[]关于平行光渲染投影问题，求解惑

// 程序入口

class LayaAir3D {

    private _quaternion: Laya.Quaternion = new Laya.Quaternion();



    constructor() {

        //初始化引擎

        Laya3D.init(0, 0, true);



        //适配模式

        Laya.stage.scaleMode = Laya.Stage.SCALE_FULL;

        Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;



        let ape: Laya.Sprite = new Laya.Sprite();

        Laya.stage.addChild(ape);

        ape.loadImage("../laya/assets/fish_bg.png");



        //开启统计信息

        Laya.Stat.show();



        //添加3D场景

        let scene: Laya.Scene = Laya.stage.addChild(new Laya.Scene()) as Laya.Scene;

        

        //添加照相机

        let camera: Laya.Camera = (scene.addChild(new Laya.Camera(0, 0.1, 1000))) as Laya.Camera;

        camera.orthographic = true;

        camera.transform.translate(new Laya.Vector3(0, 4, 8),false);

        camera.transform.lookAt(new Laya.Vector3(0,0,0),new Laya.Vector3(0,1,0));

        

        //创建方向光

        var light:Laya.DirectionLight = scene.addChild(new Laya.DirectionLight()) as Laya.DirectionLight;

        //移动灯光位置

        light.transform.translate(new Laya.Vector3(-5,10,-5));

        //设置灯光方向

        light.direction = new Laya.Vector3(1, -1, 1);

        //添加灯光投影

        light.shadow=true;

        //产生投影的范围（如过小将不会产生投影）

        light.shadowDistance=100;

        //生成阴影贴图数量

        light.shadowPSSMCount = 1;

        //模糊等级,越大越高,效果更好，更耗性能

        light.shadowPCFType=10;

        //投影质量

        light.shadowResolution=2048;



        //创建盒子模型

        let box:Laya.MeshSprite3D = scene.addChild(new Laya.MeshSprite3D(new Laya.BoxMesh(5,5,1.5))) as Laya.MeshSprite3D;

        //接受阴影

         

        box.meshRender.receiveShadow=true;

       // 创建球体模型

        let sphere:Laya.MeshSprite3D = scene.addChild(new Laya.MeshSprite3D(new Laya.SphereMesh(.5))) as Laya.MeshSprite3D;

        //按父空间移动球体

        sphere.transform.translate(new Laya.Vector3(0,1.5,0),false);

        //产生阴影

        sphere.meshRender.castShadow=true;

        //创建材质

        let material:Laya.StandardMaterial = new Laya.StandardMaterial();

        //材质加载漫反射贴图

        material.diffuseTexture = Laya.Texture2D.load("res/layabox.png");

        //为模型赋材质（单个材质可赋给多个模型）

        sphere.meshRender.material = material;

        box.meshRender.material = material;

        



    }

}

new LayaAir3D();