potree-sdk/src/custom/potree.shim.js

 
import * as THREE from "../../libs/three.js/build/three.module.js";
import {config, settings} from "./settings.js";
import math from "./utils/math.js";
import browser from "./utils/browser.js"; 
import cameraLight from "./utils/cameraLight.js";
import {Utils} from "../utils.js";
import Common from "./utils/Common.js";
import {BinaryLoader} from "../loader/BinaryLoader.js";
import {Features} from "../Features.js";

import {PointAttribute,PointAttributeTypes} from "../loader/PointAttributes.js";
import {ProfileWindow} from "../viewer/profile.js";
import {XHRFactory} from "../XHRFactory.js";
import {ClipTask, ClipMethod} from "../defines.js";

import {VolumeTool} from "../utils/VolumeTool.js";
import {Box3Helper} from "../utils/Box3Helper.js";
import {KeyCodes} from "../KeyCodes.js";
import {HQSplatRenderer} from "../viewer/HQSplatRenderer.js";
import {LRU} from "../LRU.js";
import {ExtendPointCloudMaterial} from '../materials/ExtendPointCloudMaterial.js'
 
import {PointCloudOctreeGeometry, PointCloudOctreeGeometryNode} from '../PointCloudOctreeGeometry.js'
import {Shaders} from "../../build/shaders/shaders.js";  
  
import {LineSegmentsGeometry} from '../../libs/three.js/lines/LineSegmentsGeometry.js'  
import {LineGeometry} from '../../libs/three.js/lines/LineGeometry.js'  
import {ExtendView} from '../viewer/ExtendView.js'
import {ExtendScene} from '../viewer/ExtendScene.js'

 


KeyCodes.BACKSPACE = 8


//注意，这时候Potree.js中export的内容还不在Potree变量中

var texLoader = new THREE.TextureLoader()

{//defines:
    Potree.defines = {}
    Potree.defines.Buttons = {// MouseEvent.buttons
        //buttons，设置按下了鼠标哪些键，是一个3个比特位的二进制值，默认为0。1表示按下主键（通常是左键），2表示按下次要键（通常是右键），4表示按下辅助键（通常是中间的键）。
        NONE:0,//add
        
        LEFT: 0b0001,
        RIGHT: 0b0010,
        MIDDLE: 0b0100
    };
    /*  如果访问的是button, 用THREE.MOUSE来判断：
        button，设置按下了哪一个鼠标按键，默认为0。-1表示没有按键，0表示按下主键（通常是左键），1表示按下辅助键（通常是中间的键），2表示按下次要键（通常是右键）
     */
         
    Potree.browser = browser

    /////////// add ////////////////////////////////// 
    /* Potree.defines.GLCubeFaces = {
        GL_TEXTURE_CUBE_MAP_POSITIVE_X: 0,
        GL_TEXTURE_CUBE_MAP_NEGATIVE_X: 1,
        GL_TEXTURE_CUBE_MAP_POSITIVE_Y: 2,
        GL_TEXTURE_CUBE_MAP_NEGATIVE_Y: 3,
        GL_TEXTURE_CUBE_MAP_POSITIVE_Z: 4,
        GL_TEXTURE_CUBE_MAP_NEGATIVE_Z: 5
    }; 


    Potree.defines.PanoSizeClass = {
        BASE: 1,
        STANDARD: 2,
        HIGH: 3,
        ULTRAHIGH: 4
    };

    

    Potree.defines.TileDownloaderEvents = {
        TileDownloadSuccess: "tiledownloader.download.success",
        TileDownloadFailure: "tiledownloader.download.failure",
        PanoDownloadComplete: "tiledownloader.pano.download.complete"
    };*/
    Potree.defines.PanoRendererEvents = {
        PanoRenderComplete: "panorama.render.complete",
        TileRenderFailure: "panorama.tile.render.failed",
        TileRenderSuccess: "panorama.tile.render.success",
        TileUploadAttempted: "panorama.tile.upload.attempted",
        UploadAttemptedForAllTiles: "panorama.upload.attempted.all.tiles",
        ZoomLevelRenderStarted: "panorama.zoom.render.started"
    };

    Potree.defines.SceneRendererEvents = {
        ContextCreated: "scene-renderer-context-created",
        AfterRender: "after-render",
        MemoryUsageUpdated: "scene-renderer-memory-usage-updated"
    };

    Potree.defines.Vectors = {
        UP: new THREE.Vector3(0,1,0),
        DOWN: new THREE.Vector3(0,-1,0),
        LEFT: new THREE.Vector3(-1,0,0),
        RIGHT: new THREE.Vector3(1,0,0),
        FORWARD: new THREE.Vector3(0,0,-1),
        BACK: new THREE.Vector3(0,0,1)
    };
    /* var Vectors2 = {}
    for(var i in Vectors){
        Vectors2[i] = math.convertVector.YupToZup(Vectors[i])  
    }
     */


    Potree.defines.DownloadStatus = Object.freeze({
        None: 0,
        Queued: 1,
        ForceQueued: 2,
        Downloading: 3,
        Downloaded: 4,
        DownloadFailed: 5
    });
    Potree.defines.ModelManagerEvents = {
        ModelAdded: "model-added",
        ActiveModelChanged: "active-model-changed"
    };

    Potree.defines.PanoramaEvents = {

        Enter: 'panorama.enter',
        Exit: 'panorama.exit',

        LoadComplete: "panorama.load.complete",
        LoadFailed: "panorama.load.failed",
        TileLoaded: "panorama.tile.loaded",
        VideoRendered: "panorama.video.rendered"
    };
 
    ClipTask.SHOW_INSIDE_Big = 4 
}



{//Features
    let gl_
    Features.EXT_DEPTH = { 
        isSupported: function (gl) { 
        
            gl = gl || gl_
            gl_ = gl
            if(browser.detectIOS()){
                let {major,minor,patch} = browser.iosVersion()
                if(major == 15 && minor == 4 && patch == 1){
                    console.warn('检测到是ios15.4.1, 关闭EXT_frag_depth')//该版本ext_depth有问题,导致clear错乱。没有解决办法先关闭。
                    return false
                }
            }

            return (typeof WebGL2RenderingContext != 'undefined' && gl instanceof WebGL2RenderingContext) || gl.getExtension('EXT_frag_depth'); //shader中的GL_EXT_frag_depth需要判断一下detectIOS吗。。
        }
    } 
    
}



Utils.loadSkybox = function(path, oldSky ) {
    let  camera, scene, parent , cameraOrtho
    if(!oldSky){
        parent = new THREE.Object3D("skybox_root");

        camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 100000);
        cameraOrtho = new THREE.OrthographicCamera(-1, 1, 1, -1, Potree.config.view.near, Potree.settings.cameraFar);
        if(!window.axisYup)  camera.up.set(0, 0, 1);//add
        scene = new THREE.Scene();
        
        let skyboxBgWidth = Potree.config.skyboxBgWidth
        let skyGeometry = new THREE.BoxBufferGeometry(skyboxBgWidth,skyboxBgWidth,skyboxBgWidth) 
        let skybox = new THREE.Mesh(skyGeometry, new THREE.ShaderMaterial({
            vertexShader: Shaders['skybox.vs'],   
            fragmentShader: Shaders['skybox.fs'],  
            side: THREE.BackSide,           
            uniforms:{
                tDiffuse: {
                    type: "t",
                    value: null
                },
                matrix:{
                    type: "m4",
                    value: new THREE.Matrix4
                } 
            },
            depthTest:false,
            depthWrite:false
        }) );

        scene.add(skybox);

        scene.traverse(n => n.frustumCulled = false);

        // z up
        //scene.rotation.x = Math.PI / 2;

        parent.children.push(camera);
        camera.parent = parent;
            
    }else{
        camera = oldSky.camera, 
        scene = oldSky.scene
        parent = oldSky.parent
        cameraOrtho = oldSky.cameraOrtho
    }
    
    let texture = texLoader.load( path, ()=>{
        console.log('loadSkybox成功',path) 
        texture.wrapS = THREE.RepeatWrapping;
        texture.flipY = false 
        texture.magFilter = THREE.LinearFilter
        texture.minFilter = THREE.LinearFilter
        scene.children[0].material.uniforms.tDiffuse.value = texture  
        viewer.dispatchEvent('content_changed')
    },null,(e)=>{//error
        console.error('loadSkybox失败',path) 
    });
    

    return {camera, scene, parent, cameraOrtho};
};



  

Utils.getMousePointCloudIntersection = function(viewport, mouse, pointer, camera, viewer, pointclouds, pickParams = {} ) {
    //getIntersectByDepthTex
    /* let result = viewer.edlRenderer.depthTexSampler.sample(viewport, mouse)//add
    if(result != 'unsupport')return result
      */
    
    
    
    if(!pointclouds || pointclouds.length == 0)return
    //console.log('getMousePointCloudIntersection')
    let renderer = viewer.renderer;
    
    
    
    
    if(viewport){ //转换到类似整个画面时
        /*let mouseInViewport = Utils.convertNDCToScreenPosition(pointer, null, viewport.resolution.x, viewport.resolution.y)
        pickParams.x = mouseInViewport.x   //mouse.x / viewport.width;
        pickParams.y = mouseInViewport.y //renderer.domElement.clientHeight - mouse.y / viewport.height;  */
        pickParams.x = mouse.x;
        pickParams.y = viewport.resolution.y - mouse.y;
    }else{ 
        pickParams.x = mouse.x;
        pickParams.y = renderer.domElement.clientHeight - mouse.y; 
    } 
     
    //console.log('getMousePointCloudIntersection')
      
