrices.
-+
-+
+Changed falsecolor so "-s" option is adjusted to match legend if one.
-+
-+
+Falsecolor legend changes and improvements by David G-M and Stephen W.
-+
-+
+Fixed bug in peak extraction code that generated
-+
+"Bad call to SDqueryTreProjSA" error, reported by Lars Grobe.
-+
-+
+Increased maximum luminance to 10^7 in pcond to fix issue noticed
-+
+by Axel Jacobs where veiling glare not added for the sun under
-+
+some conditions.
-+
-+
+Increased maximum number of open files in rcontrib to the system upper
-+
+limit of 2048 rather than the default 512 under Windows.
-+
-+
+Added top-level resources directory with files from Rob Guglielmetti.
-+
-+
+Improved accuracy for peaky BSDFs and small light sources.
-+
-+
+Fixed issue with pmapdump noted by Axel Jacobs.
-+
-+
+Improved accuracy of bsdf2ttree when converting scattering interpolation
-+
+representatons with strong peaks.
-+
-+
+Tweaked peak-extraction code to work more reliably.
-+
-+
+Georg Mischler updated SCons build system.
-+
-+
+Rob Guglielmetti and Alex Swindler updated CMake build system.
-+
-+
+Modified pcomb so the first view seen in the inputs is written into header.
-+
-+
+Wrote rtpict script to run rtrace in parallel mode and simulate rpict with
-+
+-n option.
-+
-+
+Added ability to move forwards/backwards specified distance in rvu "origin"
-+
+command.  Feature requested by John Mardaljevic, who essentially owns this
-+
+command, now.
-+
-+
+Reduced bias in ambient super-sampling method.
-+
-+
+Fixed bugs associated with zero transmission in chromatic tensor trees.
-+
+Thanks to Lars Grobe for pointing out issues.
-+
-+
+Added RAYPATH searching for -f options to genrev, gensurf, genworm,
-+
+bsdf2klems, bsdf2ttree, and pcomb.  This makes behavior consistent
-+
+with rcalc, calc, and rendering tools.
-+
-+
+Worked with Randolph Fritz to fix some issues with ies2rad and newer
-+
+IESNA63 standards.
-+
-+
+Resurrected original bsdf2rad test program, renaming it bsdf2rado. Still an
-+
+optional build in src/cv/.
-+
-+
+Fixed bug in rcontrib with virtual sources, where pretest was adding
-+
+to modifier accumulation buffers.  Reported by Mostapha.
-+
-+
+Added an "aBSDF" material type that explicitly checks for peak extraction.
-+
+Its arguments are the same as the original "BSDF" type, but without the
-+
+thickness parameter, as proxy geometry is not supported by this new type.
-+
+The old "BSDF" type no longer does peak extraction under any circumstances,
-+
+since this behavior is superfluous for proxied geometry.
-+
-+
+Added -r option to bsdf2rad (and bsdfview) to fix BSDF min and max range
-+
+for comparing BSDFs.
-+
-+
+Fixed issue with pfilt -m option and uneven image size changes pointed
-+
+out by Rob Shakespeare.
-+
-+
+Updates to evalglare and gendaylit from Jan Wienold, including new
-+
+colored sky option.
-+
-+
+=========================
-+
+Version 5.3 (Released September 1, 2020)
-+
-+
+Created radcompare program to compare Radiance tool output to reference outputs
-+
+during unit-testing.
-+
-+
+Fixed issue reading very large files (> 2 GBytes) in rcollate.
-+
-+
+Made picking function in rvu ignore transparent and void surfaces.
-+
-+
+Added -orRxX options to rtrace to enable output of mirrored and unmirrored
-+
+contributions and distances to enable new types of reprojections.  This also
-+
+cleaned up and unified handling of effective ray lengths throughout code.
-+
-+
+Bug fixes from Jan Wienold for evalglare.
-+
-+
+Changed indexed (numbered) output from dctimestep to start from 0 rather
-+
+than 1, to make it more consistent with expected input naming.
-+
-+
+Increased default sampling in bsdf2klems (-n option) to 1024.
-+
-+
+Fixed an issue noticed by David G-M that was causing genBSDF to bias
-+
+isotropic tensor tree samples resulting in subsequent failure of
-+
+peak extraction with "aBSDF" type.
-+
-+
+Introduced max() and min() functions to .cal library.
-+
-+
+Added random incident patch sampling to bsdf2klems to improve accuracy
-+
+with scattering interpolation representation input (e.g., from
-+
+pabopto2bsdf).  The other input types already sampled incident patch area.
