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

Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.389 by greg, Sat Mar 27 17:50:18 2021 UTC vs.
Revision 1.434 by greg, Sat Dec 2 00:42:21 2023 UTC

+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.
-+
-+
+Added support for depth-of-field blurring in vwrays using -pd option.
-+
+Also, made -c count work with vwrays -i, producing multiple samples
-+
+per indicated pixel position.  At the same time, support for the -pd
-+
+option was added to rtpict, which calls on vwrays for its samples.
-+
-+
+Fixed issue with BSDFs that didn't obey reciprocity, where direct
-+
+sampling wasn't following exactly with indirect sampling.  This was
-+
+discovered and reported by Jon Sargent.
-+
-+
+Created checkBSDF tool to test XML BSDF reciprocity and perform similar
-+
+sanity checks.
-+
-+
+Added -O option to pvalue and pextrem to report watts/sr/m^2 even if
-+
+picture is XYZE.
-+
-+
+Made subtle changes to header i/o routines to preserve alignment in
-+
+binary file formats to enable memory-mapping.  Implemented memory-mapped
-+
+matrix loading in rmtxop for binary double files.
-+
-+
+Removed ambient value sorting, which was written when ambient caches
-+
+could overwhelm available memory.  This is rarely the case these days,
-+
+and the added code complexity and updating of cache values with LRU
-+
+counts dirties pages that would otherwise remain clean, so it was
-+
+often a loss even when VM was an issue.
-+
-+
+Added iso2klems script to compute a Klems BSDF based on specular
-+
+and diffuse measurements as a function of incident angle.
-+
-+
+Fixed issue with over-counting diffuse component during aBSDF
-+
+peak extraction.
-+
-+
+Added dctimestep -x and -y options to specify image dimensions
-+
+for multiple outputs corresponding to result vectors.
-+
-+
+Added -P option to rcalc to pass formatted input when cond is <= 0.
-+
-+
+Created rcrop utility for cropping matrices and pictures more
-+
+conveniently, correcting view information.  Expect it to be handy
-+
+for extracting rows and columns from matrices, mostly.
-+
-+
+Changed pcomb so -o option elides original exposure values
-+
+from indented source headers.
-+
-+
+Added getinfo -r option, which is similar to -a except it will
-+
+replace indicated lines with new ones.
-+
-+
+Slight change to vwrays -d option to not spit out "-ld-", and to
-+
+produce "-ld+" without requiring input picture as argument.
-+
-+
+Added automatic overture calculation to rtpict with -n > 1 if
-+
+ambient cache is on and file is named.  If straight image output
-+
+is requested, we randomize all samples and avoid cache collisions.
-+
-+
+Added cnt -s option to shuffle output.
-+
-+
+Fixed issue with divide-by-zero errors in the ambient super-sampling
-+
+routine discovered by Jon Sargent of Solemma.  This affected regions
-+
+that had zero radiance, such as black backgrounds or unlit areas
-+
+with -av 0 0 0, when super-sampling was effectively disabled, causing
-+
+some loss in accuracy of the results.
-+
-+
+Updated Klems Half- and Quarter-bases to match angles currently used
-+
+in WINDOW.
-+
-+
+Eliminated most aiming failures for triangular light sources, at the
-+
+expense of conservative sampling near the centroid.  Thanks to
-+
+David Geisler-Moroder for his help on this.
-+
-+
+Increased maximum set size to 8191 to avoid set overflow errors.
-+
-+
+Added source obstruction test to statistics being kept on which
-+
+sources were visible in adaptive shadow testing code.  Previous
-+
+behavior was likely over-estimating source contributions.
-+
-+
+Added diffuse components into maximum directional hemispherical
-+
+reported by checkBSDF, so comparing to 100% is easier for each
-+
+component.
-+
-+
+Fixed incorrect calculations in iso2klems script, thanks to
-+
+help from Jacob Jonnson.
-+
-+
+Updated official copyright and license according to new wording
-+
+provided by Jean Haemmerle at the LBNL Intellectual Property Office.
-+
+Both were copied verbatim from e-mail I received from Taoning Wang