    /* if(!raycaster){
        raycaster = new THREE.Raycaster();
        raycaster.setFromCamera(pointer, camera); 
    }  */
    
    let raycaster = new THREE.Raycaster();
    raycaster.setFromCamera(pointer, camera); 
    let ray = raycaster.ray;
    
    let selectedPointcloud = null;
    let closestDistance = Infinity;
    let closestIntersection = null;
    let closestPoint = null;
    
    
    
    //-----------add--------------------
    let old_clipBoxes_in = new Map()  
    let old_clipBoxes_out = new Map()  
    let old_bigClipInBox = new Map()  
    let old_highlightBoxes = new Map()   
    
    //bigClipInBox 最好也写下 
    let density
    let sizeType
    let size = new Map()  
    let visiMap = new Map()
    let needsUpdate = false;
    
    if(pickParams.isMeasuring || Potree.settings.displayMode == 'showPanos') { //（无深度图） 测量或全景模式提高精准度，因为漫游的
        density = Potree.settings.pointDensity 
        Potree.settings.pointDensity = 'magnifier' 
        
        pointclouds.forEach(e=>{//因为全景模式的pointSizeType是fixed所以要还原下
            visiMap.set(e,e.visible)
            e.visible = Potree.Utils.getObjVisiByReason(e, 'datasetSelection'); //先将隐藏的点云显示
            if(!e.visible)return
             
            
            size.set(e, e.temp.pointSize)    
            sizeType = e.material.pointSizeType  
            e.material.pointSizeType = Potree.config.material.pointSizeType 
             
            e.changePointSize(Potree.config.material.realPointSize*2, true)//更改点云大小到能铺满为止，否则容易识别不到
        }) 
        needsUpdate = true
    }else{ 
        if(viewer.viewports.filter(e=>!e.noPointcloud && e.active).length>1 || pickParams.cameraChanged){//在pick时相机和渲染时不一样的话 
            viewport.beforeRender && viewport.beforeRender()
            needsUpdate = true //不updatePointClouds的话hover久了会不准 因node是错的
            //但依旧需要camera真的移动到那个位置才能加载出点云
        } 
    }
    
    if(!pickParams.pickClipped){// 无视clipBoxes
        for(let pointcloud of pointclouds){  
            old_clipBoxes_in.set(pointcloud, pointcloud.clipBoxes_in)
            old_clipBoxes_out.set(pointcloud, pointcloud.clipBoxes_in)
            old_bigClipInBox.set(pointcloud, pointcloud.bigClipInBox)
            old_highlightBoxes.set(pointcloud, pointcloud.highlightBoxes)
            pointcloud.material.setClipBoxes(null, [],[],[])  
        }
        needsUpdate = true
    }
    
    if(needsUpdate){
        Potree.updatePointClouds(pointclouds,  camera, viewport.resolution );  //最好只更新pick的范围的resolution
    }
    //------------------------------------------------
    
    
    let allPointclouds = [] 
    for(let pointcloud of pointclouds){ 
        
        let point = pointcloud.pick(viewer, viewport, camera, ray, pickParams );
        
      
        
        if(!point){
            continue;
        }
        allPointclouds.push(pointcloud)
        
        
        let distance = camera.position.distanceTo(point.position);

        if (distance < closestDistance) {
            closestDistance = distance;
            selectedPointcloud = pointcloud;
            closestIntersection = point.position;
            closestPoint = point;
        }
    }

    //恢复
    if(pickParams.isMeasuring || Potree.settings.displayMode == 'showPanos'){
        Potree.settings.pointDensity = density
        
        pointclouds.forEach(e=>{
            if(e.visible){
                e.material.pointSizeType = sizeType
                e.changePointSize(size.get(e))
            }
            e.visible = visiMap.get(e)  
        })
    }else{ 
        /* if(viewer.viewports.filter(e=>!e.noPointcloud).length>1){
            viewport.afterRender && viewport.afterRender() 
        } */
    }
    if(!pickParams.pickClipped){//add  
        for(let pointcloud of pointclouds){  
            pointcloud.material.setClipBoxes(old_bigClipInBox.get(pointcloud), old_clipBoxes_in.get(pointcloud), old_clipBoxes_out.get(pointcloud), old_highlightBoxes.get(pointcloud))  
        } 
    }

    if (selectedPointcloud) {
        return {
            location: closestIntersection,
            distance: closestDistance,
            pointcloud: selectedPointcloud,
            point: closestPoint,
            pointclouds: allPointclouds, //add 
            normal: new THREE.Vector3().fromArray(closestPoint.normal )//add
        };
    } else {
        return null;
    }
    
};

Utils.pixelsArrayToDataUrl = function(pixels, width, height, compressRatio = 0.7) {
    let canvas = document.createElement('canvas');
    canvas.width = width;
    canvas.height = height;

    let context = canvas.getContext('2d');

    pixels = new pixels.constructor(pixels);

    /* for (let i = 0; i < pixels.length; i++) {
        pixels[i * 4 + 3] = 255;
    } */ 
    // flip vertically
    let bytesPerLine = width * 4;
    for(let i = 0; i < parseInt(height / 2); i++){
        let j = height - i - 1;

        let lineI = pixels.slice(i * bytesPerLine, i * bytesPerLine + bytesPerLine);
        let lineJ = pixels.slice(j * bytesPerLine, j * bytesPerLine + bytesPerLine);
        pixels.set(lineJ, i * bytesPerLine);
        pixels.set(lineI, j * bytesPerLine);
    }
    
    
    
    let imageData = context.createImageData(width, height);
    imageData.data.set(pixels);
    context.putImageData(imageData, 0, 0);

    let dataURL = canvas.toDataURL(compressRatio);

    return dataURL;
}

Utils.renderTargetToDataUrl = function(renderTarget, width, height, renderer, compressRatio = 0.7){
    let pixelCount = width * height;
    let buffer = new Uint8Array(4 * pixelCount);

    renderer.readRenderTargetPixels(renderTarget, 0, 0, width, height, buffer);
    var dataUrl = Utils.pixelsArrayToDataUrl(buffer, width, height, compressRatio)
    return dataUrl
    
} 

Utils.mouseToRay = function(pointer, camera  ){
 
    let vector = new THREE.Vector3(pointer.x, pointer.y, 1); 
    let origin = new THREE.Vector3(pointer.x, pointer.y, -1); //不能用camera.position，在orbitCamera时不准
    vector.unproject(camera);
    origin.unproject(camera);
    let direction = new THREE.Vector3().subVectors(vector, origin).normalize();

    let ray = new THREE.Ray(origin, direction);

    return ray;
}
Utils.getPos2d = function(point, viewport , dom  ){//获取一个三维坐标对应屏幕中的二维坐标
    var pos
    if(math.closeTo(viewport.camera.position, point, 1e-5) ){ //和相机位置重合时显示会四处飘,看是要改成一直显示中间还是隐藏？
        pos = new THREE.Vector3(0,0,1.5); //1.5是为了不可见
    }else{ 
        pos = point.clone().project(viewport.camera)	//比之前hotspot的计算方式写得简单  project用于3转2(求法同shader)； unproject用于2转3 :new r.Vector3(e.x, e.y, -1).unproject(this.camera);
    }
    
    
    var x,y,left,top;
    x = (pos.x + 1) / 2 * dom.clientWidth * viewport.width;
    y = (1 - (pos.y + 1) / 2) * dom.clientHeight * viewport.height; 
    left = viewport.left * dom.clientWidth;
    top = (1- viewport.bottom - viewport.height) * dom.clientHeight;
     

    var inSight = pos.x <= 1 &&  pos.x >= -1    //是否在屏幕中   
                && pos.x <= 1 &&  pos.y >= -1 
 

    return {
        pos:  new THREE.Vector2(left+x,top+y) ,// 屏幕像素坐标
        vector:  pos,   //（范围 -1 ~ 1）
        trueSide : pos.z<1, //trueSide为false时，即使在屏幕范围内可见，也是反方向的另一个不可以被渲染的点   参见Tag.update
        inSight : inSight,	//在屏幕范围内可见,
        posInViewport: new THREE.Vector2(x,y)
    };
} 

Utils.screenPass = new function () {
	this.screenScene = new THREE.Scene();
	this.screenQuad = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2, 1));
	this.screenQuad.material.depthTest = true;
	this.screenQuad.material.depthWrite = true;
	this.screenQuad.material.transparent = true;
	this.screenScene.add(this.screenQuad);
	this.camera = new THREE.Camera();

	this.render = function (renderer, material, target, composer) {
		this.screenQuad.material = material;
          
		if (typeof target === 'undefined') {
			(composer || renderer).render(this.screenScene, this.camera);
		} else {
            let oldTarget = renderer.getRenderTarget()
            renderer.setRenderTarget(target);
            //renderer.clear();   //有时候不能clear,如renderBG后再
			(composer || renderer).render(this.screenScene, this.camera);
            renderer.setRenderTarget(oldTarget)  
		}
	};
}();

//add 
Utils.computePointcloudsBound = function(pointclouds){
    var boundingBox = new THREE.Box3();
    pointclouds.forEach(pointcloud=>{
        pointcloud.updateBound()
        boundingBox.union(pointcloud.bound2)
    })
    var boundSize = boundingBox.getSize(new THREE.Vector3)
    var center = boundingBox.getCenter(new THREE.Vector3)
    return {boundSize, center, boundingBox}
}

Utils.convertScreenPositionToNDC = function(pointer, mouse, width, height) { 
    return pointer = pointer || new THREE.Vector2,
        pointer.x = mouse.x / width * 2 - 1,
        pointer.y = 2 * -(mouse.y / height) + 1,
        pointer 
}

