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Revision 1.96 by greg, Fri Sep 2 04:15:42 2005 UTC vs.
Revision 1.306 by greg, Tue Nov 28 22:16:59 2017 UTC

# Line 1140 | Line 1140 | of recursive routines using sets to avoid overrunning
1140   the stack limit.
1141  
1142   ==============================
1143 < Version 3.6
1143 > Version 3.6 (Released 10/21/04)
1144  
1145   Modified 4-byte RGBE encoding routine to avoid problems
1146   when one or two primary values is negative and the other(s)
# Line 1343 | Line 1343 | Fixed bug in rcalc where it sometimes wasn't parsing t
1343   correctly.
1344  
1345   =====================
1346 < Version 3.7
1346 > Version 3.7 (Released 7/25/05)
1347  
1348   Fixed bug in source occluder cache which caused consistency error
1349   for distant sources and mist materials.  (Thanks to Mark Stock for
# Line 1489 | Line 1489 | line on the input.  This was not intentional, but I de
1489   behavior so I documented it rather than changing it.
1490  
1491   =====================
1492 < Version 3.8
1492 > Version 3.8 (Released 10/17/06)
1493  
1494   Fixed Russian roulette ray termination, which was doing the opposite of
1495   what it should have been doing, resulting in overestimated values below
# Line 1511 | Line 1511 | Fixed bug in antimatter using Russian Roulette samplin
1511   (Above changes included in 3.7.2 patch release 22 Aug 2005.)
1512  
1513   Created fieldcomb script to combine alternate fields in a rendering
1514 < sequence.  (Development generously sponsored by Iebele Atelier.)
1514 > sequence.  (Development generously sponsored by Iebele Abel.)
1515 >
1516 > Added missing preload of mesh objects for more efficient memory use
1517 > during parallel rendering -- this was a serious oversight.
1518 >
1519 > Created ran2tiff program to automate exposure setting of animation
1520 > sequences using a moving histogram in combination with pcond, and
1521 > converting frames to TIFF.
1522 >
1523 > Eliminated SPEED macro from makeall and source tree.
1524 >
1525 > Added -pj option to vwrays to allow jittering of sample locations.
1526 >
1527 > Fixed bug in rtcontrib where it occasionally missed writing the
1528 > final bin file.  (Pretty serious, actually.)
1529 >
1530 > Added -Dfseeko=fseek to MACH= line for linux, as fseeko(3) seems to be
1531 > broken in current versions of Linux.  (Need to remove this later.)
1532 >
1533 > Rearranged struct's for better efficiency on 64-bit architectures.
1534 >
1535 > Added -i option to rlam so it works with binary input formats.
1536 >
1537 > Added rtcontrib -bn option to specify number of bins and fixed bug
1538 > in recovery of files containing multiple values per record.
1539 >
1540 > Added rtcontrib -fo option to write over existing files, which it now
1541 > refuses to do without this option.
1542 >
1543 > Made rtcontrib flush output when handed a zero-length ray vector,
1544 > to match behavior of rtrace.
1545 >
1546 > Improved color scale for falsecolor output.
1547 >
1548 > Added threshold test for Fresnel approximation to prevent its use
1549 > on smooth surfaces with unrealistically low specularities (less than 1.8%).
1550 > Water has a specular reflectance of 2.1% at room temperture.
1551 >
1552 > Removed NICE macro settings in rpict and rtrace, which was slowing down
1553 > the processes under Mac OS X (10.4) by about 60% due to processor napping.
1554 >
1555 > Made xform, replmarks and rad2mgf handle quoted modifiers and names properly.
1556 >
1557 > Fixed problem in genblinds, where it was generating slats that were too
1558 > wide with the +/-r option.  (Thanks to Helena Buelow-Huebe for discovering
1559 > this bug.)
1560 >
1561 > Fixed bug in ra_ppm for 16-bit/sample i/o, where it was getting the byte
1562 > order wrong (apparently).
1563 >
1564 > Added -V option to rtcontrib to report actual contributions, rather than
1565 > just ray coefficients.
1566 >
1567 > Fixed bug in ranimate that caused it to fail in continuation of renderings.
