Following my previous attempt, I am now trying to do the same thing with a
sky_sphere with a gradient pigment in it instead of the flat "background" (maybe
I can use a gradient with background?) Anyway, It doesn't seem to behave the
same:
when I put RGBT colors with value 1 for transmit of both colors in the colormap,
it results in a non colored background what I would want is a colored gradient
from horizon to zenith but still a flat sky matte in the alpha channel...

Here is an instance of the kind of current output I am trying:

sky_sphere {
  pigment {
    grandient z //(Blender coordinates system has Z upwards)
    color_map {
      [0.0 rgbt<0.9, 0.5, 0.8, 1>]
      [1.0 rgbt<0.3, 0.9, 0.9, 1>]
    }
  }
}

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