Utils.convertNDCToScreenPosition = function(pointer, mouse, width, height) { 
    return mouse = mouse || new THREE.Vector2,
        mouse.x = Math.round((pointer.x + 1 ) / 2 * width),
        mouse.y = Math.round(-(pointer.y - 1 ) / 2 * height),
        mouse 
}

Utils.getOrthoCameraMoveVec = function(pointerDelta, camera ){//获取当camera为Ortho型时 屏幕点1 到 屏幕点2 的三维距离
     
    let cameraViewWidth = camera.right / camera.zoom  
    let cameraViewHeight = camera.top / camera.zoom
    let moveVec = new THREE.Vector3; 
    moveVec.set( pointerDelta.x * cameraViewWidth  , pointerDelta.y * cameraViewHeight  , 0).applyQuaternion(camera.quaternion)  
    return moveVec              
}

Utils.VectorFactory = {
    fromArray : function(t) {
        if (t) {
            if (t.length < 2 || t.length > 3)
                console.error("Wrong number of ordinates for a point!");
            return 3 === t.length ? (new THREE.Vector3).fromArray(t) : (new THREE.Vector2).fromArray(t)
        }
    },
    fromArray3 : function(t) {
        if (t) {
            if (3 !== t.length)
                console.error("Wrong number of ordinates for a point!");
            return (new THREE.Vector3).fromArray(t)
        }
    },
    fromArray2 : function(t) {
        if (t) {
            if (2 !== t.length)
                console.error("Wrong number of ordinates for a point!");
            return (new THREE.Vector2).fromArray(t)
        }
    },
    toString : function(t) {
        return t.x.toFixed(8) + "," + t.y.toFixed(8) + "," + t.z.toFixed(3)
    }

}
 
Utils.QuaternionFactory = {
    rot90 : (new THREE.Quaternion).setFromAxisAngle(new THREE.Vector3(0,0,1), THREE.Math.degToRad(-90)),
    fromArray : function(t) {
        if (t) {
            if (4 !== t.length)
                console.error("Wrong number of ordinates for a quaternion!");
            return new THREE.Quaternion(t[1],t[2],t[3],t[0]).multiply(this.rot90)
        }
    }
    ,
    toArray : function(t) {
        if (t) {
            var e = t.clone().multiply(a).toArray();
            return [e[3], e[0], e[1], e[2]]
        }
    }
    ,
    fromLonLat : function(t) {
        if (t)
            return (new THREE.Quaternion).setFromEuler(new THREE.Euler(t.lon,t.lat,0))
    }
    ,
    toLonLat : function(t) {
        if (t) {
            var e = (new THREE.Euler).setFromQuaternion(t);
            return {
                lon: e.x,
                lat: e.y
            }
        }
    }
    
    
}
 
Utils.datasetPosTransform = function(o={}){  
 
    let pointcloud = o.pointcloud || viewer.scene.pointclouds.find(e=>e.dataset_id == o.datasetId)
    let tranMatrix 
    if(pointcloud){ 
        if(Potree.settings.editType == 'merge'){
            tranMatrix = o.fromDataset ? pointcloud.matrixWorld : new THREE.Matrix4().copy(pointcloud.matrixWorld).invert() 
        }else{
            tranMatrix = o.fromDataset ? pointcloud.transformMatrix : pointcloud.transformInvMatrix 
        }
    }else{ 
        if(Potree.settings.intersectOnObjs){
            let object = o.object || viewer.objs.children.find(e=>e.dataset_id == o.datasetId)
            if(object){
                tranMatrix = o.fromDataset ? object.matrixWorld : new THREE.Matrix4().copy(object.matrixWorld).invert() 
            }  
        } 
    } 
    if(tranMatrix){
        return (new THREE.Vector3).copy(o.position).applyMatrix4(tranMatrix)
    }else{
        if(o.datasetId != void 0){
            console.error(`datasetPosTransform找不到datasetId为${o.datasetId}的数据集或模型，请检查数据， 模型未创建或删除`)
            //很可能是旧的热点，需要删除
        }
    }
    
}

Utils.datasetRotTransform = function(o={}){
    let pointcloud = o.pointcloud || viewer.scene.pointclouds.find(e=>e.dataset_id == o.datasetId)
    if(pointcloud){
        var matrix, newMatrix, result
        
        if(o.rotation){
            matrix = new THREE.Matrix4().makeRotationFromEuler(o.rotation)
        }else if(o.quaternion){
            matrix = new THREE.Matrix4().makeRotationFromQuaternion(o.quaternion) 
        }else if(o.matrix){
            matrix = o.matrix.clone()
        }else{
            return
        } 
        let rotateMatrix = o.fromDataset ? pointcloud.rotateMatrix : pointcloud.rotateInvMatrix
        newMatrix = new THREE.Matrix4().multiplyMatrices(rotateMatrix, matrix  ) 
         
        if(o.getRotation){
            result = new THREE.Euler().setFromRotationMatrix(newMatrix)
        }else if(o.getQuaternion){
            result = new THREE.Quaternion().setFromRotationMatrix(newMatrix)
        }else if(o.getMatrix){
            result = newMatrix
        }
        
        return result
        
    }

    
}

Utils.isInsideFrustum = function(bounding, camera){// bounding是否在视野范围内有可见部分（视野就是一个锥状box）
    let frustumMatrix = new THREE.Matrix4
    frustumMatrix.multiplyMatrices(camera.projectionMatrix, camera.matrixWorldInverse)
    
    let frustum = new THREE.Frustum();
    frustum.setFromProjectionMatrix(frustumMatrix) 
     
    if(bounding instanceof THREE.Sphere){
        return frustum.intersectsSphere(bounding)  
    }else{
        return frustum.intersectsBox(bounding)  
    }
}

Utils.isIntersectBox = function(object,  boxMatrix){//object是否有在box中的部分。 object可以是点或者bounding, box原为1*1*1，但可能形变
    //let frustum = new THREE.Frustum();
    //frustum.setFromProjectionMatrix(boxMatrixInverse) --错
     
    let px = new THREE.Vector3(+0.5, 0, 0).applyMatrix4(boxMatrix);
    let nx = new THREE.Vector3(-0.5, 0, 0).applyMatrix4(boxMatrix);
    let py = new THREE.Vector3(0, +0.5, 0).applyMatrix4(boxMatrix);
    let ny = new THREE.Vector3(0, -0.5, 0).applyMatrix4(boxMatrix);
    let pz = new THREE.Vector3(0, 0, +0.5).applyMatrix4(boxMatrix);
    let nz = new THREE.Vector3(0, 0, -0.5).applyMatrix4(boxMatrix);

    let pxN = new THREE.Vector3().subVectors(nx, px).normalize();
    let nxN = pxN.clone().multiplyScalar(-1);
    let pyN = new THREE.Vector3().subVectors(ny, py).normalize();
    let nyN = pyN.clone().multiplyScalar(-1);
    let pzN = new THREE.Vector3().subVectors(nz, pz).normalize();
    let nzN = pzN.clone().multiplyScalar(-1);

    let pxPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pxN, px);
    let nxPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nxN, nx);
    let pyPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pyN, py);
    let nyPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nyN, ny);
    let pzPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pzN, pz);
    let nzPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nzN, nz);
    let frustum = new THREE.Frustum(pxPlane, nxPlane, pyPlane, nyPlane, pzPlane, nzPlane);
   
    
    
     
    if(object instanceof THREE.Box3){
        var boxBound = new THREE.Box3(
            new THREE.Vector3(-0.5,-0.5,-0.5), new THREE.Vector3(0.5,0.5,0.5),
        ).applyMatrix4(boxMatrix)    //large boundingbox
        if(!object.intersectsBox(boxBound))return
        return frustum.intersectsBox(object)  //根据该函数， 若存在某个plane在box上的对应点都在plane背面，则不相交.  可得知在box构成的frustum倾斜时不准确，不相交也判断为相交，甚至不如bound相交准确。所以前面加步骤排除下，但仍不完全准确。（可在裁剪中将box放置到数据集上方旋转下校验）
    }else if(object instanceof Array){//点合集， 只能粗略计算下
        let sphere = new THREE.Sphere()
        sphere.setFromPoints(object) 
        return this.isIntersectBox(sphere, boxMatrix) 
    }else if(object instanceof THREE.Sphere){
        return frustum.intersectsSphere(object)  
    }else if(object instanceof THREE.Vector3){
        return frustum.containsPoint(object)  
    }else if(object instanceof THREE.Matrix4){//第一个参数如果和第二个参数一样都是box的worldMatrix
        
    }

    /* containsPoint: ƒ containsPoint( point ) 
    intersectsBox: ƒ intersectsBox( box )
    intersectsObject: ƒ intersectsObject( object )//geo
    intersectsSphere: ƒ intersectsSphere( sphere )
    intersectsSprite: ƒ intersectsSprite( sprite )
     */

} 

Utils.getIntersect = function (camera, meshes, pointer, raycaster) {
    //获取鼠标和meshes交点
    
    if(!raycaster){//getMouseIntersect
        camera.updateMatrixWorld()
        raycaster = new THREE.Raycaster()
        var origin = new THREE.Vector3(pointer.x, pointer.y, -1).unproject(camera),
        end = new THREE.Vector3(pointer.x, pointer.y, 1).unproject(camera)
        var dir = end.sub(origin).normalize()
        raycaster.set(origin, dir)
    } 
    
    meshes.forEach(e=>{ 
        raycaster.layers.enable(math.getBaseLog(2,e.layers.mask)) 
    }) 
    var n = raycaster.intersectObjects(meshes)
    if (0 === n.length) return null
    return n[0]
} 