1568 >
1569 > Renamed librt.a to librtrad.a, to avoid conflict on Solaris. Almost
1570 > everything now gets linked to -lrtrad instead of -lrt.
1571 >
1572 > Fixed problem with large sample sets, so -u+ option now is truly random.
1573 > Thanks to Rick Mistrick and Younju Yoon for identifying this problem,
1574 > which was related to a poorly designed hash function.
1575 >
1576 > Changed -u+ to be the default setting in rtrace (only).
1577 >
1578 > Fixed binary i/o for rlam and vwrays under Windows.
1579 >
1580 > Added tmCvLums() to tone-mapping routines using a 16-bit lookup table
1581 > on IEEE floats, which is also used to improve speed of COLOR conversions,
1582 > especially on machines with slow log() calls.  The first call to
1583 > tmCvLums(), tmCvGrays(), or tmCvColors() initializes the table.
1584 >
1585 > Created optics2rad.csh script to convert from Optics 5 material output
1586 > to something correct for Radiance.  Built on old glazing.cal function,
1587 > which is actually incorrect so removed from the distribution.
1588 >
1589 > Fixed nuisance bug in ximage under some SGI machines that caused it to
1590 > choose an inappropriate visual and display incorrect colors.  (Thanks
1591 > to Oskar Itzinger for debugging the problem.)
1592 >
1593 > Fixed long-standing inaccuracy of pcompos -t and +t thresholding options.
1594 >
1595 > Fixed bug in handling of views with tabs rather than spaces.
1596 >
1597 > Fixed bug related to alias of alias.
1598 >
1599 > ****** COMPATIBILITY CHANGE ********
1600 > Changed default sky turbidity in gensky from the original default of
1601 > 2.75 to the CIE 110-1994 standard value of 2.45.  Thanks to Marilyne
1602 > Anderson of MIT for pointing out this discrepancy.
1603 >
1604 > Added -o option to ra_xyze to produce original pixel values.
1605 >
1606 > Fixed bug in tracing of virtual sources, where intervening glazing was
1607 > not being accounted for properly.
1608 >
1609 > Added -h option to pcompos and pcomb to eliminate verbose headers.
1610 >
1611 > =====================
1612 > Version 3.9 (Released 3/30/08)
1613 >
1614 > Added -spec option to falsecolor to restore original spectral color scale.
1615 > Also added "-s auto" option to automatically set the maximum value.
1616 >
1617 > Added byte-swapping input and output to rcalc.
1618 >
1619 > Additional error-checking for source surfaces.
1620 >
1621 > Re-fixed bug in octree code that caused it to allocate 8 times as
1622 > much memory as it actually used(!) -- this was pointed out way back
1623 > in 1999 by Erik Reinhard and Erik Jansen, but the fix they gave me
1624 > got lost in the slightly broken release process at the time.  This
1625 > should make a big difference in memory usage, especially for the
1626 > new mesh primitive.  (I measured 30% less memory usage.)
1627 >
1628 > Corrected ray weights for material mixtures.
1629 >
1630 > Reduced the default -n setting for obj2mesh to take better advantage
1631 > of the smaller octree structure size.
1632 >
1633 > Fixed bug in shadow cache where it was adding surfaces with antimatter
1634 > holes cut in them to the obstructor list.  Thanks to John Mardaljevic
1635 > for discovering and reporting the problem.
1636 >
1637 > Adding ability in mkillum to incorporate BSDF data in calculation.
1638 > Internal interface (raypcalls) now used in place of rtrace process(es).
1639 >
1640 > Fixed pixel alignment in pcomb for size reduction and enlargement.
1641 >
1642 > Allow rtcontrib user to set -P and -PP options for persistent rendering.
1643 > The only caveat is that -n setting > 1 requires -PP rather than -P.
1644 >
1645 > Added -c option to rtcontrib to facilitate cumulative calculations.
1646 >
1647 > ****** COMPATIBILITY CHANGE ********
1648 > Fixed long-standing bug in source.cal, which caused it to produce
1649 > reversed anisotropic photometric distributions due to the
1650 > misorientation of the y-axis.  Thanks to Zack Rogers for discovering
1651 > and helping debug this problem.