-+
+on 8/20/2022.
-+
-+
+Added -features option to rpict, rtrace, and rcontrib to check
-+
+which features are present or look for specific feature support.
-+
+This addition was suggested by Peter Apian-Bennewitz as an easier
-+
+way to determine which version of Radiance is installed and what
-+
+it supports, and is timely as we begin our refactoring of the
-+
+rendering code.  There are no current plans to add this to rvu.
-+
-+
+Added falsecolor -odim, -orct, and -c0 options to overlay grid of
-+
+values on image.  This was requested by Rob Shakespeare.
-+
-+
+Added -i* and -o* options in rhcopy for reading rays from the
-+
+standard input and writing rays from holodeck to standard output.
-+
+This will hopefully be useful in combining rholo with rcontrib.
-+
-+
+Added further checking for coincident (overlapping) flat surfaces,
-+
+preferring front sides to back sides in the ray intersection
-+
+calculation.  This only applies to rings and faces, as the other
-+
+surface types would have required additional calculations to
-+
+make them work.  Material transparency is still the primary
-+
+consideration, now followed by ray hit side, followed by
-+
+modifier definition order in the input.
-+
-+
+Increased octree and object limits to allow scenes with billions
-+
+of primitives.
-+
-+
+Made reciprocity averaging default to "off" in bsdf2ttree, as it seems
-+
+to create more problems than it solves.
-+
-+
+====================
-+
+Version 6.0
-+
-+
+Extensive changes to enable spectral rendering, which defaults to "off"
-+
+to maintain backwards-compatibility with previous versions, with the
-+
+exception of the ambient file format, which is changed.  The MAXCSAMP
-+
+macro, which defaults to 24, sets the maximum number of spectral samples.
-+
+The actual number of samples is set by the "-cs" option, which defaults
-+
+to 3 for rpict, rtrace, and rcontrib.  The latter two programs support
-+
+straight spectral output, but rpict is initially restricted to
-+
+tristimulus output pictures.  New pattern primitives "spectrum",
-+
+"specfile", and "specfunc" have been added as a means to specify
-+
+spectral reflectance, emittance, etc. to materials that still have
-+
+only 3 color channels.  Those RGB channels will still affect the
-+
+spectrum if used.  Unfortunately photon-mapping is currently broken when
-+
+spectral sampling is enabled, but we will fix this as soon as possible.
-+
+Calculation overhead appears to be approximately 10-15% for RGB
-+
+renderings compared to version 5.4a.
-+
-+
+Added spectral rendering to rvu as well, and made -cs and -cw
-+
+options standard across the rendering library.  I also brought
-+
+mkillum, ranimove, rsensor, and mksource into the fold.  These
-+
+tools were broken in the initial release.  (Hopefully, they are
-+
+working now, but none have been tested as yet.)
-+
+There was also an indexing bug in the spectral->RGB conversions
-+
+that made reds into blues and vice versa, which has been fixed.
-+
-+
+Added i/o for spectral pictures to rmtxop, the first program that can
-+
+ingest them.  (Only rtrace, rcontrib, and rfluxmtx can render them.)
-+
+New symbolic rmtxop -c options, such as RGB, XYZ, S (for scotopic)
-+
+and M (for melanopic) make color conversions simpler.  Alternatively,
-+
+a reference matrix or picture may be given and the color space of
-+
+that file will be used.  The -C option takes either a symbolic
-+
+color space or reference file and is "sticky," so it applies to
-+
+all subsequent input files that do not have their own -c right ahead
-+
+of them.
-+
-+
+Added spectral picture support to rcrop and radcompare.

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Comparing ray/doc/notes/ReleaseNotes (file contents): Revision 1.389 by greg, Sat Mar 27 17:50:18 2021 UTC vs. Revision 1.434 by greg, Sat Dec 2 00:42:21 2023 UTC

Diff Legend

Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.389 by greg, Sat Mar 27 17:50:18 2021 UTC vs.
Revision 1.434 by greg, Sat Dec 2 00:42:21 2023 UTC