numberid 

Unique identifier of a plane.

string, nullorientation 

Plane's specific orientation (horizontal or vertical) or null if orientation is anything else.

object[]points 

Array of DOMPointReadOnly objects. DOMPointReadOnly is an object with x y z properties that defines a local point of a plane's polygon.

// prepare reusable objects
const vecA = new pc.Vec3();
const vecB = new pc.Vec3();
const color = new pc.Color(1, 1, 1);

// update Mat4 to plane position and rotation
transform.setTRS(plane.getPosition(), plane.getRotation(), pc.Vec3.ONE);

// draw lines between points
for (let i = 0; i < plane.points.length; i++) {
    vecA.copy(plane.points[i]);
    vecB.copy(plane.points[(i + 1) % plane.points.length]);

    // transform from planes local to world coords
    transform.transformPoint(vecA, vecA);
    transform.transformPoint(vecB, vecB);

    // render line
    app.drawLine(vecA, vecB, color);
}

getPosition() 

Get the world space position of a plane.

Returns

Vec3

The world space position of a plane.

getRotation() 

Get the world space rotation of a plane.

Returns

Quat

The world space rotation of a plane.

change 

Fired when XrPlane attributes such as: orientation and/or points have been changed. Position and rotation can change at any time without triggering a change event.

plane.on('change', function () {
    // plane has been changed
});

remove 

Fired when XrPlane is removed.

plane.once('remove', function () {
    // plane is not available anymore
});