When shooting a ray along the surface of a BOT which has stair step type
features, the first step may or may not be processed correctly, depending
on alignment. The riser to the next step (i.e., vertical section) incorrectly
acts as an exit when in fact the ray is leaving the first surface encountered
and entering the riser section.
A fictitious exit appears when the first concave corner is struck.
An example test case illustrating this problem is available from brlcad.
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