By the way, the automatic closing of the prism works fine if you replace
this line:
#if (pointarray[dim-1].u != pointarray[0].u & pointarray[dim-1].v !=
pointarray[0].v)
with this:
#if ((pointarray[dim-1].u != pointarray[0].u) | (pointarray[dim-1].v !=
pointarray[0].v))
Rune
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