On 3/22/21 7:27 AM, William F Pokorny wrote:

> The short answer if you are using v3.7 or v3.8 more or less stock, is 
> you can use the 0-1 map range only(1).

That's what I thought.
Any chances on future alternate mechanism for color/pattern/texture 
mapping in POV-Ray or povr?

> (1) - And even with this there are some general issues/bugs.

I hadn't known.  :O

> For more information look at the series of postings working backward 
> from to the first few starting here:
> 
>
http://news.povray.org/povray.beta-test.binaries/thread/%3C5fdfc14f%40news.povray.org%3E/


No idea what you're directing me to.  But I will make do with 0-1.

Could I fake/simulate a wider range using an attenuated function output 
coupled with a color map ranging from negative color values to color 
values above 1?

Do you know where the "color math" happens in source?   I'm wondering if 
it's as simple as summing the rgb values.
Does <-n, 1, 1> = <0, 1-n, 1-n>?

And how do HDRI ... things ... get encoded?

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