fix: Added explicit edge tests to eliminate light leaks at corners

LBNL-ETA · Feb 12, 2021 · 4466f08 · 4466f08
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commit 4466f08
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diff --git a/doc/notes/ReleaseNotes b/doc/notes/ReleaseNotes
@@ -2408,3 +2408,7 @@ If the materials are both transparent or both opaque, then whichever
 surface appeared later in the scene description will be selected.
 This came of a request for consistent behavior with legal CAD output
 from Peter Apian-Bennewitz.
+
+Added explicit tests for on-edge intersections with polygons.  This should
+eliminate stray rays and tiny light leaks that often appear even in
+well-constructed geometry.