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Revision 1.2 by greg, Tue Mar 18 04:45:28 2003 UTC vs.
Revision 1.219 by greg, Mon Aug 5 22:56:50 2013 UTC

# Line 921 | Line 921 | Fixed bug in Type B photometry angle calculation in so
921   by Erich Phillips.
922  
923   ==============================
924 < Version 3.5 (Released 3/14/03)
924 > Version 3.5 (Released 3/21/03)
925  
926   Fixed bug in replmarks pointed out by Georg Mischler, which caused
927   garbage to be output under specific conditions (unscaled, unrotated
# Line 1138 | Line 1138 | models where many faces come together at a point.
1138   This required a little reprogramming in for couple
1139   of recursive routines using sets to avoid overrunning
1140   the stack limit.
1141 +
1142 + ==============================
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)
1147 + positive.  This used to generate some strange color values.
1148 +
1149 + Added -oc option to rtrace to output local (u,v) coordinates.
1150 +
1151 + Fixed bugs in local uv and j unit vector variables in src/rt/func.c.
1152 +
1153 + Added warning message to OpenGL rendering routines about new
1154 + mesh primitive, which we cannot currently render.
1155 +
1156 + Added -if, -id, -of, and -od options to rcalc to provide for
1157 + binary float and double i/o.
1158 +
1159 + ****************** COMPATIBILITY CHANGE ***********************
1160 + Changed holodeck format to used off_t instead of long for beam
1161 + positions, which allows holodecks to grow to system file size limit.
1162 +
1163 + Fixed wrapping long in source hit test code, which would cause
1164 + odd horizontal lines in some very long renderings.
1165 +
1166 + Added -f and -w options to ra_tiff to create IEEE float and 16-bit/primary
1167 + TIFF output, respectively.  These formats are also understood on reverse
1168 + conversion.  (16-bit/primary has been understood for some time, but not
1169 + IEEE float.)
1170 +
1171 + Added -N option to rad to start multiple rendering processes in
1172 + parallel.
1173 +
1174 + Fixed bug where mesh instances were not being freed, so subsequent calls
1175 + in programs like ranimove would refer to bogus data.
1176 +
1177 + Added support in normtiff for floating-point and 16-bit/sample TIFF input
1178 + files.
1179 +
1180 + Changed marksources() routine (src/rt/source.c) to check all
1181 + primitives in the modifier chain for emitting types, not only
1182 + the first.  This permits sources to be described with intervening
1183 + modifiers before the light/illum/glow primitive and allows aliases
1184 + as well.
1185 +
1186 + Fixed bug in xform where it was neglecting to add transform arguments
1187 + to new mesh primitive.
1188 +
1189 + Added -dF and -dD options to pvalue for byte-swapped floats and
1190 + doubles, respectively.
1191 +
1192 + Changed meta2tga to output correct colors.
1193 +
1194 + Changed local coordinate index from 32-bits to 16-bits, which requires
1195 + that Radiance mesh files be recompiled.  (Later decided against this
1196 + change, as it caused problems with some models.)
1197 +
1198 + Changed integer tone-mapping routines to better deal with images
1199 + containing large, constant regions.
1200 +
1201 + Improved interaction with rholo -o ogl driver under OS X, which was
1202 + returning bad values from the depth buffer.
1203 +
1204 + Minor bug fix in ranimove where it was restarting processes when it
1205 + didn't need to.
1206 +
1207 + Increased accuracy of default ambient parameters in rpict, rview, and
1208 + rtrace.  In rad program, doubled -ar value, -ad value, and -as value,
1209 + and decreased -aa value a bit.  Also adjusted -lr upwards and -lw
1210 + downwards.  I should have done these things long ago, as processors
1211 + have been getting faster and faster over the years.
1212 +
1213 + Fixed bug discovered by Marcus Jacobs where oconv was dumping core
1214 + when it was given too many modifiers.
1215 +
1216 + Fixed problem with rpict where it was drawing illum sources badly
1217 + even when they weren't all that small in the view.
1218 +
1219 + Added in(i) function to rcalc for more flexible channel evaluation.
1220 +
1221 + Replaced all calls to vfork() with regular fork() calls.
1222 +
1223 + Fixed bug in glarendx for dgr calculation with sources behind view.
1224 +
1225 + Added -p option to histo to print percentages/percentiles r.t. counts.