-+
-+
+Added gendaymtx -A option to compute average sky over all the input
-+
+time steps.
-+
-+
+Added ability to output color image from rtrace with any of -ovrx options.
-+
+Also fixed inconsistency of -oN output when ray casting versus full trace.
-+
+Before, it would flip normal to front side unless ray casting.  Now, -oN
-+
+always reports the unflipped normal.
-+
-+
+Changed rlam behavior so -iaN reads N lines from a stream rather than N
-+
+characters.  This seems more useful, since -ibN is somewhat redundant with
-+
+the old behavior.
-+
-+
+Created rsplit program as compliment to rlam and to handle more complex
-+
+rtrace output into separate files or streams.
-+
-+
+Improved getinfo so that it can also hop over resolution string with -c
-+
+and header elide mode.  Use +d to include resolution string in output,
-+
+and -d to elide with - and -c options.
-+
-+
+Made pvalue -u option mean "uncompressed" with -r.  Also, allow skipping
-+
+bytes on standard input.
-+
-+
+Created rcode_depth tool to convert to and from a 16-bit/pixel portable
-+
+depth image encoding that uses a mix of linear and reciprocal distance
-+
+with explicit representations of 0 and infinity.  Code for loading these
-+
+depth maps is in src/common/depthcodec.{h,c}.
-+
-+
+Created rcode_norm tool to convert to and from 32-bit/pixel portable
-+
+surface normal representation, matching the one in src/common/dircode.c.
-+
+Code for loading normal maps is in src/common/normcodec.{h,c}.
-+
-+
+Created rcode_ident tool to create indexed identifier files.
-+
+Code for loading these files is in src/common/idmap.{h,c}.
-+
-+
+Added -o* option to rtpict to produce layered images that handle most
-+
+output types from rtrace (colors, surface normals, distances, IDs).
-+
-+
+Created rcode2bmp script to create images from new rcode_* output maps.
-+
-+
+Improved efficiency of rmtxop in cases where matrix multiplication is
-+
+faster evaluated right-to-left, as when the final component is a
-+
+column vector.  Also added ability to apply trailing unary operators
-+
+(-t, and -s or -c) to resulting matrix.
-+
-+
+Added new depth, normal, and ID file types to radcompare.
-+
-+
+Added BigEndian= header line for automatic byte-swapping in rmtxop
-+
+and radcompare.
-+
-+
+Added new "turbo" palette to falsecolor (thanks to Taoning).
-+
-+
+Nathaniel Jones created the "dcglare" program for annual glare
-+
+simulations when the sun and sky are visible through the window.
-+
+Tutorial is posted at
-+
+"https://github.com/nljones/Accelerad/wiki/The-Imageless-Method-for-Spatial-and-Annual-Glare-Analysis".
-+
-+
+Added support for loading RGBE images into matrices in dctimestep.
-+
-+
+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
-+
+between whitespace.
-+
-+
+Added ability of vwrays, pinterp, and pmblur2 to read encoded depth files.
-+
-+
+Added -o RxCxR1xC1 facility to perform blocking in rcollate.
-+
-+
+Made it so number of segments in genworm, genrev, and gensurf can be
-+
+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.  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.
-+
-+
+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.
-+
-+
+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:
-+
-+
+. Generates correct Radiance geometry for spheres in 1995, 2002,
-+
+        and 2019 IES files.
-+
-+
+. Generates correct Radiance geometry for vertical cylinders that
-+
+        are taller than they are wide.
-+
-+
+. Ignores the file source ("File Generation Type") field in the
-+
+version of the file, which would otherwise be incorrectly used
-+
+        as an output multiplier.
-+
-+
+    It also offers the following enhancements:
-+
-+
+. Shape information is included in the .rad file comments.
-+
-+
+. 1995, 2002, and 2019-version luminous opening geometry is
-+
+        accounted for.
-+
-+
+. The 2002 and 2019 IES file versions are recognized and
-+
+        processed appropriately.
-+
-+
+. 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.

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Comparing ray/doc/notes/ReleaseNotes (file contents): Revision 1.11 by greg, Fri Aug 29 21:44:17 2003 UTC vs. Revision 1.397 by greg, Mon Nov 29 16:07:36 2021 UTC

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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.11 by greg, Fri Aug 29 21:44:17 2003 UTC vs.
Revision 1.397 by greg, Mon Nov 29 16:07:36 2021 UTC