this.direction.copy( v ).sub( this.origin ).normalize();

return this;

},

recast: function () {

return function ( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {

// It returns the min distance between the ray and the segment

// defined by v0 and v1

// It can also set two optional targets :

return function ( a, b, c, backfaceCulling, optionalTarget ) {

edge1.subVectors( b, a );

edge2.subVectors( c, a );

this.getMaxPrecision = getMaxPrecision;

this.logarithmicDepthBuffer = parameters.logarithmicDepthBuffer !== undefined ? parameters.logarithmicDepthBuffer : false;

this.maxTextures = gl.getParameter( gl.MAX_TEXTURE_IMAGE_UNITS );