1226 +
1227 + Added a source occluder cache to accelerate shadow testing.  This
1228 + can save up to 50% of the calculation time in scenes with many
1229 + light sources, especially ones containing large occluders.  This
1230 + optimization may be tuned or switched off with the -DSHADCACHE=N
1231 + compile switch, where N is the resolution of the shadow cache, or
1232 + 0 to disable it.  Since this is purely a time vs. memory trade-off,
1233 + I decided not to make it a new command-line option.  (We already
1234 + have plenty.)
1235 +
1236 + ****** COMPATIBILITY CHANGE ********
1237 + Changed the following command names to avoid conflicts:
1238 +        rview -> rvu (with symbolic link back to rview)
1239 +        calc -> icalc
1240 +        lam -> rlam
1241 +        gencat -> gencatenary
1242 +
1243 + Improved -f option of normpat, which caused odd color changes before.
1244 +
1245 + Created pgblur script which does fast Gaussian blur of image without changing
1246 + its dimensions.  This is very useful in certain types of image processing
1247 + calculations, such as finding or removing low frequencies.
1248 +
1249 + ****** COMPATIBILITY CHANGE ********
1250 + Changed little-used objpict script so that it takes scene files rather than
1251 + rpict options on the command line, and puts everything into the right
1252 + coordinate position automatically rather than requiring the user to do it.
1253 +
1254 + Added -I option to replmarks for mesh instancing.
1255 +
1256 + Made similar change for virtual sources to allow modifiers and aliases
1257 + on the mirror and prism types to work properly.
1258 +
1259 + Rob Guglielmetti added -lw and -lh options to falsecolor to control the
1260 + legend dimensions.  Made it so -lw 0 and/or -lh 0 turns legend off.
1261 +
1262 + Made it so pcompos will read everything from a stream even if it doesn't
1263 + need it, so input commands will not receive a hangup signal.
1264 +
1265 + Wrote ra_bmp program to convert to and from Windows BMP files (finally).
1266 + It's the most horrible image format I've ever seen, and I've seen a lot.
1267 +
1268 + Increased -aa default value for all renderers (and also -ad and -as in
1269 + rview) at Schorsch's suggestion.  I think this undid my earlier decrease
1270 + of -aa last time, which I guess was ill-considered.
1271 +
1272 + Modified oconv to keep subdividing the octree if there are too many
1273 + objects in a voxel even when the -r resolution limit has been
1274 + reached.  This was not done before due to problems with recursion,
1275 + and still, it will only continue to 256 times the original -r limit.
1276 + If that isn't enough, then there's probably no hope, anyway.
1277 +
1278 + Added -l option to obj2mesh to search for material files in library
1279 + locations.
1280 +
1281 + Increased polygon vertex limit to 512 in obj2mesh and obj2rad and added
1282 + warning if this limit is exceeded.
1283 +
1284 + Added tone-mapping and monitor primary options to ra_bmp.  This gives
1285 + new functionality similar to normtiff and ximage.  It would be nice to
1286 + add this feature to the other ra_* programs as well...  someday.
1287 +
1288 + Fixed long-standing bug in reported pixel ordering out of certain
1289 + protate commands.
1290 +
1291 + Added -p option to rcalc for "passive mode" that transmits
1292 + unrecognized input -- useful for substituting data in the
1293 + middle of a stream.
1294 +
1295 + Fixed a very obscure bug in rpict that caused a dark horizontal
1296 + line in certain cylindrical projections due to improper drawing
1297 + of the sky dome source in rt/srcdraw.c.
1298 +
1299 + Fixed problems with effective ray lengths computed for dielectric
1300 + and BRTDfunc materials.  This was most evident in breakup of holodeck
1301 + views when VDISTANCE=True.
1302 +
1303 + Fixed rad so that 'scene' variable may consist only of inline commands.
1304 +
1305 + Fixed bug introduced in shadow caching routines where sources in the
1306 + middle of spheres were not illuminating properly.  Thanks to Guilio
1307 + Antonutto for spotting this problem.
1308 +
1309 + Modified gensky behavior so if time is given with standard time zone
1310 + designation, any -m option is ignored.
1311 +
1312 + Added -n option to mkillum for (shared memory) parallel processing.
1313 +
1314 + Fixed a long-standing bug in parallel processing code that only
1315 + seemed to manifest with the new mkillum -n option, where rtrace
1316 + would deadlock upon termination.  The reason it never showed up
1317 + before is because I always closed processes in the reverse order
1318 + of opening them in other programs.  I went through and found similar
1319 + (potential) bugs in the rview device subprocess code and util/netproc.c.