1652 >
1653 > Fixed long-standing bug in replmarks, where triangles with X-side
1654 > aligned with Z-axis would cause incorrect rotations.  Thanks to
1655 > Zack Rogers for finding this error.
1656 >
1657 > Added rsensor program to compute sensor signal for daylighting controls.
1658 > Funding for this component was provided by the Architectural Energy
1659 > Corporation in Boulder, CO, and directed by Zack Rogers.
1660 >
1661 > Added "planisphere" (stereographic) fisheye view type for traditional
1662 > daylighting analysis.  Feature requested & explained by Axel Jacobs.
1663 >
1664 > Modified -c option to rtcontrib so it can take a number of input
1665 > rays to average over, rather than only produce a single accumulated
1666 > record (which can now be done with -c 0).
1667 >
1668 > =====================
1669 > Version 4.0 (Released 3/12/10)
1670 >
1671 > Added -n option to rvu to provide parallel rendering.
1672 >
1673 > ****** COMPATIBILITY CHANGE ********
1674 > Changed ".pic" extension to ".hdr" in all sources and documentation
1675 > to improve interoperability with other software, since this has become
1676 > the de facto extension for Radiance RGBE and XYZE pictures.  Since file
1677 > extensions were never more than a convention in Radiance, this does not
1678 > affect operation, but may require the update of scripts, etc. written
1679 > by others that assume the ".pic" suffix for Radiance output.
1680 >
1681 > Added -N option to objview to support multiprocessing.
1682 >
1683 > Improved sampling of circular sources (source, sphere, ring types) with
1684 > quite a bit of help from David Geisler-Moroder.
1685 >
1686 > Added "rpict" and "rvu" variables to rad, and made these as well as
1687 > the "oconv", "mkillum" and "pfilt" variables accept an alternate
1688 > command path in each case.  Change suggested by Lars Grobe based
1689 > on similar Radzilla (radz) facility by Carsten Bauer.
1690 >
1691 > Fixed rad -v N specification to use actual view name if one.
1692 >
1693 > Fixed error in mkillum calculation where it neglected indirect
1694 > source contributions from BTDF illum's.
1695 >
1696 > Added GMT and LATLONG header lines for Greenwich Mean Time and
1697 > degrees North Latitude / East Longitude.
1698 >
1699 > Added gendaylit to distribution (finally).
1700 >
1701 > Added ability in vwright(1) to get view from command line arguments.
1702 >
1703 > Created genklemsamp(1) utility to generate samples suitable for
1704 > BSDF-based annual calculations.  This is the first Perl script to
1705 > be added to Radiance.  Hopefully, others will follow.
1706 >
1707 > Added klems_int.cal file to compute Klems bins for windows.
1708 >
1709 > Created genskyvec  utility to sample a particular sky and
1710 > evaluate average radiance over the standard Tregenza sky patches.
1711 >
1712 > Created dctimestep program to compute a set of sensor values or
1713 > a combined image for a particular time using the daylight
1714 > coefficient method.
1715 >
1716 > Created src/rt/rayfifo.c for first-in/first-out handling of
1717 > multiprocessing by raypcalls.c.
1718 >
1719 > Added -n option to rtrace for executing on multiple cores
1720 > using new rayfifo calls.
1721 >
1722 > =====================
1723 > Version 4.1 (Released 11/04/2011)
1724 >
1725 > Changed ranimate behavior so remote login under a different user
1726 > doesn't necessarily require the presence of the originating user's
1727 > home directory.
1728 >
1729 > Changed standard transmission function normalization back to what
1730 > it was in version 3.5, following recommendation of David Geisler-Moroder,
1731 > who pointed out that the revised BTDF increased too much at grazing.
1732 >
1733 > Changed rad behavior with -N >1 on single view to call rpiece.
1734 >
1735 > Updated SCons build system for MINGW compilation, thanks to Christian
1736 > Kohler.
1737 >
1738 > Added -u option to rlam for unbuffered output.