Utils.addOrRemoveDefine = function(material, defineName, type, value=''){ 
    let defines = material.defines
    if(type == 'add'){
        if(defines[defineName] != void 0 && defines[defineName] == value)return
        defines[defineName] = value
    }else{
        if(defines[defineName] != void 0)return;
        delete defines[defineName] 
    }
    material.needsUpdate = true;
} 

Utils.makeTexDontResize = function(map){//避免贴图因非2的次方而缩小。小心使用
    if(!map || !map.image){  
        return console.log('!map || !map.image', map, map&&map.image)
    } 
    if(THREE.Math.isPowerOfTwo(map.image.width ) && THREE.Math.isPowerOfTwo(map.image.height ))return
    map.wrapS = map.wrapT = THREE.ClampToEdgeWrapping; //原默认 RepeatWrapping 
    map.minFilter = THREE.LinearFilter; // or THREE.NearestFilter  原默认 LinearMipmapLinearFilter
    map.needsUpdate = true
} 


Utils.updateVisible = function(object, reason, ifShow, level=0, type){//当所有加入的条件都不为false时才显示. reason='force'一般是强制、临时的
    if(!object.unvisibleReasons) object.unvisibleReasons = []; //如果length>0代表不可见
    if(!object.visibleReasons) object.visibleReasons = []; //在同级时，优先可见
    
    
    var update = function(){
        
        //先按从高到低的level排列
        object.unvisibleReasons = object.unvisibleReasons.sort((a,b)=>b.level-a.level)
        object.visibleReasons = object.visibleReasons.sort((a,b)=>b.level-a.level)
        var maxVisiLevel = object.visibleReasons[0] ? object.visibleReasons[0].level : -1
        var maxunVisiLevel = object.unvisibleReasons[0] ? object.unvisibleReasons[0].level : -1
        
        var shouldVisi = maxVisiLevel >= maxunVisiLevel
        var visiBefore = object.visible
        
        
        if(visiBefore != shouldVisi){
            object.visible = shouldVisi
            object.dispatchEvent({
                type: 'isVisible',
                visible: shouldVisi,
                reason,
            })  
        } 
    }    
    
    
    
    if(ifShow){ 

        var index = object.unvisibleReasons.findIndex(e=>e.reason == reason) 
        if(index > -1){
            type = 'cancel'
            object.unvisibleReasons.splice(index, 1); 
        }
        
        if(type == 'add' ){
            if(!object.visibleReasons.some(e=>e.reason == reason)){
                object.visibleReasons.push({reason,level})
            }
        } 
    }else{ 
        var index = object.visibleReasons.findIndex(e=>e.reason == reason) 
        if(index > -1){
            type = 'cancel'
            object.visibleReasons.splice(index, 1); 
        }
        
        if(type != 'cancel' ){
            if(!object.unvisibleReasons.some(e=>e.reason == reason)){
                object.unvisibleReasons.push({reason,level})
            }
        }
    }
     
    update() 
    
} 
/* 
    复杂案例： 如果物体默认隐藏， 当符合任何一个其他条件时可见，则可:
    Potree.Utils.updateVisible(this, "default", false, 0 ) //默认隐藏    
    Potree.Utils.updateVisible(this, 条件名,  ifShow, 1, ifShow?'add':'cancel' ) //其他的条件
*/ 

Utils.getObjVisiByReason = function(object,reason){//获取在某条件下是否可见.  注： 用户在数据集选择可不可见为"datasetSelection"
    if(object.visible)return true
    else{
        return !object.unvisibleReasons || !object.unvisibleReasons.some(e=>e.reason == reason)  
    }
} 
 


Utils.setCameraLayers = function(camera, enableLayers, extraEnableLayers=[]){//add
    camera.layers.disableAll() 
    enableLayers.concat(extraEnableLayers).forEach(e=>{
        let layer = Potree.config.renderLayers[e]
        if(layer == void 0){
            console.error('setCameraLayer没找到layer!');
            return 
        }
        camera.layers.enable(layer)
    })
}
Utils.setObjectLayers = function(object, layerName){//add
    let layer = Potree.config.renderLayers[layerName]
    if(layer == void 0){
        console.error('setCameraLayer没找到layer!');
        return 
    }
    object.traverse(e=>{ 
        e.layers.set(layer)
    })
}











BinaryLoader.prototype.load = function(node, callback){//解析点云
    if (node.loaded) {
        return;
    }

    let url = node.getURL();

    if (this.version.equalOrHigher('1.4')) {
        url += '.bin';
    }
    //url += '?m='+node.pcoGeometry.timeStamp //add
    
    
    let startLoad = (url)=>{
        let xhr = XHRFactory.createXMLHttpRequest();
        xhr.open('GET', url, true);
        xhr.responseType = 'arraybuffer';
        xhr.overrideMimeType('text/plain; charset=x-user-defined');
        xhr.onreadystatechange = () => {
            if (xhr.readyState === 4) {
                if((xhr.status === 200 || xhr.status === 0) &&  xhr.response !== null){
                    let buffer = xhr.response;
                    this.parse(node, buffer, callback); 
                } else {
                    //console.error(`Failed to load file! HTTP status: ${xhr.status}, file: ${url}`);
                    throw new Error(`Failed to load file! HTTP status: ${xhr.status}, file: ${url}`);
                }
            }
        };
        
        try {
            xhr.send(null);
        } catch (e) {
            console.log('fehler beim laden der punktwolke: ' + e);
        }
    }  
    
     
    Potree.getRealUrl(url, startLoad)
    
}

PointAttribute.RGBA_PACKED = new PointAttribute("rgba", PointAttributeTypes.DATA_TYPE_INT8, 4);
PointAttribute.COLOR_PACKED = PointAttribute.RGBA_PACKED;
PointAttribute.INTENSITY = new PointAttribute("intensity", PointAttributeTypes.DATA_TYPE_UINT16, 1); 
PointAttribute.CLASSIFICATION = new PointAttribute("classification", PointAttributeTypes.DATA_TYPE_UINT8, 1); 
PointAttribute.GPS_TIME = new PointAttribute("gps-time", PointAttributeTypes.DATA_TYPE_DOUBLE, 1);

ProfileWindow.prototype.initTHREE = function(){
    this.renderer = new THREE.WebGLRenderer({alpha: true, premultipliedAlpha: false});
    this.renderer.setClearColor(0x000000, 0);
    this.renderer.setSize(10, 10);
    this.renderer.autoClear = false;
    this.renderArea.append($(this.renderer.domElement));
    this.renderer.domElement.tabIndex = '2222';
    $(this.renderer.domElement).css('width', '100%');
    $(this.renderer.domElement).css('height', '100%');


    {
        let gl = this.renderer.getContext();

        if(gl.createVertexArray == null){
            let extVAO = gl.getExtension('OES_vertex_array_object');

            if(!extVAO){
                throw new Error("OES_vertex_array_object extension not supported");
            }

            gl.createVertexArray = extVAO.createVertexArrayOES.bind(extVAO);
            gl.bindVertexArray = extVAO.bindVertexArrayOES.bind(extVAO);
        }
        
    }

    this.camera = new THREE.OrthographicCamera(-1000, 1000, 1000, -1000, -1000, 1000);
    this.camera.up.set(0, 0, 1);
    this.camera.rotation.order = "ZXY";
    this.camera.rotation.x = Math.PI / 2.0;


    this.scene = new THREE.Scene();
    this.profileScene = new THREE.Scene();

    let sg = new THREE.SphereGeometry(1, 16, 16);
    let sm = new THREE.MeshNormalMaterial();
    this.pickSphere = new THREE.Mesh(sg, sm);
    this.scene.add(this.pickSphere);

    this.viewerPickSphere = new THREE.Mesh(sg, sm);
}

//Potree_update_visibility
Potree.updatePointClouds =  function(pointclouds,camera, areaSize  ){
    viewer.addTimeMark('updateClouds','start')
    
   
	for (let pointcloud of pointclouds) {
		let start = performance.now();

		for (let profileRequest of pointcloud.profileRequests) {
			profileRequest.update();

			let duration = performance.now() - start;
			if(duration > 5){
				break;
			}
		}

		let duration = performance.now() - start;
	}
    
    
	let result = Potree.updateVisibility(pointclouds, camera, areaSize  );

	for (let pointcloud of pointclouds) { 
		//pointcloud.updateMaterial(pointcloud.material, pointcloud.visibleNodes, camera, renderer);//转移到渲染时
		pointcloud.updateVisibleBounds();
	}

	Potree.lru.freeMemory();//即Potree.lru 能看到所有在加载的node
    
    viewer.addTimeMark('updateClouds','end')

	return result;
};

 
Potree.updateVisibilityStructures = function(pointclouds, camera, areaSize) {
	let frustums = {};
	let camObjPositions = {}
    let camObjDirs = {} //add
	let priorityQueue = new BinaryHeap(function (x) { return 1 / x.weight; });//二叉堆。

                
    viewer.addTimeMark('visiStructure','start')

    //camera.updateMatrixWorld();
    let viewI = camera.matrixWorldInverse;
    let proj = camera.projectionMatrix; 
    let view = camera.matrixWorld;
    let projViewI = new THREE.Matrix4().multiply(proj).multiply(viewI)
    
    /* let list = pointclouds  // stopWhenAllUsed = !viewer.lastFrameChanged
    let min = 5, max = Math.max(20 , Math.round(list.length / 10 )) 
    let result = Common.batchHandling.getSlice('pcGetFrustum', list, {  min,max, durBound1: 3, durBound2: 10} ) //iphonex稳定后大概在7-10。  
     */
    
