I don't know how concerned you are about error message text, but you might
like to know that this code

sphere_sweep {
    cubic_spline   // or b_spline
    2,                  // minimum for cubic_ and b_ is 4 -- here's the
error
    <0,0,0>, 2
    <1,1,1>, 0.5
}

gives the error "Attempt to malloc zero size file block", which isn't real
helpful.  Maybe something about "Incorrect number of spline points", or
somesuch, if the error-trapping code can distinguish it.  It isn't a big
deal, since it didn't cause POV to crash or anything.

Btw, I've enjoyed playing around with 3.5... the ability to enter command
line switches without calling up a dialog box is nice!

- Kevin R.

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