function Scene3D()
{
	this.canvas;	
	this.engine;
	this.scene;
	this.camera;
	this.light;
};

Scene3D.prototype.setLights = function (){
	
	var DLight1 = new BABYLON.DirectionalLight("dl", new BABYLON.Vector3(1,-1,1), this.scene);
	//DLight1.specular=new BABYLON.Color3(2, 2, 2);
	var DLight2 = new BABYLON.DirectionalLight("dl", new BABYLON.Vector3(-1,-1,1), this.scene);
	//DLight2.specular=new BABYLON.Color3(2, 2, 2);
	var SpotLight = new BABYLON.SpotLight("sl", new BABYLON.Vector3(-10,10,0), new BABYLON.Vector3(10,-10,0), Math.PI*1.5, 1, this.scene)
	
	/*
	var light0 = new BABYLON.PointLight("Omni0", new BABYLON.Vector3(1.9,3.2,4.5), this.scene);
	//light0.diffuse = new BABYLON.Color3(1, 0, 0);
	//light0.specular = new BABYLON.Color3(1, 1, 1);
	light0.intensity = 3.3;
	*/
	
	/*
	var light1 = new BABYLON.HemisphericLight("hemi", new BABYLON.Vector3(600, 600, 0), this.scene);
	light1.diffuse = new BABYLON.Color3(1, 1, 1);	
	light1.specular = new BABYLON.Color3(0.3, 0.3, 0.3);
	light1.position = new BABYLON.Vector3(250, 400, 0);
	light1.intensity = 2;
	*/

/*
	var light1 = new BABYLON.PointLight("Omni1", new BABYLON.Vector3(8.6,13.4,-0.9), this.scene);
	//light1.diffuse = new BABYLON.Color3(1, 0, 0);
	//light1.specular = new BABYLON.Color3(1, 1, 1);
	light1.intensity = 8.4;

	var light2 = new BABYLON.PointLight("Omni2", new BABYLON.Vector3(-3.5,-6.9,7.2), this.scene);
	//light2.diffuse = new BABYLON.Color3(1, 0, 0);
	//light2.specular = new BABYLON.Color3(1, 1, 1);
	light2.intensity = 7.3;
	*/
}

Scene3D.prototype.setCamera = function () {
	// Create a rotating camera
	this.camera = new BABYLON.ArcRotateCamera("Camera", -Math.PI/2, 0, 1000, BABYLON.Vector3.Zero(), this.scene);
	this.camera.attachControl(this.canvas, true);
	this.camera.lowerBetaLimit = 0.1;
	this.camera.upperBetaLimit = (Math.PI / 2) * 0.99;
	this.camera.lowerRadiusLimit = 125;
	this.camera.checkCollisions = true;
};

Scene3D.prototype.setFreeCamera=function()
{
	var followCam = new BABYLON.FollowCamera("fcam", this.camera.position, this.scene);
	followCam.radius = 200;
	followCam.maxCameraSpeed = 10;
	return followCam;
};

Scene3D.prototype.setProductCamera = function (position) {
	this.camera.setTarget=position;
};

Scene3D.prototype.createScene = function () {
	// Attach it to handle user inputs (keyboard, mouse, touch)
	this.canvas=document.getElementById('canvas3d');	
	this.engine = new BABYLON.Engine(this.canvas, true);
	this.scene = new BABYLON.Scene(this.engine);
	
	this.setCamera();
	this.setLights();	
	//this.scene.debugLayer.show();
};

//实时渲染
Scene3D.prototype.render= function () {
	 this.scene.collisionsEnabled = true;
	 var scene=this.scene;
	 this.engine.runRenderLoop(
	   	function () {
	   		scene.render();
	   	}
    );
};