three.js/src/objects/Line.js

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

THREE.Line = function ( geometry, material, type ) {

	THREE.Object3D.call( this );

	this.geometry = geometry !== undefined ? geometry : new THREE.Geometry();
	this.material = material !== undefined ? material : new THREE.LineBasicMaterial( { color: Math.random() * 0xffffff } );

	this.type = ( type !== undefined ) ? type : THREE.LineStrip;

};

THREE.LineStrip = 0;
THREE.LinePieces = 1;

THREE.Line.prototype = Object.create( THREE.Object3D.prototype );

THREE.Line.prototype.raycast = ( function () {

	var inverseMatrix = new THREE.Matrix4();
	var ray = new THREE.Ray();
	var sphere = new THREE.Sphere();

	return function ( raycaster, intersects ) {
	
		var precision = raycaster.linePrecision;
		var precisionSq = precision * precision;

		var geometry = this.geometry;

		if ( geometry.boundingSphere === null ) geometry.computeBoundingSphere();

		// Checking boundingSphere distance to ray

		sphere.copy( geometry.boundingSphere );
		sphere.applyMatrix4( this.matrixWorld );
	
		if ( raycaster.ray.isIntersectionSphere( sphere ) === false ) {

			return;

		}
	
		inverseMatrix.getInverse( this.matrixWorld );
		ray.copy( raycaster.ray ).applyMatrix4( inverseMatrix );

		/* if ( geometry instanceof THREE.BufferGeometry ) {

		} else */ if ( geometry instanceof THREE.Geometry ) {

			var vertices = geometry.vertices;
			var nbVertices = vertices.length;
			var interSegment = new THREE.Vector3();
			var interRay = new THREE.Vector3();
			var step = this.type === THREE.LineStrip ? 1 : 2;

			for ( var i = 0; i < nbVertices - 1; i = i + step ) {

				var distSq = ray.distanceSqToSegment( vertices[ i ], vertices[ i + 1 ], interRay, interSegment );

				if ( distSq > precisionSq ) continue;

				var distance = ray.origin.distanceTo( interRay );

				if ( distance < raycaster.near || distance > raycaster.far ) continue;

				intersects.push( {

					distance: distance,
					// What do we want? intersection point on the ray or on the segment??
					// point: raycaster.ray.at( distance ),
					point: interSegment.clone().applyMatrix4( this.matrixWorld ),
					face: null,
					faceIndex: null,
					object: this

				} );

			}

		}

	};

}() );

THREE.Line.prototype.clone = function ( object ) {

	if ( object === undefined ) object = new THREE.Line( this.geometry, this.material, this.type );

	THREE.Object3D.prototype.clone.call( this, object );

	return object;

};