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

>      texture{
>          pigment{ color rgb<1,1,1>}
>          finish { emission <0.1,0,0> phong 0.5}  // <--- Here, emission
>      }

Ah.  I'll have to play with that method a bit.
When I get home, I usually have all manner of things to attend to (or neglect ;)
) and I don't have the energy/creativity level to fully conceive of
experimenting in certain ways.

I also had some difficulty getting the rich, saturated colors that they show in
Fig 10:
https://www.sciencedirect.com/science/article/pii/S0898122114005252#f000030

I tried using the normal map method developed here:

https://news.povray.org/povray.binaries.images/message/%3Cweb.5da7f3c944e99bc863814b380%40news.povray.org%3E/#%3Cweb.5d
a7f3c944e99bc863814b380%40news.povray.org%3E

But everything was pretty washed out.

They might be using a completely different method / pattern for their coloring
function - which is interesting in itself.

- BW

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