fromJson static method

DVSceneCameraData fromJson(Object? json, String path)

Implementation

static DVSceneCameraData fromJson(Object? json, String path) {
  final Map<String, Object?> map = _map(json, path);
  if (map['projection'] != 'perspective') {
    throw DV3DSceneFormatException(
        '$path.projection', "only 'perspective' is supported");
  }
  final double fov = _number(map['fovY'] ?? 45, '$path.fovY');
  final double near = _number(map['near'] ?? 0.1, '$path.near');
  final double far = _number(map['far'] ?? 1000, '$path.far');
  if (fov <= 0 || fov >= 180) {
    throw DV3DSceneFormatException('$path.fovY', 'must be between 0 and 180');
  }
  if (near <= 0 || far <= near) {
    throw DV3DSceneFormatException(
        '$path.near', 'near must be positive and less than far');
  }
  final Object? orbit = map['orbit'];
  if (orbit == null) {
    return DVSceneCameraData.perspective(fovYDegrees: fov, near: near, far: far);
  }
  final Map<String, Object?> o = _map(orbit, '$path.orbit');
  final double distance = _number(o['distance'], '$path.orbit.distance');
  if (distance <= 0) {
    throw DV3DSceneFormatException(
        '$path.orbit.distance', 'must be positive');
  }
  final double yaw = _number(o['yaw'] ?? 0, '$path.orbit.yaw');
  final double pitch = _number(o['pitch'] ?? 0, '$path.orbit.pitch');
  if (pitch < -90 || pitch > 90) {
    throw DV3DSceneFormatException('$path.orbit.pitch', 'must be between -90 and 90 degrees');
  }
  return DVSceneCameraData._(
    fovYDegrees: fov,
    near: near,
    far: far,
    orbitTarget: _vec3(o['target'] ?? const <double>[0, 0, 0], '$path.orbit.target'),
    orbitDistance: distance,
    controls: _bool(o['controls'] ?? false, '$path.orbit.controls'),
    orbitYawDegrees: yaw,
    orbitPitchDegrees: pitch,
  );
}