    
    
	for (let i = 0; i < pointclouds.length; i++) {
		let pointcloud = pointclouds[i];

		if (!pointcloud.initialized()) {
			continue;
		}
         
      /*   let info = history.get(pointcloud)
        if() */
        
        
		pointcloud.numVisibleNodes = 0;
		pointcloud.numVisiblePoints = 0;
		pointcloud.deepestVisibleLevel = 0;
		pointcloud.visibleNodes = [];
		pointcloud.visibleGeometry = [];


        // 因漫游模式而隐藏的话 依旧需要加入visibleNodes,因为pick需要
        /* if (pointcloud.visible && pointcloud.root !== null) {
			priorityQueue.push({pointcloud: i, node: pointcloud.root, weight: Number.MAX_VALUE});
		}  */    
       
		if (pointcloud.visible || /* !pointcloud.hasDepthTex && */ pointcloud.unvisibleReasons && pointcloud.unvisibleReasons.length == 1 && pointcloud.unvisibleReasons[0].reason == 'displayMode'   &&  pointcloud.root !== null) {//改 visible -> 
            priorityQueue.push({pointcloud: i, node: pointcloud.root, weight: Number.MAX_VALUE});
        }else{
            continue
        }            
       
      
        // frustum in object space
		
		let frustum = new THREE.Frustum();
		
		let world = pointcloud.matrixWorld;
		
		// use close near plane for frustum intersection
		/* let frustumCam = camera.clone();
        frustumCam.zoom = camera.zoom //add
		frustumCam.near = Math.min(camera.near, 0.1);
		frustumCam.updateProjectionMatrix(); */ //----没用到frustumCam，删了
        

		let fm = new THREE.Matrix4().multiply(projViewI).multiply(world);
		frustum.setFromProjectionMatrix(fm);
		frustums[i] =  frustum  //frustums.push(frustum);

		// camera position in object space
		
		let worldI = pointcloud.matrixWorldInverse
		let camMatrixObject = new THREE.Matrix4().multiply(worldI).multiply(view);//假设点云无变换的话，相机相对于点云的变换矩阵
		let camObjPos = new THREE.Vector3().setFromMatrixPosition(camMatrixObject);
		camObjPositions[i] = camObjPos//camObjPositions.push(camObjPos);
  
        let quaternion = new THREE.Quaternion().setFromRotationMatrix(camMatrixObject)
        let camDir = (new THREE.Vector3(0,0,-1)).applyQuaternion(quaternion)
        camObjDirs[i] = camDir
        
		// hide all previously visible nodes
		// if(pointcloud.root instanceof PointCloudOctreeNode){
		//	pointcloud.hideDescendants(pointcloud.root.sceneNode);
		// }
		if (pointcloud.root.isTreeNode()) {
			pointcloud.hideDescendants(pointcloud.root.sceneNode);
		}

		for (let j = 0; j < pointcloud.boundingBoxNodes.length; j++) {
			pointcloud.boundingBoxNodes[j].visible = false;
		}
	}

    viewer.addTimeMark('visiStructure','end')
      
	return {
		'frustums': frustums,
		'camObjPositions': camObjPositions,
		'priorityQueue': priorityQueue,
        camObjDirs
	};
}; 


Potree.updateVisibility = function(pointclouds, camera, areaSize){

	let numVisibleNodes = 0;
	let numVisiblePoints = 0;

	let numVisiblePointsInPointclouds = new Map(pointclouds.map(pc => [pc, 0]));

	let visibleNodes = [];
	let visibleGeometry = [];
	let unloadedGeometry = [];

	let lowestSpacing = Infinity;

	// calculate object space frustum and cam pos and setup priority queue
	let s = Potree.updateVisibilityStructures(pointclouds, camera, areaSize);//得到相机可见范围
	let frustums = s.frustums;
	let camObjPositions = s.camObjPositions;
	let priorityQueue = s.priorityQueue;
    let camObjDirs = s.camObjDirs
    
    
    
	let loadedToGPUThisFrame = 0;
	
	let domWidth = areaSize.x; //renderer.domElement.clientWidth;
	let domHeight = areaSize.y;//renderer.domElement.clientHeight;
    let fov = (camera.fov * Math.PI) / 180;
    let slope = Math.tan(fov / 2);
    let projFactor0 = (0.5 * domHeight) / slope ;
    
    
	// check if pointcloud has been transformed
	// some code will only be executed if changes have been detected
	if(!Potree._pointcloudTransformVersion){
		Potree._pointcloudTransformVersion = new Map();
	}
	let pointcloudTransformVersion = Potree._pointcloudTransformVersion;
	for(let pointcloud of pointclouds){

		if(/* pointcloud.hasDepthTex ? !pointcloud.visible : */ !Potree.Utils.getObjVisiByReason(pointcloud, 'datasetSelection')){//改 visible ->   这一版的深度图不准，就只用在贴图里，pick时需要点云，所以要一直有， 否则但pick时显示的话visibleNodes只能加载出一点点
			continue;
		} 
        
        //if(!pointcloud.visible) continue

		pointcloud.updateMatrixWorld();

		if(!pointcloudTransformVersion.has(pointcloud)){
			pointcloudTransformVersion.set(pointcloud, {number: 0, transform: pointcloud.matrixWorld.clone()});
		}else{
			let version = pointcloudTransformVersion.get(pointcloud);

			if(!version.transform.equals(pointcloud.matrixWorld)){
				version.number++;
				version.transform.copy(pointcloud.matrixWorld);

				pointcloud.dispatchEvent({
					type: "transformation_changed",
					target: pointcloud
				});
			}
		}
	}
    
    
	while (priorityQueue.size() > 0) {
		let element = priorityQueue.pop(); //取出权重最大的一个
         
		let node = element.node;
		let parent = element.parent;
		let pointcloud = pointclouds[element.pointcloud];

		// { // restrict to certain nodes for debugging
		//	let allowedNodes = ["r", "r0", "r4"];
		//	if(!allowedNodes.includes(node.name)){
		//		continue;
		//	}
		// }

		let box = node.getBoundingBox();
		let frustum = frustums[element.pointcloud];
		let camObjPos = camObjPositions[element.pointcloud];
        if(!frustum) continue //add
        
        let camObjDir = camObjDirs[element.pointcloud];
        
        
		let insideFrustum = frustum.intersectsBox(box);
		let maxLevel = pointcloud.maxLevel == void 0 ? Infinity : pointcloud.maxLevel;
		let level = node.getLevel();
		let visible = insideFrustum;
		visible = visible && !(numVisiblePoints + node.getNumPoints() > Potree.pointBudget);
		visible = visible && !(numVisiblePointsInPointclouds.get(pointcloud) + node.getNumPoints() > pointcloud.pointBudget); // pointcloud.pointBudget一直是Infinity
		visible = visible && level <= maxLevel; //< 改为 <=
		//visible = visible || node.getLevel() <= 2; 

        let intersectBox = (clipBox)=>{

            let pcWorldInverse = pointcloud.matrixWorld.clone().invert();
            let toPCObject = pcWorldInverse.multiply(clipBox.box.matrixWorld);  //box乘上点云逆矩阵

            /* let px = new THREE.Vector3(+0.5, 0, 0).applyMatrix4(pcWorldInverse);
            let nx = new THREE.Vector3(-0.5, 0, 0).applyMatrix4(pcWorldInverse);
            let py = new THREE.Vector3(0, +0.5, 0).applyMatrix4(pcWorldInverse);
            let ny = new THREE.Vector3(0, -0.5, 0).applyMatrix4(pcWorldInverse);
            let pz = new THREE.Vector3(0, 0, +0.5).applyMatrix4(pcWorldInverse);
            let nz = new THREE.Vector3(0, 0, -0.5).applyMatrix4(pcWorldInverse);

            let pxN = new THREE.Vector3().subVectors(nx, px).normalize();
            let nxN = pxN.clone().multiplyScalar(-1);
            let pyN = new THREE.Vector3().subVectors(ny, py).normalize();
            let nyN = pyN.clone().multiplyScalar(-1);
            let pzN = new THREE.Vector3().subVectors(nz, pz).normalize();
            let nzN = pzN.clone().multiplyScalar(-1);

            let pxPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pxN, px);
            let nxPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nxN, nx);
            let pyPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pyN, py);
            let nyPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nyN, ny);
            let pzPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(pzN, pz);
            let nzPlane = new THREE.Plane().setFromNormalAndCoplanarPoint(nzN, nz);

            //if(window.debugdraw !== undefined && window.debugdraw === true && node.name === "r60"){

            //	Potree.utils.debugPlane(viewer.scene.scene, pxPlane, 1, 0xFF0000);
            //	Potree.utils.debugPlane(viewer.scene.scene, nxPlane, 1, 0x990000);
            //	Potree.utils.debugPlane(viewer.scene.scene, pyPlane, 1, 0x00FF00);
            //	Potree.utils.debugPlane(viewer.scene.scene, nyPlane, 1, 0x009900);
            //	Potree.utils.debugPlane(viewer.scene.scene, pzPlane, 1, 0x0000FF);
            //	Potree.utils.debugPlane(viewer.scene.scene, nzPlane, 1, 0x000099);

            //	Potree.utils.debugBox(viewer.scene.scene, box, new THREE.Matrix4(), 0x00FF00);
            //	Potree.utils.debugBox(viewer.scene.scene, box, pointcloud.matrixWorld, 0xFF0000);
            //	Potree.utils.debugBox(viewer.scene.scene, clipBox.box.boundingBox, clipBox.box.matrixWorld, 0xFF0000);

            //	window.debugdraw = false;
            //}

            let frustum = new THREE.Frustum(pxPlane, nxPlane, pyPlane, nyPlane, pzPlane, nzPlane);
            let intersects = frustum.intersectsBox(box); //node的bounding