1739 >
1740 > Modified dctimestep to accept sky vector and daylight coefficient matrix
1741 > or list of images to sum together, as suggested by Andy McNeil.
1742 >
1743 > Created genBSDF script to generate BSDF in Windows XML format.
1744 >
1745 > Modified mkillum to accept detailed geometry from BSDF XML files.
1746 >
1747 > Altered obj2rad to ignore zero normals (thanks to Jack de Valpine for
1748 > suggestions and help).
1749 >
1750 > Fixed bug in genklemsamp that caused non-uniform sampling over surfaces.
1751 >
1752 > Fixed bugs in rhoptimize and rhcopy for 64-bit compilation.
1753 >
1754 > Made a change to avoid problem using gcc --fast-math compile option.
1755 >
1756 > ****** COMPATIBILITY CHANGE ********
1757 > Changed behavior of rtrace and rtcontrib so that every scanline is
1758 > not flushed when both -x and -y are set.  This avoids flush delays
1759 > in rtcontrib for large numbers of output files and delays while
1760 > rendering images using rtrace with the -n option.
1761 >
1762 > Added ability for rsensor to output ray origins and directions
1763 > rather than actually loading octree and computing sensor value.
1764 >
1765 > Fixed old bug in obj2rad where it would stop processing and
1766 > report a syntax error if the "void" type is used in the map file.
1767 >
1768 > Updated reflection model according to EGSR 2010 paper by David
1769 > Geisler-Moroder and Arne Duer.
1770 >
1771 > Replaced C-shell version of falsecolor with Perl script written
1772 > by Axel Jacobs.
1773 >
1774 > ****** COMPATIBILITY CHANGE ********
1775 > Changed -sj (specular jitter) option to something called specular
1776 > sampling (-ss), which if set less than 1 has the same behavior as
1777 > the old -sj, but when set greater than 1, spawns multiple ray
1778 > samples from semi-specular surfaces.
1779 >
1780 > Fixed bug noticed by Randolph Fritz that caused ambient sync errors.
1781 >
1782 > Fixed bug in findglare for reading picture files under Windows.
1783 >
1784 > Added options to pvalue to note other color spaces on reverse conversion.
1785 > Thanks to Erich Philips for the feature request.
1786 >
1787 > Added BSDF data-driven material type with full sampling support.
1788 >
1789 > Added BRDF calculations to genBSDF.
1790 >
1791 > Bug fixes in rsensor thanks to help from David Geisler-Moroder.
1792 >
1793 > Added variable-resolution BSDF support in renderers and genBSDF.
1794 >
1795 > Created pkgBSDF program to extract BSDF geometry and put it
1796 > together with surface description suitable for inclusion in
1797 > a Radiance scene.
1798 >
1799 > Muted warning for "no light sources found" when there is at least
1800 > one glow object and interreflections are on (-ab > 0).
1801 >
1802 > Fixed long-standing bug that caused underestimation of reflection
1803 > when specular component was below -st threshold in non-metals.
1804 >
1805 > Checked in cross-platform cmake build system created by Bill Hoffman
1806 > of KitWare and sponsored by NREL.  This includes a qt-based
1807 > driver for rvu, which is built in the new subdirectory src/qtrvu.
1808 >
1809 > =====================
1810 > Version 4.2 (Release date 7/31/2014)
1811 >
1812 > Axel Jacobs added -cp and -palettes options to falsecolor.
1813 >
1814 > Fixed bug in matrix output of genBSDF introduced shortly before 4.1 release.
1815 >
1816 > Made rvu more responsive in multi-processing mode when changing parameters.
1817 > Explicit "new" command not needed to show changes, because it goes back
1818 > to "immediate mode" once something is changed.  Processing will be slow
1819 > but response time quick until next "new" command.
1820 >
1821 > Fixed major bug in transmitting proxy material sampling.
1822 >
1823 > Patched cmake build tools (changes by Zack Galbreath).
1824 >
1825 > Removed requirement for pflip -h to be given input file (can pipe from stdin).
1826 >
1827 > Added "Number of processes" slider to trad "Action" pane to control rad -N
1828 > option for rvu and batch rendering.
