The blend_modes 4 and 5 were added to the yuqk fork with a set of 
possible applications in mind. Blend mode 5, with blend_gamma settings 
larger than one, uses only the middle of the interpolation segments in a 
map. This capability can be used to define specific colors in media 
aligning in some aspect with functions or patterns.

Given the recent mention of using media to represent probabilities(a), I 
worked up an initial set of media examples related to media in general 
and 'blend_mode 5' which will ship in R13 of the yuqk fork.

Attaching an image of four results and scene files for the upper left 
and lower right sub-images.

Oh! Despite what the header says in blend_mode_5_06.pov, the attached 
version was changed to use the emission media for performance over any 
of the scattering media options.

Versions of the techniques used here can probably be implemented in 
official POV-Ray releases, but I believe much less easily, if so.

Bill P.

(a) Don't forget .df3 density files for this sort of application. Using 
multiple colors for probabilities a little problematic too given the 
differing intensities of the colors themselves - without normalization(s).

https://wiki.povray.org/content/User:Wfpokorny/DensityFile

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Attachments:
Download 'blend_mode_5_00.pov.txt' (6 KB) Download 'blend_mode_5_06.pov.txt' (8 KB) Download 'media_bldmode5.png' (260 KB)

Preview of image 'media_bldmode5.png'