function CardboardEffect ( renderer ) {

	    var _camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );

	    var _scene = new THREE.Scene();

	    var _stereo = new THREE.StereoCamera();
	    _stereo.aspect = 0.5;

	    var _params = { minFilter: THREE.LinearFilter, magFilter: THREE.NearestFilter, format: THREE.RGBAFormat };

	    var _renderTarget = new THREE.WebGLRenderTarget( 512, 512, _params );
	    _renderTarget.scissorTest = true;
	    _renderTarget.texture.generateMipmaps = false;

	    /*
	     * Distortion Mesh ported from:
	     * https://github.com/borismus/webvr-boilerplate/blob/master/src/distortion/barrel-distortion-fragment.js
	     */

	    var distortion = new THREE.Vector2( 0.441, 0.156 );

	    var geometry = new THREE.PlaneBufferGeometry( 1, 1, 10, 20 ).removeAttribute( 'normal' ).toNonIndexed();

	    var positions = geometry.attributes.position.array;
	    var uvs = geometry.attributes.uv.array;

	    // duplicate
	    geometry.attributes.position.count *= 2;
	    geometry.attributes.uv.count *= 2;

	    var positions2 = new Float32Array( positions.length * 2 );
	    positions2.set( positions );
	    positions2.set( positions, positions.length );

	    var uvs2 = new Float32Array( uvs.length * 2 );
	    uvs2.set( uvs );
	    uvs2.set( uvs, uvs.length );

	    var vector = new THREE.Vector2();
	    var length = positions.length / 3;

	    for ( var i = 0, l = positions2.length / 3; i < l; i ++ ) {

	        vector.x = positions2[ i * 3 + 0 ];
	        vector.y = positions2[ i * 3 + 1 ];

	        var dot = vector.dot( vector );
	        var scalar = 1.5 + ( distortion.x + distortion.y * dot ) * dot;

	        var offset = i < length ? 0 : 1;

	        positions2[ i * 3 + 0 ] = ( vector.x / scalar ) * 1.5 - 0.5 + offset;
	        positions2[ i * 3 + 1 ] = ( vector.y / scalar ) * 3.0;

	        uvs2[ i * 2 ] = ( uvs2[ i * 2 ] + offset ) * 0.5;

	    }

	    geometry.attributes.position.array = positions2;
	    geometry.attributes.uv.array = uvs2;

	    //

	    var material = new THREE.MeshBasicMaterial( { map: _renderTarget.texture } );
	    var mesh = new THREE.Mesh( geometry, material );
	    _scene.add( mesh );

	    //

	    this.setSize = function ( width, height ) {

	        renderer.setSize( width, height );

	        var pixelRatio = renderer.getPixelRatio();

	        _renderTarget.setSize( width * pixelRatio, height * pixelRatio );

	    };

	    this.render = function ( scene, camera ) {

	        scene.updateMatrixWorld();

	        if ( camera.parent === null ) camera.updateMatrixWorld();

	        _stereo.update( camera );

	        var width = _renderTarget.width / 2;
	        var height = _renderTarget.height;

	        if ( renderer.autoClear ) renderer.clear();

	        _renderTarget.scissor.set( 0, 0, width, height );
	        _renderTarget.viewport.set( 0, 0, width, height );
	        renderer.setRenderTarget( _renderTarget );
	        renderer.render( scene, _stereo.cameraL );

	        renderer.clearDepth();

	        _renderTarget.scissor.set( width, 0, width, height );
	        _renderTarget.viewport.set( width, 0, width, height );
	        renderer.setRenderTarget( _renderTarget );
	        renderer.render( scene, _stereo.cameraR );

	        renderer.clearDepth();

	        renderer.setRenderTarget( null );
	        renderer.render( _scene, _camera );
	    };

	}
@classdesc Google Cardboard Effect Composer
@constructor
@external CardboardEffect
@param {THREE.WebGLRenderer} renderer