Strand length on the rendertree

[Fabricio Chamon]

Hi guys,

is it possible to access the absolute strand length value (in SI units or
whatever) on the rendertree ? I'm trying to gradient shade a hair, and I
need strands to pick a value from the gradient based on their actual length
(strand with length=1 goes from black to white, strand with length=0.5 goes
from black to grey)

Not using ICE, so I have to calculate at render time.

thanks