If two cylinders are joined at a right angle and unioned togeter with
exactly their overlapping portions subtracted with boxes, you end up
with visual artifacts in the rendering. There are two primary
artifacts evident, the first being that the boolean evaluation of both
cylinder ends appears to slice a very small portion out of the
cylinder edge where the other cylinder numerically matches it. That
is, where the flat cylinder top is tangent to the other cylinder's
curved side surface. The second artifact appears to be a speckling
rim where the cylinder surfaces meet along a curved survace line.
This results in a dark speckled line that is probably due to incorrect
Both problems are probably due to floating point errors in the
boolean segment calculations. Attached should be an example
geometry database and a saved view that easily exhibits the
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