104 lines
3.9 KiB
Markdown
104 lines
3.9 KiB
Markdown
平行光
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* 演示准备
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创建一个演示场景：
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class Main {
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protected _egret3DCanvas: egret3d.Egret3DCanvas;
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protected view1: egret3d.View3D;
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protected cameraCtl: egret3d.LookAtController;
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public constructor() {
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///创建3DCanvas
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this._egret3DCanvas = new egret3d.Egret3DCanvas();
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this._egret3DCanvas.x = 0;
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this._egret3DCanvas.y = 0;
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this._egret3DCanvas.width = window.innerWidth;
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this._egret3DCanvas.height = window.innerHeight;
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this._egret3DCanvas.start();
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///创建View3D
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this.view1 = new egret3d.View3D(0, 0, window.innerWidth, window.innerHeight);
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this.view1.camera3D.lookAt(new egret3d.Vector3D(0, 100, -100), new egret3d.Vector3D(0, 0, 0));
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this.view1.backColor = 0xff888888;
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this._egret3DCanvas.addView3D(this.view1);
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///创建相机控制器
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this.cameraCtl = new egret3d.LookAtController(this.view1.camera3D, new egret3d.Object3D());
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this.cameraCtl.distance = 150;
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this.cameraCtl.rotationX = 60;
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///启动3DCanvas，注册每帧更新事件
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this._egret3DCanvas.start();
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this._egret3DCanvas.addEventListener(egret3d.Event3D.ENTER_FRAME, this.update, this);
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///创建立方体，放置于场景内(0,0,0)位置
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var mat_cube: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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var cube = new egret3d.Mesh(geometery_Cube, mat_cube);
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this.view1.addChild3D(cube);
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///创建面片，放置于场景内(0,0,0)位置
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var mat_Plane: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Plane: egret3d.PlaneGeometry = new egret3d.PlaneGeometry();
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var plane = new egret3d.Mesh(geometery_Plane, mat_Plane);
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this.view1.addChild3D(plane);
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}
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public update(e: egret3d.Event3D) {
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///更新控制器
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this.cameraCtl.update();
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}
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}
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* DirectLight 方向光
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1）什么是方向光：
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平行光又称为方向光（Directional Light），是一组没有衰减的平行的光线，类似太阳光的效果。
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2）方向光的模型如图：
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3) 给演示场景添加一个方向光：
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在演示代码的构造函数尾部我们可以添加如下代码：
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///创建一个灯光组，该灯光组将管理场景内的灯光资源
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var lights: egret3d.LightGroup = new egret3d.LightGroup();
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///创建一个方向光对象，其中参数(-0.5, -0.6, 0.2)为方向向量，为灯光方向，默认方向为0, 0, 1)。
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var dirLight: egret3d.DirectLight = new egret3d.DirectLight(new egret3d.Vector3D(-0.5, -0.6, 0.2));
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///灯光漫反射颜色是红色，默认为白色
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dirLight.diffuse = 0xff0000;
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///写入组
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lights.addLight(dirLight);
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///设置灯效组。
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cube.material.lightGroup = lights;
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plane.material.lightGroup = lights;
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还可以修改灯光的背光颜色，如下所示：
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///创建一个灯光组，该灯光组将管理场景内的灯光资源
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var lights: egret3d.LightGroup = new egret3d.LightGroup();
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///创建一个方向光对象，其中参数(-0.5, -0.6, 0.2)为方向向量，为灯光方向，默认方向为0, 0, 1)。
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var dirLight: egret3d.DirectLight = new egret3d.DirectLight(new egret3d.Vector3D(-0.5, -0.6, 0.2));
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///灯光漫反射颜色是红色，默认为白色
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dirLight.diffuse = 0xff0000;
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///灯光背光颜色是灰色，默认为黑色
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dirLight.ambient = 0x505050;
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///写入组
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lights.addLight(dirLight);
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///设置灯效组。
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cube.material.lightGroup = lights;
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plane.material.lightGroup = lights;
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