William F Pokorny <ano### [at] anonymousorg> wrote:

> Yes. I removed the .hf option in povr at some point. In part because it
> was an undocumented feature.

Not where it should be: 2.3.3.3.7 Noise and pigment functions

quote:

And two special purpose operators, their supported dot types to access these
operators are:

Note: The .hf operator is experimental and will generate a warning.
1.fn_Pigm( ).gray to get the gray value of the color vector
gray value = Red*29.7% + Green*58.9% + Blue*11.4%
2.fn_Pigm( ).hf to get the height_field value of the color vector
hf value = (Red + Green/255)*0.996093



ingo

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