             
            return !!intersects */
            
             
            return Potree.Utils.isIntersectBox(box, pcWorldInverse) 
            
            
        }

        //改 总共两种box : 可见和不可见(都是并集)
 
    
        
		let clipBoxes_in = pointcloud.material.clipBoxes_in;
		let clipBoxes_out = pointcloud.material.clipBoxes_out;
        let bigClipInBox = pointcloud.material.bigClipInBox
        
        if(visible && bigClipInBox){//不在剪裁下载的框内
            if(!intersectBox(bigClipInBox)){
                visible = false; 
            } 
        }
        
        
		if(visible && clipBoxes_in.length > 0){//当有可见box时，需要在任一可见box内才可见
            let visi = false;
            for(let i = 0, length=clipBoxes_in.length; i < length; i++){ 
                if(intersectBox(clipBoxes_in[i])){
                    visi = true;
                    break;
                } 
            }
            if(!visi){
                visible = false  
            }
        }
        
        
        //outside不做处理。因为node必须完全在clipBox内才能完全隐藏，而这里的intersect只能识别出部分在clipBox内。因而只能说明不在任意一个box内绝对可见，没有意义，这里需要找出不可见的。
        /* if(visible && clipBoxes_out.length > 0){ //当有不可见box时，不在所有不可见box内才可见
            let visi = true;
            for(let i = 0,length=clipBoxes_out.length; i < length; i++){ 
                if(intersectBox(clipBoxes_out[i])){
                    visi = false;
                    break;
                } 
            }
            if(!visi){
                visible = false  
            }
        }
        */ 

		// visible = ["r", "r0", "r06", "r060"].includes(node.name);
		// visible = ["r"].includes(node.name);

		if (node.spacing) {
			lowestSpacing = Math.min(lowestSpacing, node.spacing);
		} else if (node.geometryNode && node.geometryNode.spacing) {
			lowestSpacing = Math.min(lowestSpacing, node.geometryNode.spacing);
		}

		if (!Potree.settings.pointNoLimit && numVisiblePoints + node.getNumPoints() > Potree.pointBudget) {
            Potree.overPointBudget = true
            viewer.dispatchEvent('overPointBudget'); 
			break;
		}
        Potree.overPointBudget = false
        
        
		if (!visible) {
			continue;
		}

		// TODO: not used, same as the declaration?
		// numVisibleNodes++;
		numVisiblePoints += node.getNumPoints();
		let numVisiblePointsInPointcloud = numVisiblePointsInPointclouds.get(pointcloud);
		numVisiblePointsInPointclouds.set(pointcloud, numVisiblePointsInPointcloud + node.getNumPoints());

		pointcloud.numVisibleNodes++;
		pointcloud.numVisiblePoints += node.getNumPoints();

		if (node.isGeometryNode() && (!parent || parent.isTreeNode())) {
			if (node.isLoaded() && loadedToGPUThisFrame < 2) {
				node = pointcloud.toTreeNode(node, parent);
				loadedToGPUThisFrame++;
			} else {
                //console.log('unloadedGeometry',node)
				unloadedGeometry.push({pointcloud,node});   //加载点云。虽然还没加载，但也计入了visibleNodes,只是无children，numPoints=0
				visibleGeometry.push(node);
			}
		}

		if (node.isTreeNode()) {
			Potree.lru.touch(node.geometryNode);//在缓存中计入点云
			node.sceneNode.visible = true;
			node.sceneNode.material = pointcloud.material;

			visibleNodes.push(node);
			pointcloud.visibleNodes.push(node);

			if(node._transformVersion === undefined){
				node._transformVersion = -1;
			}
			let transformVersion = pointcloudTransformVersion.get(pointcloud);
			if(node._transformVersion !== transformVersion.number){
				node.sceneNode.updateMatrix();
				//node.sceneNode.matrixWorld.multiplyMatrices(pointcloud.matrixWorld, node.sceneNode.matrix);	
				node.sceneNode.matrixWorld.multiplyMatrices(pointcloud.matrixWorld, node.sceneNode.matrix);	
				
                node._transformVersion = transformVersion.number;
                               
			}
 
			if (pointcloud.showBoundingBox && !node.boundingBoxNode && node.getBoundingBox) { 
                let colorHue = level / (maxLevel+1)
                let s = 0.1 + level / (maxLevel+1)
                let color = (new THREE.Color()).setHSL(colorHue, s, s) 
                 
				let boxHelper = new Box3Helper(node.getBoundingBox(),color);
				boxHelper.matrixAutoUpdate = false;
				pointcloud.boundingBoxNodes.push(boxHelper);
				node.boundingBoxNode = boxHelper;
				node.boundingBoxNode.matrix.copy(pointcloud.matrixWorld);
			} else if (pointcloud.showBoundingBox) {
				node.boundingBoxNode.visible = true;
				node.boundingBoxNode.matrix.copy(pointcloud.matrixWorld);
			} else if (!pointcloud.showBoundingBox && node.boundingBoxNode) {
				node.boundingBoxNode.visible = false;
			}   

			// if(node.boundingBoxNode !== undefined && exports.debug.allowedNodes !== undefined){
			// 	if(!exports.debug.allowedNodes.includes(node.name)){
			// 		node.boundingBoxNode.visible = false;
			// 	}
			// }
		}

		// add child nodes to priorityQueue 由近及远、由大及小逐渐加载
		let children = node.getChildren();
		for (let i = 0; i < children.length; i++) {
			let child = children[i];

			let weight = 0; 
			if(camera.isPerspectiveCamera){
				let sphere = child.getBoundingSphere();
				let center = sphere.center;
				let dd = sphere.center.distanceToSquared(camObjPos);
				  
                
                let addPow = viewer.mainViewport.view.isFlying() ? 0 : 0.5  //0-0.5，正常原本是0. 数字越大近处加载越快。但会造成远处加载慢甚至因pointBudge限制不加载。  isFlying：漫游时需要尽量加载一下远处的点云
                //addPow *= window.devicePixelRatio    //devicePixelRatio高的手机需要优先加载最近的高级点云，减少远处的中高级点云。
				let distance = Math.pow(dd,0.5+addPow)//Math.sqrt(dd); //提高距离权重,为了提高近处加载速度。   某些场景近处加载慢优化明显，如SS-t-cqCAL6rJ5i 
				
				//let attenuateDis = 10;//add
				let radius = sphere.radius;
                  
                let projFactor = projFactor0 / distance
				let screenPixelRadius = radius * projFactor;
                 
                /* if(distance > attenuateDis){
                    screenPixelRadius -= (distance - attenuateDis) * Math.sqrt(radius) * projFactor0 * 0.002
                } */
                
				//screenPixelRadius 和 domHeight 成正比，所以手机横屏后screenPixelRadius会变小。这是正常的，因为vhov不变，相同物体高度在横屏后高度变小，所需要的密度不需要那么高了。但hfov横屏后扩大，所以可见的node范围变大，又增加了一些可见node；只是总体的可见node还是减少了。
				//使用hfov和domWidth计算结果相同。
                if(screenPixelRadius < pointcloud.minimumNodePixelSize / Math.pow(dd,addPow)){  //理论上因手机像素小，更不容易堆叠铺满，minimumNodePixelSize应该除以window.deviceRatio 但会造成加载过多，而内存小
					continue;
				}
				weight = screenPixelRadius;
                
                if( !sphere.containsPoint(camObjPos) ){ //add 优先加载屏幕中央的点云（手机端缩小离远效果明显，不会那么稀疏）
                    let dir = new THREE.Vector3().subVectors(center, camObjPos).normalize() 
                    let cos = 1+dir.dot(camObjDir) //0-2
                    weight *= cos/2//Math.pow(cos,0.5)   //幂越高，旁边的容易加载不到,出现缺块
                } 
                
				if(distance - radius < 0){
					weight = Number.MAX_VALUE;
				}
                
                //如果能得到每个方向上的密度，也就是node数量，密度大的远处少加载，因为被遮挡了显示也没有意义，就好了。
			} else {
				// TODO ortho visibility
				//let bb = child.getBoundingBox();
                let sphere = child.getBoundingSphere();		
                //let diagonal = bb.max.clone().sub(bb.min).length();
                const reduce = 0  //0-0.5，正常原本是0.
                if( sphere.radius *  /* Math.pow( */camera.zoom/* ,1-reduce) */   < pointcloud.minimumNodePixelSize   ){
					continue;
				}
                		
				let distance = sphere.center.distanceToSquared(camObjPos); //先加载中间然后四周 
				weight = sphere.radius / distance;
                
				//weight = diagonal;
			}

			priorityQueue.push({pointcloud: element.pointcloud, node: child, parent: node, weight: weight}); //貌似好像二叉堆中子节点和父节点没什么关系，就只是为了方便排序层层遍历
		}
        //手机上像素点更小，所以远处感觉会更稀疏
	}// end priority queue loop

	{ // update DEM  这是什么
		let maxDEMLevel = 4;
		let candidates = pointclouds.filter(p => (p.generateDEM && p.dem instanceof Potree.DEM));
		for (let pointcloud of candidates) {
			let updatingNodes = pointcloud.visibleNodes.filter(n => n.getLevel() <= maxDEMLevel);
			pointcloud.dem.update(updatingNodes);
		}
	}
    
