three.js/src/core/Raycaster.js

/**
 * @author mrdoob / http://mrdoob.com/
 * @author bhouston / http://exocortex.com/
 * @author stephomi / http://stephaneginier.com/
 */

( function ( THREE ) {

	THREE.Raycaster = function ( origin, direction, near, far ) {

		this.ray = new THREE.Ray( origin, direction );
		// direction is assumed to be normalized (for accurate distance calculations)

		this.near = near || 0;
		this.far = far || Infinity;

		this.params = {
			Sprite: {},
			Mesh: {},
			PointCloud: { threshold: 1 },
			LOD: {},
			Line: {}
		};

	};

	var descSort = function ( a, b ) {

		return a.distance - b.distance;

	};

	var intersectObject = function ( object, raycaster, intersects, recursive ) {

		object.raycast( raycaster, intersects );

		if ( recursive === true ) {

			var children = object.children;

			for ( var i = 0, l = children.length; i < l; i ++ ) {

				intersectObject( children[ i ], raycaster, intersects, true );

			}

		}

	};

	//

	THREE.Raycaster.prototype.precision = 0.0001;
	THREE.Raycaster.prototype.linePrecision = 1;

	THREE.Raycaster.prototype.set = function ( origin, direction ) {

		this.ray.set( origin, direction );
		// direction is assumed to be normalized (for accurate distance calculations)

	};

	THREE.Raycaster.prototype.intersectObject = function ( object, recursive ) {

		var intersects = [];
		
		intersectObject( object, this, intersects, recursive );

		intersects.sort( descSort );

		return intersects;

	};

	THREE.Raycaster.prototype.intersectObjects = function ( objects, recursive ) {

		var intersects = [];

		for ( var i = 0, l = objects.length; i < l; i ++ ) {

			intersectObject( objects[ i ], this, intersects, recursive );

		}

		intersects.sort( descSort );

		return intersects;

	};

}( THREE ) );