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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.421 by greg, Sun Aug 21 16:20:42 2022 UTC vs.
Revision 1.437 by greg, Sat Dec 9 23:46:51 2023 UTC

# Line 2575 | Line 2575 | Updated official copyright and license according to ne
2575   provided by Jean Haemmerle at the LBNL Intellectual Property Office.
2576   Both were copied verbatim from e-mail I received from Taoning Wang
2577   on 8/20/2022.
2578 +
2579 + Added -features option to rpict, rtrace, and rcontrib to check
2580 + which features are present or look for specific feature support.
2581 + This addition was suggested by Peter Apian-Bennewitz as an easier
2582 + way to determine which version of Radiance is installed and what
2583 + it supports, and is timely as we begin our refactoring of the
2584 + rendering code.  There are no current plans to add this to rvu.
2585 +
2586 + Added falsecolor -odim, -orct, and -c0 options to overlay grid of
2587 + values on image.  This was requested by Rob Shakespeare.
2588 +
2589 + Added -i* and -o* options in rhcopy for reading rays from the
2590 + standard input and writing rays from holodeck to standard output.
2591 + This will hopefully be useful in combining rholo with rcontrib.
2592 +
2593 + Added further checking for coincident (overlapping) flat surfaces,
2594 + preferring front sides to back sides in the ray intersection
2595 + calculation.  This only applies to rings and faces, as the other
2596 + surface types would have required additional calculations to
2597 + make them work.  Material transparency is still the primary
2598 + consideration, now followed by ray hit side, followed by
2599 + modifier definition order in the input.
2600 +
2601 + Increased octree and object limits to allow scenes with billions
2602 + of primitives.
2603 +
2604 + Made reciprocity averaging default to "off" in bsdf2ttree, as it seems
2605 + to create more problems than it solves.
2606 +
2607 + ====================
2608 + Version 6.0
2609 +
2610 + Extensive changes to enable spectral rendering, which defaults to "off"
2611 + to maintain backwards-compatibility with previous versions, with the
2612 + exception of the ambient file format, which is changed.  The MAXCSAMP
2613 + macro, which defaults to 24, sets the maximum number of spectral samples.
2614 + The actual number of samples is set by the "-cs" option, which defaults
2615 + to 3 for rpict, rtrace, and rcontrib.  The latter two programs support
2616 + straight spectral output, but rpict is initially restricted to
2617 + tristimulus output pictures.  New pattern primitives "spectrum",
2618 + "specfile", and "specfunc" have been added as a means to specify
2619 + spectral reflectance, emittance, etc. to materials that still have
2620 + only 3 color channels.  Those RGB channels will still affect the
2621 + spectrum if used.  Unfortunately photon-mapping is currently broken when
2622 + spectral sampling is enabled, but we will fix this as soon as possible.
2623 + Calculation overhead appears to be approximately 10-15% for RGB
2624 + renderings compared to version 5.4a.
2625 +
2626 + Added spectral rendering to rvu as well, and made -cs and -cw
2627 + options standard across the rendering library.  I also brought
2628 + mkillum, ranimove, rsensor, and mksource into the fold.  These
2629 + tools were broken in the initial release.  (Hopefully, they are
2630 + working now, but none have been tested as yet.)
2631 + There was also an indexing bug in the spectral->RGB conversions
2632 + that made reds into blues and vice versa, which has been fixed.
2633 +
2634 + Added i/o for spectral pictures to rmtxop, the first program that can
2635 + ingest them.  (Only rtrace, rcontrib, and rfluxmtx can render them.)
2636 + New symbolic rmtxop -c options, such as RGB, XYZ, S (for scotopic)
2637 + and M (for melanopic) make color conversions simpler.  Alternatively,
2638 + a reference matrix or picture may be given and the color space of
2639 + that file will be used.  The -C option takes either a symbolic
2640 + color space or reference file and is "sticky," so it applies to
2641 + all subsequent input files that do not have their own -c right ahead
2642 + of them.
2643 +
2644 + Added spectral picture support to rcrop and radcompare.
2645 +
2646 + Added new utility, rmtxcomb, which is hard to type and hard to
2647 + pronounce, and probably equally difficult to use.  Sort of a
2648 + combination of rmtxop and pcomb, it works with all the inputs and
2649 + outputs that rmtxop handles, but allows for general expressions
2650 + like those in pcomb for putting matrices together, working on
2651 + an element at a time.  (No resizing of matrices or accessing
2652 + neighboring elements, as permitted in pcomb.)  It saves memory
2653 + over rmtxop by operating on a row at a time, so can handle
2654 + input and output matrices with any number of rows.  It does
2655 + provide for a single matrix-multiplication operation at the end,
2656 + which only requires memory for that final matrix.
2657 +
2658 + Added support for filtering hyperspectral images to pfilt.
2659 +
2660 + Added support for 1- and 3-component float matrix i/o to
2661 + pcomb to allow for better interoperability.

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