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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.60 by greg, Wed Jan 5 19:34:10 2005 UTC vs.
Revision 1.82 by greg, Mon Jun 13 20:07:56 2005 UTC

# Line 1385 | Line 1385 | mixing meshes and instances.  (Thanks to Jack de Valpi
1385   Fixed innacuracy 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 -R rendering option for pure Monte Carlo sampling.
1475 + (Got rid of -DMC compile option, whicht his makes superfluous.)

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