Ok, here's my problem right now:

My tree and branches are made by following along a spline, placing vertices at a
specified radius in a circle around the spline.  In order for the branches to
have a consistent radius, I need the plane on which each circle of vertices
rests to be perpendicular to the the direction of the spline.

I thought that would be simple enough, but I'm having trouble.  I've been trying
to use vcross() to get an perpendicular axis to rotate a vector around, but
every time the spline changes direction, the axis will flip and therefore so
does the order of my vertices.  The result is an effect similar to twisting a
tube balloon.

Am I making any sense?  Any help?  Any simple solution that I'm just not seeing?

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