getMesh( cameraXR ) {

		if ( this.texture !== null ) {

			if ( this.mesh === null ) {

				const viewport = cameraXR.cameras[ 0 ].viewport;
				const material = new ShaderMaterial( {
					vertexShader: _occlusion_vertex,
					fragmentShader: _occlusion_fragment,
					uniforms: {
						depthColor: { value: this.texture },
						depthWidth: { value: viewport.z },
						depthHeight: { value: viewport.w }
					}
				} );

				this.mesh = new Mesh( new PlaneGeometry( 20, 20 ), material );

			}

		}

		return this.mesh;

	}
Returns a plane mesh that visualizes the depth texture.

@param {ArrayCamera} cameraXR - The XR camera.
@return {?Mesh} The plane mesh.