Thanks!  I'll give it a try.

Jim

"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] fwicom...
> On Sat, 23 Jun 2001 13:26:16 -0400, Jim Kress wrote:
> >Thanks Ron.  Would you please point me to an example of how to nest the
> >blend maps?
>
> I would have sworn someone posted something about this here before, but
> none of my searches just now turned up anything useful, so here's a rather
> simplistic example.  Of course you could automate this whole process, and
> even put the various parts in an array to make the while-loop more
manageable.
> In this example, each part can consist of up to 255 entries, for a total
in
> the nested map of 1275 entries.  You could, of course, use up to 255 parts
> for a ridiculous number of entries.  Note that this method will slow down
> rendering, so if your scene already takes a long time to render it won't
be
> practical.
>
> #declare Part1=pigment{
>   gradient x
>   color_map{
>     [0 rgb 0]
>     // ... lots and lots of entries ...
>     [.2 red 1]
>   }
> }
> #declare Part2=pigment{
>   gradient x
>   color_map{
>     [.2 red 1]
>     // ... lots and lots of entries ...
>     [.4 red 1 green 1]
>   }
> }
> #declare Part3=pigment{
>   gradient x
>   color_map{
>     [.4 red 1 green 1]
>     // ... lots and lots of entries ...
>     [.6 green 1]
>   }
> }
> #declare Part4=pigment{
>   gradient x
>   color_map{
>     [.6 green 1]
>     // ... lots and lots of entries ...
>     [.8 blue 1]
>   }
> }
> #declare Part5=pigment{
>   gradient x
>   color_map{
>     [.8 blue 1]
>     // ... lots and lots of entries ...
>     [1 rgb 0]
>   }
> }
>
> #declare Nested=pigment{
>   gradient x
>   pigment_map{
>     [ 0 Part1][.2 Part1]
>     [.2 Part2][.4 Part2]
>     [.4 Part3][.6 Part3]
>     [.6 Part4][.8 Part4]
>     [.8 Part5][ 1 Part5]
>   }
> }
>
> --
> plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip
x}rotate
> z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red
1rotate 60
> *z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb
z}text{ttf"arial.ttf"
> "RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron
Parker

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