In article <3A9051B7.EC1A5EF2@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> Some time ago (6. 1. 2001) i posted a macro for a 2d gradient pattern.  I
> now made a povray pattern calculating this in 3d based on Chris Huff's 
> type 1 displace warp code.  

What exactly does this new gradient pattern do? Is it just a pattern 
version of the displace warp?
Hmm, "grad" doesn't seem like a good keyword, but as you mentioned, 
"gradient" is already taken...and so is "slope". Maybe 
"amount_of_change_of_pigment_color_intensity". ;-)
How about "derivative"? Not as intuitive unless you already know what 
"derivative" means...and it would probably be better as a new math 
function.


> I also added a third type of displace warp similar to the second one. 
> Type 1 has an undocumented additional parameter specifying the distance
> used for calculating the gradient.  When changing this parameter, the
> amount of displacement also changes, which seems not very useful to me. 
> See the first attached picture for illustration:

I think your third type is what I intended my second type to 
be...unfortunately, I didn't heavily test the effect of the sample 
distance parameter. It shouldn't affect anything except the accuracy and 
detail of the warp.
Are you going to release the source code to your patches?

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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