    
    
    
    if(unloadedGeometry.length){//加载点云 
         
        /* for (let i = 0; i < Math.min(Potree.maxNodesLoading, unloadedGeometry.length); i++) {
            unloadedGeometry[i].node.load(unloadedGeometry[i].pointcloud.pcoGeometry); 
        }  */ 
        
        let maxNodesLoading = Common.getBestCount('unloadedGeometry', viewer.lastFrameChanged?2:4, 10,  4, 15 /*  , true  */ )//dur在iphoneX中静止有7，pc是2  //!lastFrameChanged静止时加速下载
        //THREE.Math.clamp(Math.round(9 - dur), 1, 6 ) 
        //console.log('unloadedGeometry',unloadedGeometry.length, 'maxNodesLoading',maxNodesLoading)
        //主要在手机端有效果。不改之前在展示的点云较多时前进会卡。
        for (let i = 0; i < Math.min(maxNodesLoading, unloadedGeometry.length); i++) {
            unloadedGeometry[i].node.load(unloadedGeometry[i].pointcloud.pcoGeometry); 
        }   
        if(!Potree.pointsLoading){
            Potree.pointsLoading = true
            //console.log('startLoad')
            viewer.dispatchEvent('startLoadPoints')
        }  
    }else{
        if(Potree.pointsLoading){
            Potree.pointsLoading = false
            //console.log('load done!')
            setTimeout(()=>{
                Potree.pointsLoading || viewer.dispatchEvent('pointsLoaded')
            },50)
            
        } 
    }
    
    
    
    //add:
    Potree.numVisiblePoints = numVisiblePoints
   
	return {
		visibleNodes: visibleNodes,
		numVisiblePoints: numVisiblePoints,
		lowestSpacing: lowestSpacing
	};
};
/* 
    note:
    缓存中的点数 Potree.lru.numPoints 一般会 大于 每个点云显示点总数的numVisiblePoints 
    当超出缓冲区最大点云数时，加载的点云节点会被dispose彻底消除；否则，隐藏的节点就会等待再次被使用显示
    由于加载按照由近及远、由大及小的顺序，要降低卡顿，就只需要降低Potree.pointBudget即可。但目前只设置了三个层次；另外提供maxLevel细节调节，能显示更均匀. 最好多一个调节pointBudge的滑动条
    
    Potree.lru.numPoints      
    Potree.numVisiblePoints  
    viewer.scene.pointclouds[0].visibleNodes.length
 */
 
 
 
 
 
 
{//HQSplatRenderer
    let oldInit = HQSplatRenderer.prototype.init;
    HQSplatRenderer.prototype.init = function(){
        oldInit()
        viewer.addEventListener('resize',this.resize.bind(this))
    }
    
    HQSplatRenderer.prototype.resize = function(e){
		this.rtDepth.setSize(e.canvasWidth, e.canvasHeight);
		this.rtAttribute.setSize(e.canvasWidth, e.canvasHeight);
    }
     
	HQSplatRenderer.prototype.clear = function(params={}){
		this.init();

		const {renderer, background} = this.viewer;

		if(background === "skybox"){
			renderer.setClearColor(0x000000, 0);
		} else if (background === 'gradient') {
			renderer.setClearColor(0x000000, 0);
		} else if (background === 'black') {
			renderer.setClearColor(0x000000, 1);
		} else if (background === 'white') {
			renderer.setClearColor(0xFFFFFF, 1);
		} else {
			renderer.setClearColor(0x000000, 0);
		}

		params.target || renderer.clear();

		this.clearTargets(params);
	}

	HQSplatRenderer.prototype.render = function(params={}) {
		this.init();

		const viewer = this.viewer;
		const camera = params.camera ? params.camera : viewer.scene.getActiveCamera(); 
		const {width, height} = params.width ? params : this.viewer.renderer.getSize(new THREE.Vector2());

        viewer.renderer.setRenderTarget(params.target||null);

		viewer.dispatchEvent({type: "render.pass.begin",viewer: viewer});

		//params.target || this.resize(width, height);

		const visiblePointClouds = viewer.scene.pointclouds.filter(pc => pc.visible);
		const originalMaterials = new Map();

		for(let pointcloud of visiblePointClouds){
			originalMaterials.set(pointcloud, pointcloud.material);

			if(!this.attributeMaterials.has(pointcloud)){
				let attributeMaterial = new ExtendPointCloudMaterial();
				this.attributeMaterials.set(pointcloud, attributeMaterial);
			}

			if(!this.depthMaterials.has(pointcloud)){
				let depthMaterial = new ExtendPointCloudMaterial();

				depthMaterial.setDefine("depth_pass", "#define hq_depth_pass");
				depthMaterial.setDefine("use_edl", "#define use_edl");

				this.depthMaterials.set(pointcloud, depthMaterial);
			}
		}

		{ // DEPTH PASS
			for (let pointcloud of visiblePointClouds) {
				let octreeSize = pointcloud.pcoGeometry.boundingBox.getSize(new THREE.Vector3()).x;

				let material = originalMaterials.get(pointcloud);
				let depthMaterial = this.depthMaterials.get(pointcloud);

				depthMaterial.size = material.size;
				depthMaterial.minSize = material.minSize;
				depthMaterial.maxSize = material.maxSize;

				depthMaterial.pointSizeType = material.pointSizeType;
				depthMaterial.visibleNodesTexture = material.visibleNodesTexture;
				depthMaterial.weighted = false;
				depthMaterial.screenWidth = width;
				depthMaterial.shape = PointShape.CIRCLE;
				depthMaterial.screenHeight = height;
				depthMaterial.uniforms.visibleNodes.value = material.visibleNodesTexture;
				depthMaterial.uniforms.octreeSize.value = octreeSize;
				depthMaterial.spacing = pointcloud.pcoGeometry.spacing; // * Math.max(...pointcloud.scale.toArray());
				depthMaterial.classification = material.classification;
				depthMaterial.uniforms.classificationLUT.value.image.data = material.uniforms.classificationLUT.value.image.data;
				depthMaterial.classificationTexture.needsUpdate = true;

				depthMaterial.uniforms.uFilterReturnNumberRange.value = material.uniforms.uFilterReturnNumberRange.value;
				depthMaterial.uniforms.uFilterNumberOfReturnsRange.value = material.uniforms.uFilterNumberOfReturnsRange.value;
				depthMaterial.uniforms.uFilterGPSTimeClipRange.value = material.uniforms.uFilterGPSTimeClipRange.value;
				depthMaterial.uniforms.uFilterPointSourceIDClipRange.value = material.uniforms.uFilterPointSourceIDClipRange.value;

				depthMaterial.clipTask = material.clipTask;
				depthMaterial.clipMethod = material.clipMethod;
				depthMaterial.setClipBoxes(material.clipBoxes);
				depthMaterial.setClipPolygons(material.clipPolygons);

				pointcloud.material = depthMaterial;
			}
			
			viewer.pRenderer.render(viewer.scene.scenePointCloud, camera, (params.rtEDL || this.rtDepth), {
				clipSpheres: viewer.scene.volumes.filter(v => (v instanceof SphereVolume)),
			});
		}

		{ // ATTRIBUTE PASS
			for (let pointcloud of visiblePointClouds) {
				let octreeSize = pointcloud.pcoGeometry.boundingBox.getSize(new THREE.Vector3()).x;

				let material = originalMaterials.get(pointcloud);
				let attributeMaterial = this.attributeMaterials.get(pointcloud);

				attributeMaterial.size = material.size;
				attributeMaterial.minSize = material.minSize;
				attributeMaterial.maxSize = material.maxSize;

				attributeMaterial.pointSizeType = material.pointSizeType;
				attributeMaterial.activeAttributeName = material.activeAttributeName;
				attributeMaterial.visibleNodesTexture = material.visibleNodesTexture;
				attributeMaterial.weighted = true;
				attributeMaterial.screenWidth = width;
				attributeMaterial.screenHeight = height;
				attributeMaterial.shape = PointShape.CIRCLE;
				attributeMaterial.uniforms.visibleNodes.value = material.visibleNodesTexture;
				attributeMaterial.uniforms.octreeSize.value = octreeSize;
				attributeMaterial.spacing = pointcloud.pcoGeometry.spacing; // * Math.max(...pointcloud.scale.toArray());
				attributeMaterial.classification = material.classification;
				attributeMaterial.uniforms.classificationLUT.value.image.data = material.uniforms.classificationLUT.value.image.data;
				attributeMaterial.classificationTexture.needsUpdate = true;

				attributeMaterial.uniforms.uFilterReturnNumberRange.value = material.uniforms.uFilterReturnNumberRange.value;
				attributeMaterial.uniforms.uFilterNumberOfReturnsRange.value = material.uniforms.uFilterNumberOfReturnsRange.value;
				attributeMaterial.uniforms.uFilterGPSTimeClipRange.value = material.uniforms.uFilterGPSTimeClipRange.value;
				attributeMaterial.uniforms.uFilterPointSourceIDClipRange.value = material.uniforms.uFilterPointSourceIDClipRange.value;

				attributeMaterial.elevationGradientRepeat = material.elevationGradientRepeat;
				attributeMaterial.elevationRange = material.elevationRange;
				attributeMaterial.gradient = material.gradient;
				attributeMaterial.matcap = material.matcap;

				attributeMaterial.intensityRange = material.intensityRange;
				attributeMaterial.intensityGamma = material.intensityGamma;
				attributeMaterial.intensityContrast = material.intensityContrast;
				attributeMaterial.intensityBrightness = material.intensityBrightness;

				attributeMaterial.rgbGamma = material.rgbGamma;
				attributeMaterial.rgbContrast = material.rgbContrast;
				attributeMaterial.rgbBrightness = material.rgbBrightness;

				attributeMaterial.weightRGB = material.weightRGB;
				attributeMaterial.weightIntensity = material.weightIntensity;
				attributeMaterial.weightElevation = material.weightElevation;
				attributeMaterial.weightRGB = material.weightRGB;
				attributeMaterial.weightClassification = material.weightClassification;
				attributeMaterial.weightReturnNumber = material.weightReturnNumber;
				attributeMaterial.weightSourceID = material.weightSourceID;

				attributeMaterial.color = material.color;

				attributeMaterial.clipTask = material.clipTask;
				attributeMaterial.clipMethod = material.clipMethod;
				attributeMaterial.setClipBoxes(material.clipBoxes);
				attributeMaterial.setClipPolygons(material.clipPolygons);

				pointcloud.material = attributeMaterial;
			}
			
			let gl = this.gl;

