Structure SynthとSunflowで夕暮れ後のような色合いの画像をレンダリングする

Structure SynthとSunflowで夕暮れ後のような色合いの画像をレンダリングするには、以下のテンプレートのように、shaderをdiffuseに変更してgiの光の色を変更します。
テンプレートファイルは、Structure SynthのMiscディレクトリ以下に起きます。

<template defaultExtension="Sunflow scene file (*.sc)" name="Sunflow" runAfter="%SUNFLOW%\sunflow.bat "$FILE" -o "$FILE.png"" >
<description>
this template uses diffuse shader.

Original template by Syntopia.  
The Sunflow coloring was added by Tom Beddard ('subblue')
</description>
<primitive name="begin" ><![CDATA[
%photons {
%  caustics 10000000 kd 64 0.5
%}

%% common settings
image {
  resolution {width} {height}
 aa 0 2
}

gi {
  type ambocc
%   bright { "sRGB nonlinear" 1 1 1 }
  bright { "sRGB nonlinear" 0.6 0.7 1 }
  dark { "sRGB nonlinear" 0 0 0 }
  samples 64
  maxdist 3.0
}

accel bih
filter mitchell
bucket 32 spiral

%% camera
camera {
  type pinhole
  eye    {CamPosX} {CamPosY} {CamPosZ}
  target {CamTargetX} {CamTargetY} {CamTargetZ}
  up     {CamUpX} {CamUpY} {CamUpZ}
  fov    {fov}
  aspect {aspect}
}


%% scene background - comment out if not needed
background {
%   color  { "sRGB nonlinear" {BR} {BG} {BB} }
  color  { "sRGB nonlinear" 0.5 0.6 0.8 }
}


%% geometry
object {
  shader none
  transform col 0.001 0 0 0  0 0.001 0 0  0 0 0.001 0  0 0 0 1
  type generic-mesh
  name "Box"
  points 8
      1  1  1
      1  0  1
      0  0  1
      0  1  1
      0  1  0
      0  0  0
      1  0  0
      1  1  0

  triangles 12
     0 3 2
     0 2 1
     2 3 4
     2 4 5
     3 0 7
     3 7 4
     0 1 6
     0 6 7
     1 2 5
     1 5 6
     5 4 7
     5 7 6
  normals none
  uvs none
}
  ]]></primitive>
<primitive name="end" ><![CDATA[

  ]]></primitive>
<primitive name="box" ><![CDATA[
shader {
 name "shader{uid}"
   type diffuse
 diff { "sRGB nonlinear" {r} {g} {b} }
}

instance {
 name "{uid}"
 geometry "Box"
 transform col {matrix}
 shader "shader{uid}"
}
  ]]></primitive>
<primitive name="sphere" ><![CDATA[
shader {
 name "shader{uid}"
 type diffuse
 diff { "sRGB nonlinear" {r} {g} {b} }
}

object {
 shader "shader{uid}"
 type sphere
 c {cx} {cy} {cz}
 r {rad}
}
  ]]></primitive>
</template>

Sunflowでの出力画像