import * as THREE from "three";
declare class SensorSample {
    sample: THREE.Vector3;
    timestampS: number;
    constructor(sample?: THREE.Vector3, timestampS?: number);
    set(sample: THREE.Vector3, timestampS: number): void;
    copy(sensorSample: SensorSample): void;
}
/**
 * An implementation of a simple complementary filter, which fuses gyroscope and
 * accelerometer data from the 'devicemotion' event.
 *
 * Accelerometer data is very noisy, but stable over the long term.
 * Gyroscope data is smooth, but tends to drift over the long term.
 *
 * This fusion is relatively simple:
 * 1. Get orientation estimates from accelerometer by applying a low-pass filter
 *    on that data.
 * 2. Get orientation estimates from gyroscope by integrating over time.
 * 3. Combine the two estimates, weighing (1) in the long term, but (2) for the
 *    short term.
 */
declare class ComplementaryFilter {
    kFilter: number;
    isDebug: boolean;
    currentAccelMeasurement: SensorSample;
    currentGyroMeasurement: SensorSample;
    previousGyroMeasurement: SensorSample;
    filterQ: THREE.Quaternion;
    previousFilterQ: THREE.Quaternion;
    accelQ: THREE.Quaternion;
    isOrientationInitialized: boolean;
    estimatedGravity: THREE.Vector3;
    measuredGravity: THREE.Vector3;
    gyroIntegralQ: THREE.Quaternion;
    constructor(kFilter: number, isDebug: boolean);
    addAccelMeasurement(vector: THREE.Vector3, timestampS: number): void;
    addGyroMeasurement(vector: THREE.Vector3, timestampS: number): void;
    getOrientation(): THREE.Quaternion;
    private run_;
    private accelToQuaternion_;
    private gyroToQuaternionDelta_;
}
/**
 * Given an orientation and the gyroscope data, predicts the future orientation
 * of the head. This makes rendering appear faster.
 *
 * Also see: http://msl.cs.uiuc.edu/~lavalle/papers/LavYerKatAnt14.pdf
 *
 * @param predictionTimeS - time from head movement to the appearance of
 * the corresponding image.
 */
declare class PosePredictor {
    predictionTimeS: number;
    isDebug: boolean;
    previousQ: THREE.Quaternion;
    previousTimestampS: number | null;
    deltaQ: THREE.Quaternion;
    outQ: THREE.Quaternion;
    constructor(predictionTimeS: number, isDebug: boolean);
    getPrediction(currentQ: THREE.Quaternion, gyro: THREE.Vector3, timestampS: number): THREE.Quaternion;
}
declare class Pose {
    angularAcceleration: Float32Array | null;
    angularVelocity: Float32Array | null;
    linearAcceleration: Float32Array | null;
    linearVelocity: Float32Array | null;
    orientation: Float32Array | null;
    position: Float32Array | null;
    constructor();
}
declare class FrameData {
    leftProjectionMatrix: Float32Array;
    leftViewMatrix: Float32Array;
    pose: Pose;
    rightProjectionMatrix: Float32Array;
    rightViewMatrix: Float32Array;
    timestamp: number;
    constructor();
}
declare class FieldOfView {
    leftDegrees: number;
    rightDegrees: number;
    upDegrees: number;
    downDegrees: number;
    constructor();
}
/**
 * The pose sensor, implemented using DeviceMotion APIs.
 */
declare class Sensor {
    viewer: {
        id?: string;
        label?: string;
        fov: number;
        interLensDistance: number;
        baselineLensDistance: number;
        screenLensDistance: number;
        distortionCoefficients: [number, number];
        inverseCoefficients: number[];
    };
    device: {
        widthMeters: number;
        heightMeters: number;
        bevelMeters: number;
    };
    depthNear: number;
    depthFar: number;
    yawOnly: boolean;
    accelerometer: THREE.Vector3;
    gyroscope: THREE.Vector3;
    filter: ComplementaryFilter;
    posePredictor: PosePredictor;
    isFirefoxAndroid: boolean;
    isIOS: boolean;
    isDeviceMotionInRadians: boolean;
    isWithoutDeviceMotion: boolean;
    filterToWorldQ: THREE.Quaternion;
    inverseWorldToScreenQ: THREE.Quaternion;
    worldToScreenQ: THREE.Quaternion;
    originalPoseAdjustQ: THREE.Quaternion;
    resetQ: THREE.Quaternion;
    private previousTimestampS;
    private orientationOut_;
    private _deviceOrientationQ?;
    private deviceOrientationFixQ?;
    private deviceOrientationFilterToWorldQ?;
    constructor(kFilter: number, predictionTime: number, yawOnly: boolean, isDebug: boolean);
    getPosition(): any;
    getOrientation(): Float32Array<ArrayBufferLike>;
    getPose(): Pose;
    resetPose(): void;
    getFrameData(frameData: FrameData): FrameData;
    start(): () => void;
    getEyeOffset(): {
        left: number[];
        right: number[];
    };
    getEyeProjectionMatrix(): {
        left: number[];
        right: number[];
    };
    getEyeFieldOfView(): {
        left: FieldOfView;
        right: FieldOfView;
    };
    private onDeviceOrientation_;
    private onDeviceMotion_;
    private updateDeviceMotion_;
    private onOrientationChange_;
    /**
     * This is only needed if we are in an cross origin iframe on iOS to work around
     * this issue: https://bugs.webkit.org/show_bug.cgi?id=152299.
     */
    private onMessage_;
    private setScreenTransform_;
}
export { Sensor, Pose, FrameData, FieldOfView };