Hi OSTexo,
> It sounds like the answer to the relationship is different depending on what points you choose to
> evaluate on each inner and outer curve pair.
Yeah I suppose so. I guess you might want to define your comparison points by some kind of geometric searching function, like "the closest point to the other curve from this given point on the first curve".
Maybe an equation using that kind of geometric point to point solving function between 2 objects is more along the lines of what you're looking for. But there is nothing built into the inherent NURBS properties of curves individually that would give you an equation like that, you would need to do some pretty sophisticated reverse engineering process that involved doing going through the curve, running the point to point solving function to get a comparison point on the other curve and making note of how that distance changes as you move across the curve. But unless you already have some idea of what kind of relationship you're looking for it's not really very approachable to just say "find any equation that produces this point matching set".
- Michael
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