
	// initialize it
	arToolkitContext.init(function onCompleted(){
		// if artoolkit, copy projection matrix to camera
		if( arToolkitContext.parameters.trackingBackend === 'artoolkit' ){
			camera.projectionMatrix.copy( arToolkitContext.getProjectionMatrix() );
		}
	})

	// update artoolkit on every frame
	onRenderFcts.push(function(){
		if( arToolkitSource.ready === false )	return

		arToolkitContext.update( arToolkitSource.domElement )
	})
	/////////////////////////////////////////////////////////////////