Le 16/04/2020 à 04:51, Bald Eagle a écrit :
> 
> I think this is what is wanted:
> 
>
http://news.povray.org/povray.binaries.images/message/%3Cweb.5e97c744fd34edcfb0b41570%40news.povray.org%3E/#%3Cweb.5e97
> c744fd34edcfb0b41570%40news.povray.org%3E
> 

Ok, clearer with a picture, thanks.

So height on the curve is function of the distance to the prism's edge.

I foresee plenty of problems with concave prism.

It reminds me of pattern for color interpolation on polygon

http://wiki.povray.org/content/User:Le_Forgeron#Interpolation_for_polygon

> http://wiki.povray.org/content/User:Le_Forgeron#Interpolation_for_polygon

Sad point: I see no easy solver for ray computation.

Good point: defining a strength-field, using the distance to the nearest
edge of the prism, is possible. Then a non-linear function (like square
root or cube) can be used, to curve in space the shape of such isosurface.

Infernal point: the continuity of such field, when changing edge, is not
intrinsic, so excepted for regular polygon, it is probably doomed.

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