three.js/src/extras/helpers/AxisHelper.js

import { LineSegments } from '../../objects/LineSegments';
import { VertexColors } from '../../constants';
import { LineBasicMaterial } from '../../materials/LineBasicMaterial';
import { BufferAttribute } from '../../core/BufferAttribute';
import { BufferGeometry } from '../../core/BufferGeometry';

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

function AxisHelper( size ) {

	size = size || 1;

	var vertices = new Float32Array( [
		0, 0, 0,  size, 0, 0,
		0, 0, 0,  0, size, 0,
		0, 0, 0,  0, 0, size
	] );

	var colors = new Float32Array( [
		1, 0, 0,  1, 0.6, 0,
		0, 1, 0,  0.6, 1, 0,
		0, 0, 1,  0, 0.6, 1
	] );

	var geometry = new BufferGeometry();
	geometry.addAttribute( 'position', new BufferAttribute( vertices, 3 ) );
	geometry.addAttribute( 'color', new BufferAttribute( colors, 3 ) );

	var material = new LineBasicMaterial( { vertexColors: VertexColors } );

	LineSegments.call( this, geometry, material );

};

AxisHelper.prototype = Object.create( LineSegments.prototype );
AxisHelper.prototype.constructor = AxisHelper;


export { AxisHelper };