"And" <49341109@ntnu.edu.tw> wrote:
> 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)
>

Too dark is caused by lacking of multiple scattering, so I fill-in some light
with emission for it.



    material{
        texture{
            pigment{rgbt<0,0,0,1>}
            finish{ambient 0 diffuse 0}
        }
        interior {

            media{
                samples 8

               emission rgb<3.73, 2.92*0.75*0.161, 2.78*0.65*0.01 >*0.15

                density {
                dens_cloud2
                }
            }
            media{
                samples 8
                emission rgb<1.00, 0.784*0.75*0.161, 0.746*0.65*0.01 >*1.0
                         // notice this is
                         // vdot(<1.00, 0.784*0.75, 0.746*0.65>,
                         //      <1.00, 0.161, 0.01>)
                         //      ^^^^^^^^^^^^^^^^^^^  this is my sun color

                scattering{
                3, rgb< 1.00, 0.784, 0.746 >*8.0 //this is the same, not change
                extinction 0.8
                }
                density {
                dens_cloud
                }
            }
        }
    }


for the sunset I use rgb<1.00,0.161,0.01>*strength for my parallel light as sun
light. It is from a sunset photo, I measured the color.

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