/** A 2D vector */
export type Vec2 = [x: number, y: number];
/** A 3D vector */
export type Vec3 = [x: number, y: number, z: number];
/** A 4D vector */
export type Vec4 = [x: number, y: number, z: number, w: number];
/** A quaternion that represents rotation */
export type Quat = [x: number, y: number, z: number, w: number];
/** A dual quaternion that represents both rotation and translation */
export type Quat2 = [x: number, y: number, z: number, w: number, x2: number, y2: number, z2: number, w2: number];
/** A 2x2 matrix */
export type Mat2 = [e1: number, e2: number, e3: number, e4: number];
/** A 3x3 matrix */
export type Mat3 = [e1: number, e2: number, e3: number, e4: number, e5: number, e6: number, e7: number, e8: number, e9: number];
/** A 4x4 matrix */
export type Mat4 = [
    e1: number,
    e2: number,
    e3: number,
    e4: number,
    e5: number,
    e6: number,
    e7: number,
    e8: number,
    e9: number,
    e10: number,
    e11: number,
    e12: number,
    e13: number,
    e14: number,
    e15: number,
    e16: number
];
/** A 2D affine transform matrix */
export type Mat2d = [e1: number, e2: number, e3: number, e4: number, e5: number, e6: number];
/** A box in 3D space */
export type Box3 = [minX: number, minY: number, minZ: number, maxX: number, maxY: number, maxZ: number];
/** A oriented bounding box in 3D space */
export type OBB3 = {
    center: Vec3;
    halfExtents: Vec3;
    rotation: Mat3;
};
/** Euler orders */
export type EulerOrder = 'xyz' | 'xzy' | 'yxz' | 'yzx' | 'zxy' | 'zyx';
/** A Euler in 3D space, with an optional order (default is 'xyz') */
export type Euler = [x: number, y: number, z: number, order?: EulerOrder];
/**
 * A plane in 3D space
 * normal - a unit length vector defining the normal of the plane.
 * constant - the signed distance from the origin to the plane.
 */
export type Plane3 = {
    normal: Vec3;
    constant: number;
};
/** A sphere in 3D space */
export type Sphere = {
    center: Vec3;
    radius: number;
};
/**
 * A point in spherical coordinates [r, theta, phi] (Three.js / OpenGL convention)
 *  r     - radial distance from the origin
 *  theta - azimuthal angle in the XZ plane from the +Z axis (radians, range [-π, π])
 *  phi   - polar angle from the +Y axis (radians, range [0, π])
 */
export type Spherical = [r: number, theta: number, phi: number];
/** A circle in 2D space */
export type Circle = {
    center: Vec2;
    radius: number;
};
/** A ray in 3D space */
export type Ray3 = {
    origin: Vec3;
    direction: Vec3;
};
export type MutableArrayLike<T> = {
    [index: number]: T;
    length: number;
};