Velocity Pass - Absolute vs. Normalized

[evanerichards]

So I've got another velocity pass question.
We're rendering out with max velocity of 1, unclamped and unfiltered.

We're compositing in Flame and it's asking if we've got an absolute or a normalized velocity pass. I don't know the answer to that questions. What does vray render out?
It also has a button that says "blue channel magnitude". This is fairly vague as well. I can find nothing about it in the flame manuals. Any idea what that would be about?

Thanks!

[vlado]

I'm guessing here (never seen a Flame in my life), but I think it should be "absolute" pass.

Normally V-Ray puts zeroes in the blue channel ("ignore z" attribute in the velocity render element), so I don't think it matters for the second question.

Best regards,
Vlado