The XRRay() constructor creates a new XRRay object which is a geometric ray described by an origin point and a direction vector.

origin Optional

A point object defining the 3-dimensional point in space that the ray originates from, in meters. All dimensions are optional, however, if provided, the origin's w property must be 1.0. The object is initialized to { x: 0.0, y: 0.0, z: 0.0, w: 1.0 } by default.

direction Optional

A vector object defining the ray's 3-dimensional directional vector. All dimensions are optional, however, if provided, the direction's w property must be 0.0. The object is initialized to: { x: 0.0, y: 0.0, z: -1.0, w: 0.0 } by default.

transform Optional

An XRRigidTransform object representing the position and orientation of the ray.

A newly-created XRRay object.

TypeError

Thrown if one of the following conditions is met:

• all of direction's x, y, and z coordinates are zero.
• direction's w coordinate is not 0.0.
• origin's w coordinate is not 1.0.

The XRRay() constructor allows to creating new rays by either providing an origin point and a direction vector, or by passing in an XRRigidTransform object.

// Default configuration
let ray1 = new XRRay();

// Specifying origin, leaving direction as default
let ray2 = new XRRay({ y: 0.5 });

// Specifying both, origin and direction
let origin = { x: 10.0, y: 10.0, z: 10.0, w: 1.0 };
let direction = { x: 10.0, y: 0.0, z: 0.0, w: 0.0 };
let ray3 = new XRRay(origin, direction);

// Using DOMPoint.fromPoint
let ray4 = new XRRay(DOMPoint.fromPoint(origin), DOMPoint.fromPoint(direction));

// Using rigid transform
let rigidTransform = new XRRigidTransform(
  DOMPoint.fromPoint(origin),
  DOMPoint.fromPoint(direction),
);
let ray5 = new XRRay(rigidTransform);

• DOMPoint
• DOMPoint.fromPoint()