1829 >
1830 > Added -c option to vwrays to repeat pixels for rtcontrib.
1831 >
1832 > Reworked rtcontrib program and renamed to rcontrib.  New version runs much
1833 > faster, especially on multiprocessor systems, and doesn't require as much
1834 > memory.  No longer calls rtrace; instead does all the work itself.
1835 >
1836 > Added -d option to genskyvec to produce direct-only (sun no sky) vector.
1837 >
1838 > Added Ashikhmin-Shirley anisotropic BRDF model (ashik2) with help
1839 > from Nicolas Boneel.
1840 >
1841 > Added Ruby rewrite of objview.csh by Rob Guglielmetti.
1842 >
1843 > Fixed bug in reciprocity for tensor tree BTDF representations.  Thanks
1844 > to Andy McNeil for identifying the problem.
1845 >
1846 > Added MNAME and ZNAME variables to ranimove for debugging & testing.
1847 >
1848 > Created pmblur2 command to take motion and depth buffers from ranimove
1849 > to compute a better motion blur.
1850 >
1851 > ****** COMPATIBILITY CHANGE ********
1852 > Changed BSDF routines to use updated/corrected XML specification and
1853 > removed depracated BSDF support from mkillum.
1854 >
1855 > Fixed behavior of i/o flushing in rcontrib with -c > 1 (averaging).  Thanks
1856 > to Lars Grobe for help identifying this problem.
1857 >
1858 > Fixed bug in depth-of-field blur where view distance was measured from
1859 > fore clipping plane rather than viewpoint.  Thanks to Peter A-B for
1860 > pointing this out.
1861 >
1862 > Added options to dctimestep to allow multiple time steps (-n)
1863 > and multiple output pictures or sensor files (-o).  Also added -i
1864 > option to specify float (-if) or double (-id) input for sky matrix.
1865 >
1866 > Created gendaymtx program to compute annual sky patch matrix based
1867 > on Ian Ashdown's implementation of Perez all-weather sky model.
1868 > Output can be sent directly to dctimestep in ASCII or binary stream.
1869 >
1870 > Replaced existing gendaylit.c with improved version from Wendelin Sprenger
1871 > and Jan Wienold of ISE.
1872 >
1873 > Improved accuracy of ambient calculation for large -ad settings.  Thanks
1874 > to Lars Grobe for noticing the problem.
1875 >
1876 > Added -r option to gendaymtx to rotate the sky the specified number of
1877 > degrees about the zenith as suggested by A. McNeil.
1878 >
1879 > Axel Jacobs added -pal eco color map that does a blue-red-yellow scale.
1880 >
1881 > Created bsdf2klems tool to convert from various BSDF representations to
1882 > Klems basis matrix in XML file.
1883 >
1884 > Fixed problem with inappropriate reciprocity enforcement on tensor
1885 > tree reduction in genBSDF.  (Thanks to A.McNeil for discovering issue.)
1886 >
1887 > Fixed bug in isotropic tensor tree sampling for impinging rays
1888 > exactly normal to surface.  Thanks to Peter Apian-Bennewitz for
1889 > discovering and pointing out the error.
1890 >
1891 > Fixed double-counting bug in mirror material with alternate type.
1892 > Thanks to David Geisler-Moroder for spotting the problem and helping
1893 > to fix it.
1894 >
1895 > Created rcollate program to resize and transpose matrix data for Andy
1896 > McNeil's 5-phase annual simulation method.
1897 >
1898 > Added epw2wea conversion program by Christoph Reinhart.
1899 >
1900 > Implemented Perlin's improved noise function with help from Rahul Narain.
1901 > This will change the appearance of renderings using this function.
1902 >
1903 > Added "origin" command to rvu as requested by John Mardaljevic
1904 > to place view origin at selected point in scene.
1905 >
1906 > Switch to Perl versions of objview and objpict written by Axel Jacobs.
1907 >
1908 > Improved rendering speed of scenes with aliases by not entering new
1909 > modifiers into table if they are the same as the previously defined
1910 > modifier for that name.
