On 2019-07-12 4:45 PM (-4), Jörg "Yadgar" Bleimann wrote:
> 
> The original look of this image is possibly no more reconstructable, as 
> the script was originally written for MegaPOV 0.6; however, thanks to 
> Jerôme Grimbert's advice, I replaced the original disp_nelems by 
> dispersion_samples to render it with POV-Ray 3.7!

Which is fine with me, because IMO POV-Ray 3.7.0.0 was the very first 
version of POV-Ray to do an acceptable job at dispersion.  (Thank you, 
clipka.)

(POV 3.6.*, and presumably all earlier versions, did not compensate for 
the reduced luminosity at the edges of the visual spectrum, leading to 
darkened objects; and POV 3.5 had a terrible problem with spurious cyan 
artifacts when Fresnel reflection was used.)

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