egret-docs-master/Engine3D/Egret3DDisp/baseOp
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README.md fist commit 2024-06-19 13:32:32 +08:00

README.md

Egret3D内置了多个常用几何体我们可以使用这些默认提供的几何体快速制作一个三维场景Demo。

要想正确显示一个3D显示对象你需要准备三个必要元素。

  • 几何体模型
  • 贴图纹理
  • 网格

下面介绍三个元素的创建与使用方法。

创建几何体模型

我们使用最为简单的立方体作为演示,代码如下:

var geom:egret3d.CubeGeometry = new egret3d.CubeGeometry();

创建贴图纹理

var mater:egret3d.TextureMaterial = new egret3d.TextureMaterial();

创建网格

var cube:egret3d.Mesh = new egret3d.Mesh(geom, mater);

添加到场景中进行渲染

this._view3D.addChild3D( cube );

改变网格旋转角度

cube.rotation = new egret3d.Vector3D(50,30,0);

编译并运行,效果如图:

完整代码如下:

class ObjectDemo extends LoadingUI {

    protected _egret3DCanvas: egret3d.Egret3DCanvas;
    protected _view3D: egret3d.View3D;
    private cameraCtl: egret3d.LookAtController;
    private lights: egret3d.LightGroup = new egret3d.LightGroup();
    private model: egret3d.Mesh;
    private idle: egret3d.SkeletonAnimationClip;
    private run: egret3d.SkeletonAnimationClip;
    private attack: egret3d.SkeletonAnimationClip;
    public currentAnim: string;


    public constructor() {

        super();

        ///创建Canvas对象。
        this._egret3DCanvas = new egret3d.Egret3DCanvas();
        ///Canvas的起始坐标页面左上角为起始坐标(0,0)。
        this._egret3DCanvas.x = 0;
        this._egret3DCanvas.y = 0;
        ///设置Canvas页面尺寸。
        this._egret3DCanvas.width = window.innerWidth;
        this._egret3DCanvas.height = window.innerHeight;
        ///创建View3D对象,页面左上角为起始坐标(0,0),其参数依次为:
        ///@param x: number 起始坐标x,
        ///@param y: number 起始坐标y
        ///@param  width: number 显示区域的宽
        ///@param  height: number 显示区域的高
        this._view3D = new egret3d.View3D(0,0,window.innerWidth,window.innerHeight);
        ///当前对象对视位置,其参数依次为:
        ///@param pos 对象的位置
        ///@param target 目标的位置
        this._view3D.camera3D.lookAt(new egret3d.Vector3D(0,0,1000),new egret3d.Vector3D(0,0,0));
        ///View3D的背景色设置
        this._view3D.backColor = 0xffffffff;
        ///将View3D添加进Canvas中
        this._egret3DCanvas.addView3D(this._view3D);

        ///创建平行光
        var dirLight: egret3d.DirectLight = new egret3d.DirectLight(new egret3d.Vector3D(-0.5,0.6,0.2));
        dirLight.diffuse = 0xffffff;
        this.lights.addLight(dirLight);

        ///启动Canvas。
        this._egret3DCanvas.start();

        this.CloseLoadingView()
 
        var geom:egret3d.CubeGeometry = new egret3d.CubeGeometry();
        var mater:egret3d.TextureMaterial = new egret3d.TextureMaterial();
        var cube:egret3d.Mesh = new egret3d.Mesh(geom, mater);
        this._view3D.addChild3D( cube );
        
        cube.rotation = new egret3d.Vector3D(50,30,0);
    }

  
}