Has anyone connected the magnitude of acceleration to a Mantra shader?

Here is an example of the look I want for the greyscale shader I would like to create (example on the left):

http://drawnline.net/abyss/shotbreakdown.html [drawnline.net]

Importantly (aside from calculating acceleration from velocity) I would just like to know how I can take an animated geometry's point attribute and use its velocity to drive the color of a shader.

In Vop's create a “Parameter” vop, set the type and name to be the same same as the geometry attribute.

cheers
S

This may do what you want.

You may want to normalize the acceleration vector. In that case you get constant luminosity and only shifting hues according to the acceleration components.