"use strict"; // 參考 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
////////////////////////////////////////////////////////////////////////////////
// 漫射材質作業
////////////////////////////////////////////////////////////////////////////////

var camera, scene, renderer;
var cameraControls;
var clock = new THREE.Clock();
var ambientLight, light;

function init() {
	var canvasWidth = window.innerWidth;
	var canvasHeight = window.innerHeight;
	var canvasRatio = canvasWidth / canvasHeight;

// 攝影機
	camera = new THREE.PerspectiveCamera( 45, canvasRatio, 1, 80000 );
	camera.position.set( -300, 300, -1000 );
	camera.lookAt(0,0,0);

// 光源
	ambientLight = new THREE.AmbientLight( 0xFFFFFF );

light = new THREE.DirectionalLight( 0xFFFFFF, 0.7 );
	light.position.set( -800, 900, 300 );

// RENDERER
	renderer = new THREE.WebGLRenderer( { antialias: true } );
	renderer.setSize( canvasWidth, canvasHeight );
	renderer.setClearColorHex( 0xAAAAAA, 1.0 );

renderer.gammaInput = true;
	renderer.gammaOutput = true;

// 控制
	cameraControls = new THREE.OrbitAndPanControls( camera, renderer.domElement );
	cameraControls.target.set(0, 0, 0);
}

function createBall() {
	// 不要改變顏色，改變材質的環境光與漫射數值
	var material = new THREE.MeshBasicMaterial( { color: 0x80FC66, shading: THREE.FlatShading } );
	var sphere = new THREE.Mesh( new THREE.SphereGeometry( 400, 64, 32 ), material );
	return sphere;
}

function fillScene() {
	scene = new THREE.Scene();
	scene.fog = new THREE.Fog( 0x808080, 2000, 4000 );

// 光源
	scene.add( ambientLight );
	scene.add( light );

var ball = createBall();
	scene.add( ball );
}

function addToDOM() {
	var container = document.getElementById('container');
	var canvas = container.getElementsByTagName('canvas');
	if (canvas.length>0) {
		container.removeChild(canvas[0]);
	}
	container.appendChild( renderer.domElement );
}

function animate() {
	window.requestAnimationFrame( animate );
	render();
}

function render() {
	var delta = clock.getDelta();
	cameraControls.update(delta);

renderer.render( scene, camera );

}