1911 >
1912 > Made it so icalc and rcalc search RAYPATH directories for *.cal files
1913 > given on command line.  This simplifies script writing and makes these
1914 > utilities consistent with other tools in Radiance.
1915 >
1916 > Added triangulation routine to handle convex polygons in obj2mesh.
1917 >
1918 > ****** COMPATIBILITY CHANGE ********
1919 > Made backface visibility apply to all material types, including
1920 > transparent and translucent materials (except dielectric and interface).
1921 > This makes the option useful in cases where adjacent trans surfaces
1922 > are placed next to each other by a modeler that only understands
1923 > volumetric objects.
1924 >
1925 > Changed dctimestep so that output matrices (-n > 1) are preceded by a
1926 > header, and added support for float and double output formats with -o[fd].
1927 >
1928 > Introduced eplus_adduvf program to compute user view factors for EnergyPlus.
1929 >
1930 > Changed image-plane sampling in rpict to use Hilbert curve, which gives
1931 > less of a brushed/striped appearance to output pixels with -u- (default).
1932 >
1933 > Added ltview and ltpict Perl scripts contributed by Axel Jacobs, inspired
1934 > by Rob Guglielmetti.
1935 >
1936 > Added header variables for NROWS, NCOLS and NCOMP to help standardize
1937 > matrix files.  This functionality has been incorporated into
1938 > rcollate, gendaymtx, and dctimestep.
1939 >
1940 > Created rmtxop utility to operate on multi-component matrices.  This
1941 > facilitates some daylight matrix calculations, and provides a general
1942 > tool for manipulating matrix data.
1943 >
1944 > ****** COMPATIBILITY CHANGE ********
1945 > Introduced new Hessian-based error control in irradiance caching (ambient)
1946 > calculation.  Since the format of the stored ambient values is different,
1947 > the old files will be rejected with an error message and must be removed.
1948 > The programs may be compiled with the -DOLDAMB option if this is a problem.
1949 >
1950 > Added -p option to rcontrib to set function file parameters on a per-modifier
1951 > basis to simplify bin evaluation.
1952 >
1953 > Created rfluxmtx program to compute flux transfer matrices from a sender
1954 > surface to one or more receiver surfaces.  (Renamed the file klems_int.cal
1955 > to klems_full.cal in the process.)
1956 >
1957 > Added "-c" option to getinfo to execute command on data segment.
1958 >
1959 > ================================
1960 > Version 5.0 (Released 9/18/2015)
1961 >
1962 > Changed rmtxop so it writes out same type as lesser of inputs unless
1963 > directed otherwise using -f? option.
1964 >
1965 > Changed order of oconv arguments in rfluxmtx so user can specify input
1966 > octree using -i option at the end instead of (or in addition to) a
1967 > list of scene files.
1968 >
1969 > Added support for argument expansion to rfluxmtx and bug fixes.
1970 >
1971 > Fixed bug in indirect hemisphere sampling for some corner cases.
1972 >
1973 > Added default specular lobe to BSDF interpolation.
1974 >
1975 > Set minimum number of shadow checks before direct optimization (4).
1976 >
1977 > (Above changes included in 4.2.1 patch release.)
1978 >
1979 > ****** COMPATIBILITY CHANGE ********
1980 > Made header input and output the default behavior for dctimestep and
1981 > genskyvec.
1982 >
1983 > ****** COMPATIBILITY CHANGE ********
1984 > Changed pabopto2bsdf default behavior to add 90-degree rotation
1985 > to bring pgII's definition of "up" in line with Klems axis
1986 > conventions.  Introduced a new header variable "upphi" to
1987 > control this added rotation.  Using "#upphi 90" in each
1988 > BSDF input file gets back the original behavior, where it
1989 > assumes that the up direction is 90-degrees from the X-axis.
1990 > The default value of 0 corresponds to PAB's definition of
1991 > the X-axis as being "up".
1992 >
1993 > Fixed bug in rsensor related to having many rows (altitude) and
1994 > few columns (azimuth) in sensitivity file.
1995 >
1996 > Fixed floating point round-off error in new Hessian calculation
1997 > for some sytems (Windows, primarily).