1320 +
1321 + Corrected the normalization of the Gaussian reflectance model.  This will
1322 + cause an increase in specularity for low-lying light sources.
1323 + Thanks to Don Walters of Boeing and Arne Duer of the Univ. of Innsbruck
1324 + for pointing out this error.  The square root used for the two cosines
1325 + in the denominator of the normalization factor should not be present.
1326 + This was a serious mistake I made in the original model, which went
1327 + undiscovered (at least to my knowledge) for over a decade.  I think
1328 + Bruce Walter of Cornell may have known about it, but I never heard
1329 + the details of his discovery.
1330 +
1331 + Enabled the -p option for primary conversion without tone-mapping
1332 + in ra_bmp.  Also provides for XYZE input conversion to RGB.
1333 +
1334 + Fixed what I consider a bug in pvalue -o when taking XYZE files on input,
1335 + where it was inappropriately undoing the exposure value so that it always
1336 + reported radiance rather than XYZ values with Y in cd/m^2.
1337 +
1338 + Made it so ra_bmp only produces run-length encoded 8-bit output for
1339 + grayscale images that are tone-mapped.  This minimizes circumstances
1340 + under which output scanline order is reversed.
1341 +
1342 + Fixed bug in rcalc where it sometimes wasn't parsing the input format
1343 + correctly.
1344 +
1345 + =====================
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
1350 + finding the problem.)
1351 +
1352 + Fixed serious bug in source drawing routines for rpict, where the edges
1353 + of light sources were appearing through obstructions.  (Thanks to Veronica
1354 + Sundstedt for pointing this out.)
1355 +
1356 + (The above were included in the 3.6.1 patch release.)
1357 +
1358 + Changed default temporary directory from /usr/tmp, which doesn't exist
1359 + on a lot of systems these days, to /tmp.
1360 +
1361 + Eliminated many unused files and programs from the distribution, including
1362 + the following programs that were being built but no longer used:
1363 +        oki20   - printer driver for OkiMate 20 printer (B&W)
1364 +        oki20c  - printer driver for OkiMate 20 color printer
1365 +        pcwarp  - intended as more general substitute for macbetcal,
1366 +                        but never quite worked
1367 +        ra_avs  - convert to & from AVS image format
1368 +        ra_bn   - convert to & from Barneyscann format
1369 +        ra_pr   - convert to & from 8-bit Sun rasterfile format
1370 +        ra_pr24 - convert to & from 24-bit Sun rasterfile format
1371 +        thf2rad - convert GDS "things file" to Radiance scene format
1372 + If anyone is still wanting any of the above programs, let us know and we'll
1373 + reinstate it.
1374 +
1375 + Fixed bug in pcond's acuity simulation for small view angles (less than
1376 + 4 degrees horizontally or vertically).  Thanks to James Lee for figuring
1377 + this out.
1378 +
1379 + Added script to convert to/from ICT's Poskanzer Float Map, which I don't
1380 + care to support officially due to its machine-dependent byte order.
1381 +
1382 + Fixed bug that caused incorrect reporting of non-surface in set when
1383 + mixing meshes and instances.  (Thanks to Jack de Valpine for discovery.)
1384 +
1385 + Fixed inaccuracy in calculation of diffuse transmission in the presence
1386 + of pure specular (Fresnel reflection) using "trans" material.  Thanks
1387 + to Christoph Reinhart for pointing out the error.
1388 +
1389 + Made internal change to tone-mapping library to use structure pointer
1390 + rather than stack, making code re-entrant and more up to modern standards.
1391 +
1392 + Added -pd option to handle depth-of-field blur in rpict.  This requires
1393 + that the view directon (-vd option) include focal distance information,
1394 + which is now preserved by the various view file routines, and reported
1395 + by the vwright command.
1396 +
1397 + Added DBLUR variable to ranimate and pmdblur script to handle simultaneous
1398 + motion and depth-of-field blurring.  Thanks to Visarc for funding this work.
1399 +
1400 + Added setting of focus distance in rvu ("focus" command) and rholo
1401 + ('f'/"frame" command).
1402 +
1403 + Changed default remote shell in ranimate to "ssh" rather than "rsh",
1404 + which has been abandoned on most Unix systems due to security issues.
1405 +
1406 + Fixed behavior of source primitive using illum with no alternate
1407 + material.  These now become transparent so one can see the sky or
1408 + light-probe background for use in image-based lighting.  Previously,
1409 + the user needed to specify the background glow as the alternate
1410 + material for a distant illum source to behave properly.  (This still
1411 + works.)
