Integrator "volpath" "integer maxdepth" [100]

Sampler "sobol" "integer pixelsamples" [1024]

Film "rgb" 
  "integer xresolution" [1280]
  "integer yresolution" [720]
  "string filename" "disney-cloud-720p.exr"
  #"integer xresolution" [1998]
  #"integer yresolution" [1080]
  #"string filename" "disney-cloud-hd.exr"

#Reverse X axis.
Scale -1 1 1
LookAt
  #Eye
  648.064 -82.473 -63.856
  #Target
  6.021 100.043 -43.679
  #Up vector
  0.273 0.962 -0.009
#Converting fov according to the height/width ratio: 31.07 = 360/(2*PI) * 2*arctan(180/333*tan(54.43 * PI/360)).
Camera "perspective" "float fov" [31.07]


WorldBegin

#Uniform illumination from all directions.
LightSource "infinite" "rgb L" [0.03 0.07 0.23]

#Approximate the sun.
LightSource "distant"
  "point3 to" [-0.5826 -0.7660 -0.2717]
  "rgb L" [2.6 2.5 2.3]

AttributeBegin
  Translate 0 -1000 0
  Scale 2000 2000 2000
  Rotate -90 1 0 0
  Material "diffuse" "spectrum reflectance" [200 0.2 900 0.2]
  Shape "disk"  
AttributeEnd

AttributeBegin
  MakeNamedMedium "cloud" "string type" "nanovdb" 
    "string filename" "wdas_cloud_quarter.nvdb"
    "spectrum sigma_a" [200 0 900 0]
    "spectrum sigma_s" [200 1 900 1]
    "float g" [0.877]
    "float scale" [4]
  
  AttributeBegin
    Translate -9.984 73.008 -42.64
    Scale 206.544 140.4 254.592
    Material "interface"
    MediumInterface "cloud" ""
      #Bounding sphere of a unit cube (of diameter equal to the cubic root of 3).
      Shape "sphere" "float radius" [1.44224957031]
  AttributeEnd
AttributeEnd