1998 >
1999 > Fixed bug in tensor tree BSDF code that caused bus error on
2000 > some systems, and may have been source of other errors as well.
2001 >
2002 > (Above changes included in 4.2.2 patch release.)
2003 >
2004 > Improved ambient extrapolation to avoid zero values.  Actual
2005 > threshold set to 5% of recorded value.
2006 >
2007 > Changed anisotropic Gaussian and Ashikhmin models so that
2008 > illegal orientation vectors are dealt with more gracefully.
2009 >
2010 > Created wrapBSDF tool and incorporated into genBSDF along
2011 > with new rfluxmtx computation.
2012 >
2013 > Initial check-in of Roland Schregle's photon map integration.
2014 > New 5.0a version designation as suggested by Andy McNeil.
2015 >
2016 > Added left-hand coordinate sytems to rfluxmtx to correct
2017 > problems with coordinate axis orientations pointed out by
2018 > David Geisler-Moroder.
2019 >
2020 > Added color output to genBSDF (+C option) and support for
2021 > color rendering of Klems and tensor tree data.
2022 >
2023 > Fixed another bug in rsensor that caused rays to be generated
2024 > on opposite side of hemisphere even where sensitivity was zero.
2025 >
2026 > Fixed bug discovered by Jacob Jonsson in Klems BSDF
2027 > interpolator that caused it to over-predict normal
2028 > transmittance and reflectance.
2029 >
2030 > Added ability to read input from commands in dctimestep
2031 > and rmtxop.
2032 >
2033 > Added photon map support to rad.  Fixed some double-counting
2034 > issues in photon-mapping spotted by David Geisler-Moroder.
2035 >
2036 > Added photon map support to trad.
2037 >
2038 > Fixed bug in antimatter source testing when antimatter
2039 > definition follows potential obstructor in input.
2040 >
2041 > Fixed issue with missing character type identifier at head
2042 > of genBSDF XML output.
2043 >
2044 > Prompted by Roland S., added option to have pcompos -a order
2045 > rows from top rather than bottom of image.
2046 >
2047 > Changed dctimestep to accept matrix as well as BTDF input
2048 > in the VTDs invocation mode.  This permits the output of
2049 > rmtxop to be used in a pinch when combining multiple BTDF
2050 > layers, although interreflection between layers is not
2051 > accounted for properly as it is in the WINDOW program.
2052 >
2053 > Added Jan Wienold et al.'s evalglare to distribution.
2054 >
2055 > Hopeful fix to deadlock issue under Mac OS X 10.10.x (Yosemite).
2056 >
2057 > Fixed early exit of rcontrib with internal error (sample behind sender)
2058 > discovered by Rob G.
2059 >
2060 > =================================
2061 > Version 5.1 (Released 8/17/2017)
2062 >
2063 > Fixed issue with vchars.mta and symbols.mta not being installed in
2064 > the appropriate metafile library location, with help from Rob G.
2065 >
2066 > Added ability to give quoted strings to output= directive in rfluxmtx.
2067 >
2068 > ****** COMPATIBILITY CHANGE ********
2069 > Added ability to digest color (CIE-XYZ) input in pabopto2bsdf.
2070 > This change alters the .sir (interpolant) format, so these files
2071 > will need to be regenerated.  Use the new "#colorimetry: CIE-XYZ" tag
2072 > to enable on input.
2073 >
2074 > Rewrote bsdf2klems to support tristimulus color and call wrapBSDF.
2075 > Did the same for bsdf2ttree.  Function specifications still gray only.
2076 >
2077 > Reduced a problem where rvu or rholo would be slow to quit when
2078 > run with many processes on a large model or one with a large
2079 > ambient file (taking lots of memory).  We were waiting for
2080 > processes to quit one-by-one, which takes some time for each
2081 > process as it disentangles its shared memory.  We now
2082 > wait for all the processes together, so they can disentangle
2083 > in parallel.  It can still take up to a minute in some cases,
2084 > but not 10 minutes like it was taking before the fix.
2085 >
2086 > Enabled ambient cache value corral for all levels, not just final two.
