"Bill Pragnell" <bil### [at] hotmailcom> wrote:

> The isosurface tutorial page mentions it:
>
> gray value = Red*29.7% + Green*58.9% + Blue*11.4%
>
> and gives a more thorough run-down on colour dot operators. Look here:
>
> http://www.povray.org/documentation/view/3.6.1/73/
>
> and scroll down to 1.3.3.3.7 - "Pigment and noise functions".
>


Thanks, didn't remember seeing it there.  The .hf operator is intriguing.
Hmm....

KW

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