1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  * @author alteredq / http://alteredqualia.com/
  4  */
  5 
  6 /**@constructor*/
  7 THREE.Frustum = function ( ) {
  8 
  9 	this.planes = [
 10 
 11 		new THREE.Vector4(),
 12 		new THREE.Vector4(),
 13 		new THREE.Vector4(),
 14 		new THREE.Vector4(),
 15 		new THREE.Vector4(),
 16 		new THREE.Vector4()
 17 
 18 	];
 19 
 20 };
 21 
 22 THREE.Frustum.prototype.setFromMatrix = function ( m ) {
 23 
 24 	var plane;
 25 	var planes = this.planes;
 26 
 27 	var me = m.elements;
 28 	var me0 = me[0], me1 = me[1], me2 = me[2], me3 = me[3];
 29 	var me4 = me[4], me5 = me[5], me6 = me[6], me7 = me[7];
 30 	var me8 = me[8], me9 = me[9], me10 = me[10], me11 = me[11];
 31 	var me12 = me[12], me13 = me[13], me14 = me[14], me15 = me[15];
 32 
 33 	planes[ 0 ].set( me3 - me0, me7 - me4, me11 - me8, me15 - me12 );
 34 	planes[ 1 ].set( me3 + me0, me7 + me4, me11 + me8, me15 + me12 );
 35 	planes[ 2 ].set( me3 + me1, me7 + me5, me11 + me9, me15 + me13 );
 36 	planes[ 3 ].set( me3 - me1, me7 - me5, me11 - me9, me15 - me13 );
 37 	planes[ 4 ].set( me3 - me2, me7 - me6, me11 - me10, me15 - me14 );
 38 	planes[ 5 ].set( me3 + me2, me7 + me6, me11 + me10, me15 + me14 );
 39 
 40 	for ( var i = 0; i < 6; i ++ ) {
 41 
 42 		plane = planes[ i ];
 43 		plane.divideScalar( Math.sqrt( plane.x * plane.x + plane.y * plane.y + plane.z * plane.z ) );
 44 
 45 	}
 46 
 47 };
 48 
 49 THREE.Frustum.prototype.contains = function ( object ) {
 50 
 51 	var distance = 0.0;
 52 	var planes = this.planes;
 53 	var matrix = object.matrixWorld;
 54 	var me = matrix.elements;
 55 	var radius = - object.geometry.boundingSphere.radius * matrix.getMaxScaleOnAxis();
 56 
 57 	for ( var i = 0; i < 6; i ++ ) {
 58 
 59 		distance = planes[ i ].x * me[12] + planes[ i ].y * me[13] + planes[ i ].z * me[14] + planes[ i ].w;
 60 		if ( distance <= radius ) return false;
 61 
 62 	}
 63 
 64 	return true;
 65 
 66 };
 67 
 68 THREE.Frustum.__v1 = new THREE.Vector3();
 69 

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