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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.382 by greg, Sun Jan 31 18:08:04 2021 UTC vs.
Revision 1.392 by greg, Fri Apr 9 01:48:20 2021 UTC

# Line 2408 | Line 2408 | If the materials are both transparent or both opaque,
2408   surface appeared later in the scene description will be selected.
2409   This came of a request for consistent behavior with legal CAD output
2410   from Peter Apian-Bennewitz.
2411 +
2412 + Added explicit tests for on-edge intersections with polygons.  This should
2413 + eliminate stray rays and tiny light leaks that often appear even in
2414 + well-constructed geometry.
2415 +
2416 + Added "-s up" option to pabopto2bsdf to allow for 180 degree symmetry,
2417 + meaning that data repeats after 180 degree rotation (as distinguished
2418 + from "-s bilateral" whose data is mirrored about a vertical plane).
2419 + Thanks to Helen Rose Wilson for the suggestion and informing me that
2420 + such a thing exists.
2421 +
2422 + Removed upper limit on number of modifiers in rcontrib.
2423 +
2424 + Put cap on maximum ambient gradient to avoid over-extrapolation of
2425 + poorly computed irradiance cache values.
2426 +
2427 + Added robjutil +T option to triangulate all faces in .OBJ description.
2428 +
2429 + Altered BSDF library to have both front and back diffuse transmittance
2430 + values, which can be different.  This was necessary to avoid issues
2431 + caused by measurement and modeling discrepancies.
2432 +
2433 + Added pabopto2bsdf -g option to cull near-grazing scattering to avoid
2434 + issues with noise and negative values.
2435 +
2436 + Increased default dynamic range from 32 to 100 in pcond and normtiff.
2437 +
2438 + Added -o and -n options to genbox to create .OBJ output and segment
2439 + edges and corners for transparent materials.

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