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William F Pokorny <ano### [at] anonymous org> wrote:
> Perhaps worth saying a little more than the above. Whether creating a
> height_field or internal image_map from a function in POV-Ray, any
> 'function return' values outside the [0-1] get 'wrapped' to a ramp wave
> as is the default with the majority of inbuilt patterns.
>
> So, function return values of:
> -0.1 --> 0.9
> -0.5 --> 0.5
> -0.9 --> 0.1.
> 1.1 --> 0.1
> 1.5 --> 0.5
> 1.9 --> 0.9
I will just point out that this is not currently documented anywhere.
https://wiki.povray.org/content/Reference:Maps
is blank.
If anyone wanted a quick 10-15 min project, writing a scene with a simple 0 --->
x color map and a loop, function, gradient pigment, or similar and showing that
the color_map value.x is modulo-wrapped would be great.
Numeric output via #debufg or file, or a graph showing Color.x would be nice.
- BE
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And actually, there seems to be some potentially conflicting information in the
documentation.
https://wiki.povray.org/content/Documentation:Tutorial_Section_2.2
"For every position in POV-space, a pattern returns a float value in the range
from zero to one. Values outside the zero to one range are ignored."
Presumably if a pigment pattern was wrapped in a function, one could then have
access to the actual values emitted, and either graph them or just run tests to
detect the presence of values <0 or >1.
- BE
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