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Comparing ray/doc/notes/ReleaseNotes (file contents):
Revision 1.381 by greg, Tue Jan 19 23:32:00 2021 UTC vs.
Revision 1.382 by greg, Sun Jan 31 18:08:04 2021 UTC

# Line 2400 | Line 2400 | and rcollate.
2400  
2401   Added -rf and -rb options to rmtxop to load front or back reflectance
2402   matrix data from XML file rather than transmission.  (Lars Grobe suggested.)
2403 +
2404 + Improved behavior for coincident surfaces with different materials.
2405 + Rather than returning one surface or the other based on floating-point
2406 + vagaries, opaque materials are now preferred over transparent ones.
2407 + If the materials are both transparent or both opaque, then whichever
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.

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