On 2025-02-10 10:47 )-4), Bald Eagle wrote:
> 
> With regard to my earlier recognition that the glory resembled the Fresnel
> diffraction pattern in shadows:  What if one used an emissive light source that
> had the ROYGBIV HSV gradient, and it cast a penumbral shadow?

How does one put a hue gradient on a light source?  Are you thinking
about a filter in front of the light source?  And how would you convert
ROYGBIV into an interference pattern?

It just occurred to me that I have played with diffraction interference:

  https://news.povray.org/55719ced%40news.povray.org

I did these images using layers of emissive media with a density
function.  For the RGB image, I stacked separate layers for red, green,
and blue respectively.  For the spectral image, I rendered an
intermediate EXR image for each of 36 wavelengths, then combined them.

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