Ended up going absolute.
I found a set of parameters that matches the leading edge nicely. The rest of the primary veins are completely off, though. How can I accommodate both in the same equation?
Right now the equation is something like this:
dir = root_quadratic * index^2 + root_linear * index + root_const
+ seg_quadratic * generation^2 + seg_linear * generation
Do I need to have terms that include both the primary vein index and the segment generation?
a * index^2 * generation^2 + b * index^2 * generation
+ c * index * generation^2 + d * index * generation
Also note that while the values for the quadratic components all display “0.00” that’s just because of rounding. I am using non-zero values for those so they’re not just a waste of time.