{
  "filename": "testing.png",
  "image_width": 800,
  "image_height": 600,
  "max_depth": 50,
  "camera": { 
    "anti_alias_rate": 16,
    "fov": 70.0,
    "look_from": [-10, 1, 15],
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    "focus_dist": 15.68
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    { "type": "dielectric", "refraction_index": 1.5},
    { "type": "normal"}
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    { "type": "sphere", "center": [-1, 0, -1], "radius": 0.4, "material": 3},
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 ]
}