started out as a pen doodle less than 1 inch wide on my notebook. 
originally pov'd it with a 3x3 grid of these with varying "phases" and 
colors, didn't really like it, so i removed the rop and bottom rows, and 
rendered it at 1200x400 (then cropped off some extra grey plane)

the only interesting parts are:

#declare n1 = normal_map {
#local n = 10;
#local cn = n;
  #while (n > 0)
   [1/cn granite 0.025 scale <1, 0.1, 0.1> rotate (360/cn * n)*z]
   #local n = n - 1;
  #end
}

#declare f1 =
finish {
  specular 1
  roughness 0.001
  phong 0.5
  phong_size 140
  diffuse 0.5
  reflection {
   0.1, 0.8 fresnel on
  }
}

#macro colored_glass_interior (theColor)
  interior {
   ior 1.65
   fade_power 1001
   fade_distance 0.08
   fade_color color theColor
  }
#end

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Attachments:
Download 'squarewave.png' (230 KB)

Preview of image 'squarewave.png'

Ross wrote:
> 
> #declare n1 = 
> 
> #declare f1 =
> 
> #macro colored_glass_interior (theColor)


which all then get used like this:

object {...
   texture {
    pigment { rgbt <1, 1, 1, 1> }
    finish {f1}
    normal {
     average
     normal_map {n1}
    }
   }

   interior { colored_glass_interior(glasscolor) }
}

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Ross <rli### [at] everestkcnet> wrote:
> #declare n1 = normal_map {
> #local n = 10;
> #local cn = n;
>   #while (n > 0)
>    [!1/cn! granite 0.025 scale <1, 0.1, 0.1> rotate (360/cn * n)*z]
>    #local n = n - 1;
>   #end
> }

I've marked a suspicious spot with exclamation marks;
you probably intend to have 1/n there?

--
jussi

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jute nous apporta ses lumieres en ce 19/08/2006 11:12:
> Ross <rli### [at] everestkcnet> wrote:
>> #declare n1 = normal_map {
>> #local n = 10;
>> #local cn = n;
>>   #while (n > 0)
>>    [!1/cn! granite 0.025 scale <1, 0.1, 0.1> rotate (360/cn * n)*z]
>>    #local n = n - 1;
>>   #end
>> }
> 
> I've marked a suspicious spot with exclamation marks;
> you probably intend to have 1/n there?
> 
> --
> jussi
> 
> 
He's using that in an average pattern. In that case, it's perfectly OK to have 
each entry share the same value there, it's a ponderation value. That way, all 
normals have the same impact.
 From the documentations:
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.

When used with pigments, the syntax is:

AVERAGED_PIGMENT:
     pigment
     {
         pigment_map
         {
             PIGMENT_MAP_ENTRY...
         }
     }
PIGMENT_MAP_ENTRY:
     [ [Weight] PIGMENT_BODY ]

Where Weight is an optional float value that defaults to 1.0 if not specified. 
This weight value is the relative weight applied to that pigment. Each 
PIGMENT_BODY is anything which can be inside a pigment{...} statement. The 
pigment keyword and {} braces need not be specified.



-- 
Alain
-------------------------------------------------
  "Having a smoking area in a restaurant is like having a peeing area in a pool."
   --Thomas Pfeffer, American Heart Association

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"jute" <nomail@nomail> wrote in message
news:web.44e72a634bbfd18cf43b014e0@news.povray.org...
> Ross <rli### [at] everestkcnet> wrote:
> > #declare n1 = normal_map {
> > #local n = 10;
> > #local cn = n;
> >   #while (n > 0)
> >    [!1/cn! granite 0.025 scale <1, 0.1, 0.1> rotate (360/cn * n)*z]
> >    #local n = n - 1;
> >   #end
> > }
>
> I've marked a suspicious spot with exclamation marks;
> you probably intend to have 1/n there?
>
> --
> jussi
>
>

yep, like alain said, i'm using this in an average later. if n=8, the normal
looks more like a cross-hatched pattern and i kind of liked it. i might
rerender it with that again.

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