Am 17.02.2013 20:57, schrieb Christian Froeschlin:

> nice design! I didn't know you could have overlapping parts
> in the prism geometry ... are these treated as "outside"?

Yup.

The algorithm behind it is actually pretty simple: To test whether point 
X is inside the prism, a line is drawn "outward"; if that line crosses 
the prism's outline an odd number of times the point is considered 
inside, otherwise it is outside.

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