Sunset:

this image I just assigned scattering media for the cloud. You can see the cloud
is too dark.
Even I set the extinction smaller than 1.0(this is equal emission some lights)


// cloud
box{
<-5.01, -5.01, 0>, <5.01, 5.01, 1>
hollow
    material{
        texture{
            pigment{rgbt<0,0,0,1>}
            finish{ambient 0 diffuse 0}
        }
        interior {
            media{
                samples 8

                scattering{
                3, rgb< 1.00, 0.784, 0.746 >*8.0 //8.0
                extinction 0.8
                }
                density {
                dens_cloud
                }
            }
        }
    }
scale 2
translate <0,0,0.4>
}

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Attachments:
Download 'mountain scene2 1 sunset only scattering.png' (164 KB)

Preview of image 'mountain scene2 1 sunset only scattering.png'