tinygltf/examples/raytrace/config.json

{ "obj_filename" : "cornellbox_suzanne.obj",
  "scene_scale" : 1.0,
  "width" : 512,
  "height" : 512,
  "eye" : [0, 2.5, 15],
  "up" : [0, 1, 0],
  "look_at" : [0, 0, 0],
  "dummy" : 0
}