1412 +
1413 + Fixed some minor problems and inconsistencies with 16-bit/channel
1414 + TIFF i/o in ra_tiff.
1415 +
1416 + Created mksource program to generate distant sources for improved
1417 + image-based lighting with light probes.
1418 +
1419 + Changed ambient calculation so that -ad will not limit recursion
1420 + depth, and a minimum of 27 samples will be sent out for each stored
1421 + ambient value, or 3 samples if -aa is 0 (caching off).
1422 +
1423 + Added -oM option to rtrace to report material (rather than modifier)
1424 + for cases where actual material is aliased or further up modifier chain.
1425 +
1426 + Rearranged the way ray contributions are computed so that it might be
1427 + possible to use rtrace to derive daylight coefficients and optical
1428 + transfer functions.  The new -oTW option of rtrace produces color
1429 + contribution weights for each ray, which combined with the -ti (or -tI)
1430 + option permits the contribution of selected surfaces or sources to
1431 + be determined.  Using the -oTW option, one should also specify
1432 + options "-dt 0 -aa 0 -as 0" for optimal results.  In particular,
1433 + one cannot expect reasonable tallies with -ab >= 1 and irradiance
1434 + caching on (-aa > 0).
1435 +
1436 + The same code modifications included a change to the indirect computation
1437 + with caching switched off (-aa 0).  Whereas before, the number of secondary
1438 + rays after the first bounce were half of the previous generation, they are
1439 + now determined by the surface reflectance, making for a better and faster
1440 + calculation.  It should now be possible to compute many bounces with -aa 0,
1441 + which used to be prohibitively expensive.
1442 +
1443 + Added -T option to xshowtrace to trace rays to light sources.
1444 +
1445 + Added meta2bmp program to produce BMP files from metafile graphics.
1446 +
1447 + Added cct_x(t) and cct_y(t) to src/cal/cal/blackbody.cal to interpolate
1448 + CIE chromaticities for particular black-body temperatures.
1449 +
1450 + Increased maximum number of input pictures in pcomb and pcompos to 512.
1451 +
1452 + Created rtcontrib program for computing ray contribution coefficients.
1453 + This tool may be used to do standard optical ray tracing or daylight
1454 + coefficient calculations for annual simulations, among other uses.
1455 +
1456 + Added tilde ('~') output option as part of the -o* specification of
1457 + rtrace.  This permits ray trees to be parsed more easily in binary
1458 + output mode, as needed by rtcontrib.
1459 +
1460 + Implemented Russian roulette ray termination with -lr <= 0.
1461 + Made -lr -10 the default in rtcontrib.
1462 +
1463 + Made rtcontrib -f option search RAYPATH directories.
1464 +
1465 + Made it so -o option of rtcontrib can pipe -o output to a command.
1466 +
1467 + Added -if and -of options to total for binary i/o (following rcalc mold).
1468 +
1469 + Switched default options in rtrace to use Russian roulette.  (Rpict and rvu
1470 + still use biased ray termination.)
1471 +
1472 + Added rtcontrib -r option to recover partial output.
1473 +
1474 + Added -u rendering option for pure Monte Carlo sampling.
1475 + (Got rid of -DMC compile option, which this makes superfluous.)
1476 +
1477 + Changed -t option of rlam to accept strings as well as single characters.
1478 +
1479 + Fixed bug in rcalc with -l option where it would sometimes go into an
1480 + infinite loop.
1481 +
1482 + Fixed truly ancient bug in bounding box computation for cones, which
1483 + could (and did) cause missing segments.
1484 +
1485 + Added -z option to normtiff to output LZW-compressed files.
1486 +
1487 + Last change to total causes it to produce results when it sees an empty
1488 + line on the input.  This was not intentional, but I decided I like this
1489 + behavior so I documented it rather than changing it.
1490 +
1491 + =====================
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
1496 + minimum ray sampling weight (serious).
1497 +
1498 + Changed mksource to use 98th percentile (rather than 99th) for threshold.
1499 +
1500 + (Above changes included in 3.7.1 patch release.)
1501 +
1502 + Eliminated writing of EXPOSURE= line in ra_tiff -r when source TIFF
1503 + does not have STONITS set.
1504 +
1505 + Fixed bug in ambient calculation that caused black values for multiple
1506 + bounces in some scenes.  Thanks to Mark Stock for creating and sharing
1507 + the sophisticated test scene that demonstrated this problem.
1508 +
1509 + Fixed bug in antimatter using Russian Roulette sampling.
1510 +
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 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
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.)

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