OK, thanks a lot guys (Roland and Peter), I got it to work! :-)

At least as far as I expected it to do. Another problem is that
occationally (when Nx or Nz change from positive to negative,
it seems), the "tube" will twist itself 180 degrees, leaving a
segment that (remotely) resembles an hourglass.. :-/

The strange thing is, if I draw the curve in the Y window (i.e. all
points on the curve have Y=0) no twisting occurs.. Hrm...

Vidar

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