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On Thu, 16 Sep 1999 22:13:29 -0500, "John M. Dlugosz"
<joh### [at] dlugosz com> wrote:
>If I use a scale instead of frequency, I get the desired effect.
>The docs say that the effects should be identical.
>
>What's up?
You're misreading the docs.
| The frequency keyword adjusts the number of times that a color map
| repeats over one cycle of a pattern. For example gradient covers color
| map values 0 to 1 over the range from x=0 to x=1. By adding frequency
| 2.0 the color map repeats twice over that same range.
The pattern doesn't change. Just the color map does. So saying
color_map {[0 rgb 0][1 rgb 1]} frequency 2.0
is like saying
color_map {[0 rgb 0][1/2 rgb 1][1/2 rgb 0][1 rgb 1]}
but saying
color_map {[0 rgb 0][1 rgb 1]} frequency 1.5
is like saying
color_map {[0 rgb 0][2/3 rgb 1][2/3 rgb 0][4/3 rgb 1]}
except that that isn't legal. So POV truncates the color
map at 1.
You're probably referring to this sentence:
| The same effect can be achieved using scale 0.5*x so the frequency keyword
| isn't that useful for patterns like gradient.
The problem is, that sentence isn't definitive. It just points out
that the results of THAT SPECIFIC OPERATION are identical to a scale.
Noninteger frequencies are not identical to a scale.
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