tinygltf/examples/raytrace/config.json

{ "gltf_filename" : "../../models/Cube/Cube.gltf",
  "scene_scale" : 1.0,
  "width" : 512,
  "height" : 512,
  "eye" : [0, 2.5, 15],
  "up" : [0, 1, 0],
  "look_at" : [0, 0, 0],
  "dummy" : 0
}