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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.479 by greg, Thu Mar 27 01:26:55 2025 UTC vs.
Revision 1.482 by greg, Thu Apr 10 23:30:58 2025 UTC

# Line 2780 | Line 2780 | Wrote new pvsum tool to handle cases dctimestep can't,
2780   spectral input pictures.  It also adds a -N option for multi-
2781   processing on Unix machines, which utilizes memory-mapped
2782   inputs for efficient i/o sharing.
2783 +
2784 + Made it so genBSDF can use spectral rendering for a
2785 + more accurate photometric result.
2786 +
2787 + Changed default matrix representation to float rather than
2788 + double, which uses less RAM and supports faster operations
2789 + in general.  Build with compiler flag:
2790 +        -DDTnativeDTrmx_native=DTdouble
2791 + to get back higher precision representation.
2792 +
2793 + Taoning Wang updated genssky and gensdaymtx to provide illuminance
2794 + calibration and accept EPW files directly as input.

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