pbrt 0.1.5

Rust implementation of https://pbrt.org/
Documentation 
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LookAt 3 4 1.5  # eye
       .5 .5 0  # look at point
       0 0 1    # up vector
Camera "perspective" "float fov" 45

Sampler "halton" "integer pixelsamples" 128
Integrator "path"
Film "image" "string filename" "simple.png"
     "integer xresolution" [400] "integer yresolution" [300]

WorldBegin

# uniform blue-ish illumination from all directions
LightSource "infinite" "rgb L" [.4 .45 .5]

# approximate the sun
LightSource "distant"  "point from" [ -30 40  100 ]
   "blackbody L" [3000 1.5]

AttributeBegin
  Material "mirror"
  Shape "sphere" "float radius" 1
AttributeEnd

AttributeBegin
  Texture "checks" "spectrum" "checkerboard"
          "float uscale" [8] "float vscale" [8]
          "rgb tex1" [.1 .1 .1] "rgb tex2" [.8 .8 .8]
  Material "matte" "texture Kd" "checks"
  Translate 0 0 -1
  Shape "trianglemesh"
      "integer indices" [0 1 2 0 2 3]
      "point P" [ -20 -20 0   20 -20 0   20 20 0   -20 20 0 ]
      "float st" [ 0 0   1 0    1 1   0 1 ]
AttributeEnd

WorldEnd