In article <39d54f3b@news.povray.org>, "Tony[B]" 
<ben### [at] panamac-comnet> wrote:

> > BTW, another thing in the same interesting-but-maybe-not-useful
> > category: waveform lists for patterns. Basically, it would allow you to
> > specify a sequence of waveform transformations instead of a single
> > one...it would be implemented as just another waveform type.
> 
> ? I don't get it... please reprocess and repeat...

Ok...
Take "gradient y" for example. It makes a linear ramp-wave, the value of 
the pattern increases from 0 to 1 and then drops sharply back to 0. If 
you specify "sine_wave", this value is fed through a "filter" which 
transforms the ramp wave to a sine wave before the color_map is read.
What I am proposing is a new waveform which allows you to specify a list 
of waveform filters.

waveform_list {
    sine_wave|scallop_wave|ramp_wave|spline_wave
    add|subtract|multiply|divide|function|etc...
}

As an example:
pigment {bozo
    waveform_list {
        multiply 2
        ramp_wave
        sine_wave
        poly_wave 2
    }
    color_map {...}
}

This would make a bozo pattern with twice the frequency, and a sine wave 
falloff with sharper peaks due to the poly_wave. This isn't impossible 
to do now...but you would have to feed a bozo pattern into a function 
pattern and do the waveform stuff in the function...more flexible, but 
harder to read, less obvious and slower.

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

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