Reactor wrote:
> Also, isn't that the first derivative (i.e. slope), not the second?  The
> function is roughly analogous to what you would want to do with, say, the
> surface normal of the object (i.e. measure the normal's rate of change), or the
> values that are returned from the slope pattern.
> 
> If you use this directly as a pigment, you should clip it between 0 and 1.
> Personally, I would also probably rotate the image and evaluate in the xz plane
> because it is easier for me to think of, but either way will work.
> 
> 
> -Reactor


There are unfortunately some weird striations in the resulting image:

http://i421.photobucket.com/albums/pp292/SharkD2161/Support/hf_striations.png

At least I can *see* something. :)

-Mike

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