source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/mrdoob-three.js-4862f5f/src/lights/DirectionalLight.js

/**
 * @author mrdoob / http://mrdoob.com/
 * @author alteredq / http://alteredqualia.com/
 */

THREE.DirectionalLight = function ( hex, intensity ) {

    THREE.Light.call( this, hex );

    this.position.set( 0, 1, 0 );
    this.target = new THREE.Object3D();

    this.intensity = ( intensity !== undefined ) ? intensity : 1;

    this.castShadow = false;
    this.onlyShadow = false;

    //

    this.shadowCameraNear = 50;
    this.shadowCameraFar = 5000;

    this.shadowCameraLeft = -500;
    this.shadowCameraRight = 500;
    this.shadowCameraTop = 500;
    this.shadowCameraBottom = -500;

    this.shadowCameraVisible = false;

    this.shadowBias = 0;
    this.shadowDarkness = 0.5;

    this.shadowMapWidth = 512;
    this.shadowMapHeight = 512;

    //

    this.shadowCascade = false;

    this.shadowCascadeOffset = new THREE.Vector3( 0, 0, -1000 );
    this.shadowCascadeCount = 2;

    this.shadowCascadeBias = [ 0, 0, 0 ];
    this.shadowCascadeWidth = [ 512, 512, 512 ];
    this.shadowCascadeHeight = [ 512, 512, 512 ];

    this.shadowCascadeNearZ = [ -1.000, 0.990, 0.998 ];
    this.shadowCascadeFarZ  = [  0.990, 0.998, 1.000 ];

    this.shadowCascadeArray = [];

    //

    this.shadowMap = null;
    this.shadowMapSize = null;
    this.shadowCamera = null;
    this.shadowMatrix = null;

};

THREE.DirectionalLight.prototype = Object.create( THREE.Light.prototype );

THREE.DirectionalLight.prototype.clone = function () {

    var light = new THREE.DirectionalLight();

    THREE.Light.prototype.clone.call( this, light );

    light.target = this.target.clone();

    light.intensity = this.intensity;

    light.castShadow = this.castShadow;
    light.onlyShadow = this.onlyShadow;

    return light;

};