| 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. | 
| 2411 | + |  | 
| 2412 | + | Added explicit tests for on-edge intersections with polygons.  This should | 
| 2413 | + | eliminate stray rays and tiny light leaks that often appear even in | 
| 2414 | + | well-constructed geometry. | 
| 2415 | + |  | 
| 2416 | + | Added "-s up" option to pabopto2bsdf to allow for 180 degree symmetry, | 
| 2417 | + | meaning that data repeats after 180 degree rotation (as distinguished | 
| 2418 | + | from "-s bilateral" that is mirrored about a vertical plane).  Thanks | 
| 2419 | + | to Helen Rose for the suggestion and informing me that such a thing exists. |