Hi folks,

yet another new version to test:

https://github.com/POV-Ray/povray/releases/tag/v3.7.1-alpha.8889454

This version adds a new pigment pattern:

    pigment {
      user_defined {
        function { RED_FUNCTION },
        function { GREEN_FUNCTION },
        function { BLUE_FUNCTION },
        function { FILTER_FUNCTION },
        function { TRANSMIT_FUNCTION }
      }
    }

Each function is optional, in which case the corresponding component is
set to 0. For example, the following sets the colour to rgbft <x,y,0,0,z>:

    pigment {
      user_defined {
        function { x },
        function { y },
        ,,
        function { z }
      }
    }


Aside from that, the version also includes the data container update as
well as the transmission-based highlights/reflections knockout update.

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