Declare "minmax" "integer"
Declare "Pl1" "uniform point"
Declare "Pl2" "uniform point"
Declare "Pl3" "uniform point"
Declare "Pl4" "uniform point"
Declare "maplist" "uniform string"
Declare "shadowbias" "uniform float"
Declare "gapbias" "uniform float"
Declare "numsamples" "uniform float"
Option "shadow" "bias" [0.6]

FrameBegin 1
  # First Soft Shadow Map image (upper left)
  Display "sphere1.z" "zfile" "z"
  Format 256 256 1.0
  PixelSamples 1 1
  Hider "hidden" "jitter" [0]
  Projection "perspective" "fov" 20
  Rotate -37.74 1 0 0
  Rotate 39.29 0 1 0
  Translate -9 -11 11
  WorldBegin
    TransformBegin
      Rotate -90 1 0 0
      Cylinder 2 -2 2 360
      Disk 2 2 360
    TransformEnd
  WorldEnd

  Identity

  # Second Soft Shadow Map image (upper right)
  Display "sphere2.z" "zfile" "z"
  Format 256 256 1.0
  PixelSamples 1 1
  Hider "hidden" "jitter" [0]
  Projection "perspective" "fov" 20
  Rotate -37.74 1 0 0
  Rotate 50.71 0 1 0
  Translate -11 -11 9
  WorldBegin
    TransformBegin
      Rotate -90 1 0 0
      Cylinder 2 -2 2 360
      Disk 2 2 360
    TransformEnd
  WorldEnd

  Identity

  # Third Soft Shadow Map image (lower left)
  Display "sphere3.z" "zfile" "z"
  Format 256 256 1.0
  PixelSamples 1 1
  Hider "hidden" "jitter" [0]
  Projection "perspective" "fov" 20
  Rotate -32.34 1 0 0
  Rotate 39.29 0 1 0
  Translate -9 -9 11
  WorldBegin
    TransformBegin
      Rotate -90 1 0 0
      Cylinder 2 -2 2 360
      Disk 2 2 360
    TransformEnd
  WorldEnd
  
  Identity
  
  # Fourth Soft Shadow Map image (lower right)
  Display "sphere4.z" "zfile" "z"
  Format 256 256 1.0
  PixelSamples 1 1
  Hider "hidden" "jitter" [0]
  Projection "perspective" "fov" 20
  Rotate -32.34 1 0 0
  Rotate 50.71 0 1 0
  Translate -11 -9 9
  WorldBegin
    TransformBegin
      Rotate -90 1 0 0
      Cylinder 2 -2 2 360
      Disk 2 2 360
    TransformEnd
  WorldEnd

  Identity

  MakeShadow "sphere1.z" "sphere1.shd" "minmax" [1]
  MakeShadow "sphere2.z" "sphere2.shd" "minmax" [1]
  MakeShadow "sphere3.z" "sphere3.shd" "minmax" [1]
  MakeShadow "sphere4.z" "sphere4.shd" "minmax" [1]

  Display "softshadows.tif" "file" "rgb"
  Format 640 480 1.0
  PixelSamples 2 2
  Hider "hidden" "jitter" [1]
  Projection "perspective" "fov" 16
  Translate 2 0 40
  Rotate -30 1 0 0
  WorldBegin
    LightSource "ambientlight" 1 "intensity" 0.02 "lightcolor" [1 1 1]
    LightSource "arealight" 2 "lightcolor" [1 1 1] "intensity" 1.6 "Pl1" [8 12 -12] "Pl2" [12 12 -8] "Pl3" [8 8 -12] "Pl4" [12 8 -8] "maplist" ["sphere1.shd,sphere2.shd,sphere3.shd,sphere4.shd"] "shadowbias" [0.6] "gapbias" [0.1] "numsamples" [32]
    Color [0.9 0.7 0.1]
    Surface "plastic"
    TransformBegin
      Rotate -90 1 0 0
      Cylinder 2 -2 2 360
      Disk 2 2 360
    TransformEnd
    Color [0.7 0.6 0.4]
    Patch "bilinear" "P" [-20 -2  20  20 -2  20  -20 -2 -20  20 -2 -20]
  WorldEnd
FrameEnd