Function getProjectionParameters

docs/tests/v2/es6/js/sanddance.js:38090–38112

(_ref8)

}

function getProjectionParameters(_ref8) {
  var width = _ref8.width,
      height = _ref8.height,
      _ref8$altitude = _ref8.altitude,
      altitude = _ref8$altitude === void 0 ? DEFAULT_ALTITUDE : _ref8$altitude,
      _ref8$pitch = _ref8.pitch,
      pitch = _ref8$pitch === void 0 ? 0 : _ref8$pitch,
      _ref8$nearZMultiplier = _ref8.nearZMultiplier,
      nearZMultiplier = _ref8$nearZMultiplier === void 0 ? 1 : _ref8$nearZMultiplier,
      _ref8$farZMultiplier = _ref8.farZMultiplier,
      farZMultiplier = _ref8$farZMultiplier === void 0 ? 1 : _ref8$farZMultiplier;
  var pitchRadians = pitch * DEGREES_TO_RADIANS;
  var halfFov = Math.atan(0.5 / altitude);
  var topHalfSurfaceDistance = Math.sin(halfFov) * altitude / Math.sin(Math.PI / 2 - pitchRadians - halfFov);
  var farZ = Math.cos(Math.PI / 2 - pitchRadians) * topHalfSurfaceDistance + altitude;
  return {
    fov: 2 * Math.atan(height / 2 / altitude),
    aspect: width / height,
    focalDistance: altitude,
    near: nearZMultiplier,
    far: farZ * farZMultiplier
  };
}

function getProjectionMatrix(_ref9) {
  var width = _ref9.width,