2087 > This may reduce errors in certain pathological scenes.
2088 >
2089 > Added -in option to rcalc, rlam, and total to limit the number of
2090 > input records in hopes of circumventing Windows EOF issues on binary data.
2091 > Also added -on option to rcalc and total for logical symmetry.
2092 >
2093 > Increased modifier limit to 10,000 in rcontrib.
2094 >
2095 > Fixed issues with glrad and added zoom response to mouse wheel input.
2096 >
2097 > Added missing definition of "ashik2" material type to reference manual.
2098 >
2099 > Changed genBSDF to calculate device thickness assuming Zmax==0 so
2100 > pkgBSDF will generate correct proxy geometry.
2101 >
2102 > Created pabopto2xyz tool to combine different sensor measurements
2103 > into a single CIE-XYZ measurement file for color BSDF interpolation.
2104 >
2105 > Jan Wienold updated evalglare to version 1.30
2106 >
2107 > Roland Schregle added out-of-core photon mapping routines, which
2108 > may be compiled using the PMAP_OOC macro.
2109 >
2110 > Added -a option to getinfo for easy addition of header lines.
2111 >
2112 > Fixed issue with multiple records on picture output in rcontrib (and rfluxmtx).
2113 > Credit to Sarith Subramaniam for pointing out the problem.
2114 >
2115 > Made mkillum more tolerant of non-planar polygons in its sampling routines.
2116 >
2117 > Added "-recover" option to genBSDF to pick up where it left off.
2118 >
2119 > Fixed genBSDF issue that was created incorrect normalization of
2120 > Klems output.  Thanks to David G-M and Christian Knoflach for
2121 > discovering the error.  Also improved sampling of indirect irradiance
2122 > that showed some slight bias due to poor sample collision avoidance.
2123 >
2124 > Fixed long-standing issue with -aa 0 neglecting textures in calculating
2125 > surface shading.
2126 >
2127 > Fixed bug in ranimove introduced during photon map integration.
2128 >
2129 > Added check for steep sections of BSDF in pabopto2bsdf, creating narrower
2130 > peakes in those places and mitigating some normalization issues.
2131 >
2132 > Added view360stereo.cal by Mark Stock to handle 360-degree over/under
2133 > stereo views.
2134 >
2135 > Added MAX2SHADE macro to place limit on number of light sources
2136 > to precheck for obstructions.  (Currently set to 200.)  This
2137 > avoids excessive start-up times for scenes with many light sources.
2138 > Thanks to Axel Jacobs for pointing out the problem.
2139 >
2140 > Added -v option to obj2mesh to print out mesh statistics.
2141 >
2142 > Rewrote bsdf2rad from ground up and made it a standard part of build.
2143 >
2144 > Fixed bug in orientation of Reinhart/Tregenza sample generator in rfluxmtx.
2145 >
2146 > Added ability to perform shadow-testing through unproxied BSDFs with strong
2147 > through (direct-direct) component.
2148 >
2149 > Added {+|-}a options to genBSDF and bsdf2ttree for switching off reciprocity
2150 > averaging.
2151 >
2152 > Added bias to see through BTDFs with a strong "through" component
2153 > rather than scattering view rays.  This is in lieu of peak extraction,
2154 > which looked to be too difficult from an implementation standpoint.
2155 >
2156 > Added bsdfview tool analogous to objview but for BSDF files (XML and SIR),
2157 > which calls bsdf2rad then rad with a few useful default views.
2158 >
2159 > =========================
2160 > Version 5.2
2161 >
2162 > Created psketch program to apply non-photorealistic rendering to selected
2163 > objects, identified by modifier name(s).
2164 >
2165 > Added '*' and '/' operations to rmtxop for element-wise multiplication and
2166 > division of same-sized matrices.
2167 >
2168 > Changed falsecolor so "-s" option is adjusted to match legend if one.
2169 >
2170 > Legend changes and improvements by David G-M and Stephen W.
2171 >
2172 > Fixed bug in peak extraction code that generated
2173 > "Bad call to SDqueryTreProjSA" error, reported by Lars Grobe.

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