On 2/26/25 18:08, Bald Eagle wrote:
> The colors that you get are therefore sort of reversed from a regular rainbow.
> 
> Image_map attached.

Thanks, Bill, for posting the image_map image with the colors.

Attached is an image where the light source was moved behind the plane 
with the wrinkles pattern clouds. I used the outer most of the six, 
color, isosurface dust, rings as the projected through shape. The light 
rays magically pop through the blocking plane and shoot out of a 
gazillion dust particles on the other side!

It is slow. Right at two hours on my old Intel i3 CPU. It's not all due 
scattering media; My leaving the plane's pigment as a wrinkles pattern 
was costly. A stored image mapped to the plane would be faster.

More work would be needed to make it look somewhat realistic to any 
given real world phenomenon. The image is generated 'looking the wrong 
way', for example, but the method has potential for faking effects like 
Glories I think.

Bill P.

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Attachments:
Download 'try01.jpg' (54 KB)

Preview of image 'try01.jpg'