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You prob already know this one but for many of us learning iso's this is
the Bible:
http://www.econym.demon.co.uk/isotut/index.htm
Can't tell you how to get a rounded iso "prism" to happen
but Mike has a lot there on sweeping shapes along splines. Maybe maybe.
I'm just not good enough with math hence iso's to say definitively.
Though I have thought of doing that myself
Beautiful picture so far!
