In article <kl7ROA8DViqumXDDshn3p=K2ut20@4ax.com>, Peter Popov 
<pet### [at] usanet> wrote:

> On Thu, 16 Mar 2000 07:10:57 -0500, Chris Huff
> <chr### [at] yahoocom> wrote:
> 
> >How about a new pigment_map type, "additive", which holds multiple 
> >pigments and adds up their results, with a syntax similar to "average".
> >You could use one pigment for the red, another for the green, and a 
> >third for the blue, etc.
> 
> You mean like using a function pigment?

No, like using an average pigment.

4.7.7.2  Average

Technically average  is not a pattern type but it is listed here 
because the syntax is similar to other patterns. Typically a pattern 
type specifies how colors or normals are chosen from a pigment_map ? 
texture_map , density_map , or normal_map , however average  tells 
POV-Ray to average together all of the patterns you specify.  Average 
was originally designed to be used in a normal statement with a 
normal_map  as a method of specifying more than one normal pattern on 
the same surface. However average may be used in a pigment statement 
with a pigment_map  or in a texture statement with a texture_map  or 
media density with density_map  to average colors too.

...
For example
  pigment {
    average
    pigment_map {
      [1.0  Pigment_1]
      [2.0  Pigment_2]
      [0.5  Pigment_3]
    }
  }

An "additive" pattern would add the colors/densities/normals/whatever 
together instead of averaging them together. You could subtract a 
"channel" by using negative numbers for it. Maybe "multiplicative" would 
also be good.

It would also be nice to be able to specify the way they are combined by 
using an isosurface function, but I don't know how this would be 
specified with the current syntax or how difficult it would be to 
implement.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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