I just added a custom bounding box to a CSG union of mine. The union was a
few large, flat, rectangular boxes, piled on top of each other, each one
smaller than the one below it (it's supposed to be a platform with steps
going up to it from all sides). I bound it with one single box as wide as
the bottom step, and as tall as the top step. POV-Ray came up with a
message: "Parse warning: CSG union unnecessarily bounded". Nevertheless,
from two different camera views, I got a noticably faster render (9 seconds
faster at 2 min. 24 sec., and 10 seconds faster at 1 min. 36. sec. from a
different view). Is this a mistake by POV-Ray (3.6.1c) or are the speed
differences just coincidental? (I tried to the keep the computer doing
nothing else on my test renders.) What bounding box was used before I added
mine?

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