			//viewer.renderer.setRenderTarget(null);
			viewer.pRenderer.render(viewer.scene.scenePointCloud, camera, this.rtAttribute, {
				clipSpheres: viewer.scene.volumes.filter(v => (v instanceof SphereVolume)),
				//material: this.attributeMaterial,
				blendFunc: [gl.SRC_ALPHA, gl.ONE],
				//depthTest: false,
				depthWrite: false
			});
		}

		for(let [pointcloud, material] of originalMaterials){
			pointcloud.material = material;
		}


        

		
        
         
        
		if(viewer.background === "skybox"){
			viewer.renderer.setClearColor(0x000000, 0);
			viewer.renderer.clear();
			viewer.skybox.camera.rotation.copy(viewer.scene.cameraP.rotation);
			viewer.skybox.camera.fov = viewer.scene.cameraP.fov;
			viewer.skybox.camera.aspect = viewer.scene.cameraP.aspect;
			
			viewer.skybox.parent.rotation.x = 0;
			viewer.skybox.parent.updateMatrixWorld();

			viewer.skybox.camera.updateProjectionMatrix();
			viewer.renderer.render(viewer.skybox.scene, viewer.skybox.camera);
		} else if (viewer.background === 'gradient') {
			viewer.renderer.setClearColor(0x000000, 0);
			viewer.renderer.clear();
			viewer.renderer.render(viewer.scene.sceneBG, viewer.scene.cameraBG);
		} else if (viewer.background === 'black') {
			viewer.renderer.setClearColor(0x000000, 1);
			viewer.renderer.clear();
		} else if (viewer.background === 'white') {
			viewer.renderer.setClearColor(0xFFFFFF, 1);
			viewer.renderer.clear();
		} else {
			viewer.renderer.setClearColor(0x000000, 0);
			viewer.renderer.clear();
		}


          

		{ // NORMALIZATION PASS
			let normalizationMaterial = this.useEDL ? this.normalizationEDLMaterial : this.normalizationMaterial;

			if(this.useEDL){
				normalizationMaterial.uniforms.edlStrength.value = viewer.edlStrength;
				normalizationMaterial.uniforms.radius.value = viewer.edlRadius;
				normalizationMaterial.uniforms.screenWidth.value = width;
				normalizationMaterial.uniforms.screenHeight.value = height;
				normalizationMaterial.uniforms.uEDLMap.value = (params.rtEDL || this.rtDepth).texture;
			}

			normalizationMaterial.uniforms.uWeightMap.value = this.rtAttribute.texture;
			normalizationMaterial.uniforms.uDepthMap.value = this.rtAttribute.depthTexture;
			
			Utils.screenPass.render(viewer.renderer, normalizationMaterial);
		}

		viewer.renderer.render(viewer.scene.scene, camera);

		viewer.dispatchEvent({type: "render.pass.scene", viewer: viewer});

        viewer.renderer.render(viewer.scene.sceneOverlay, camera);// add   透明贴图层


		viewer.renderer.clearDepth();

		viewer.transformationTool.update();
        if(!params.target){
                                                                                 
            
            //测量线
            viewer.dispatchEvent({type: "render.pass.perspective_overlay",viewer: viewer, camera});
            viewer.renderer.render(viewer.overlay, camera);//从 viewer.renderDefault搬过来，为了reticule不遮住测量线
        }
		viewer.renderer.render(viewer.controls.sceneControls, camera);
		viewer.renderer.render(viewer.clippingTool.sceneVolume, camera);
		viewer.renderer.render(viewer.transformationTool.scene, camera);

		viewer.renderer.setViewport(width - viewer.navigationCube.width, 
									height - viewer.navigationCube.width, 
									viewer.navigationCube.width, viewer.navigationCube.width);
		viewer.renderer.render(viewer.navigationCube, viewer.navigationCube.camera);		
		viewer.renderer.setViewport(0, 0, width, height);
		
		viewer.dispatchEvent({type: "render.pass.end",viewer: viewer});
        viewer.renderer.setRenderTarget(null) 
	}
     
}

    
    

//PointCloudOctreeGeometry.js
PointCloudOctreeGeometryNode.prototype.loadHierachyThenPoints = function(pointcloud){
    let node = this;

    // load hierarchy
    let callback = function (node, hbuffer) {

        let tStart = performance.now();

        let view = new DataView(hbuffer);

        let stack = [];
        let children = view.getUint8(0);
        let numPoints = view.getUint32(1, true);
        node.numPoints = numPoints;
        stack.push({children: children, numPoints: numPoints, name: node.name});

        let decoded = [];

        let offset = 5;
        while (stack.length > 0) {
            let snode = stack.shift();
            let mask = 1;
            for (let i = 0; i < 8; i++) {
                if ((snode.children & mask) !== 0) {
                    let childName = snode.name + i;

                    let childChildren = view.getUint8(offset);
                    let childNumPoints = view.getUint32(offset + 1, true);

                    stack.push({children: childChildren, numPoints: childNumPoints, name: childName});

                    decoded.push({children: childChildren, numPoints: childNumPoints, name: childName});

                    offset += 5;
                }

                mask = mask * 2;
            }

            if (offset === hbuffer.byteLength) {
                break;
            }
        }

        // console.log(decoded);

        let nodes = {};
        nodes[node.name] = node;
        let pco = node.pcoGeometry;
        let maxLevel_ = 0
        for (let i = 0; i < decoded.length; i++) {
            let name = decoded[i].name;
            let decodedNumPoints = decoded[i].numPoints;
            let index = parseInt(name.charAt(name.length - 1));
            let parentName = name.substring(0, name.length - 1);
            let parentNode = nodes[parentName];
            let level = name.length - 1; 
            maxLevel_ = Math.max(maxLevel_,level)//add
            
            let boundingBox = Utils.createChildAABB(parentNode.boundingBox, index);

            let currentNode = new PointCloudOctreeGeometryNode(name, pco, boundingBox);
            currentNode.level = level;
            currentNode.numPoints = decodedNumPoints;
            currentNode.hasChildren = decoded[i].children > 0;
            currentNode.spacing = pco.spacing / Math.pow(2, level);
            parentNode.addChild(currentNode);
            nodes[name] = currentNode;
        }
        pco.dispatchEvent({type:'updateNodeMaxLevel',level:maxLevel_});//add
        let duration = performance.now() - tStart;
        if(duration > 5){
            /* let msg = `duration: ${duration}ms, numNodes: ${decoded.length}`;
            console.log(msg); */
        }

        node.loadPoints();
    };
    if ((node.level % node.pcoGeometry.hierarchyStepSize) === 0) {
        // let hurl = node.pcoGeometry.octreeDir + "/../hierarchy/" + node.name + ".hrc";
        let hurl = node.pcoGeometry.octreeDir + '/' + node.getHierarchyPath() + '/' + node.name + '.hrc';
        //hurl += '?m='+node.pcoGeometry.timeStamp //add
        let startLoad = (hurl)=>{
            let xhr = XHRFactory.createXMLHttpRequest();
            xhr.open('GET', hurl, true);
            xhr.responseType = 'arraybuffer';
            xhr.overrideMimeType('text/plain; charset=x-user-defined');
            xhr.onreadystatechange = () => {
                if (xhr.readyState === 4) {
                    if (xhr.status === 200 || xhr.status === 0) {
                        let hbuffer = xhr.response;
                        callback(node, hbuffer);
                    } else {
                        console.log('Failed to load file! HTTP status: ' + xhr.status + ', file: ' + hurl);
                        Potree.numNodesLoading--;
                    }
                }
            };
            try {
                xhr.send(null);
            } catch (e) {
                console.log('fehler beim laden der punktwolke: ' + e);
            }  
        } 
            
        Potree.getRealUrl(hurl, startLoad)
        
        
    }
} 
PointCloudOctreeGeometryNode.prototype.loadPoints = function(){
    let name = this.name
    this.pcoGeometry.loader.load(this, ()=>{//callback
        viewer.dispatchEvent('pointcloud_changed')  
         
        
        //console.log('loadPoints success   ', name) 
    });
} 
//加载点云成功->准备渲染画面->更新点云可见性updateVisibility->请求加载新的点云

 
PointCloudOctreeGeometryNode.prototype.traverse = function(t, e){//add from navvis 25.js
    void 0 === e && (e = !0);
    for (var n, i = e ? [this] : []; void 0 !== (n = i.pop()); ) {
        t(n);
        for (var o = 0, r = n.children; o < r.length; o++) {
            var a = r[o];
            null !== a && i.push(a)
        }
    }
}

Object.assign( PointCloudOctreeGeometry.prototype, THREE.EventDispatcher.prototype  );




LRU.prototype.freeMemory = function(){
    
    if (this.elements <= 1) {
        return;
    } 
    let memoryRatio = browser.isMobile() ? 2 : 5;
    //改成navvis的，使用pointBudget，否则四屏点云闪烁。 (似乎要比updateVisiblede的node时限制要宽些，作为缓存继续存着。否则会闪烁)
    let max =  viewer.viewports.length * memoryRatio * Potree.pointBudget 
       
    for (; this.numPoints > max;  ) { 
        var node = this.getLRUItem();
        node && this.disposeDescendants(node); //this.disposeSubtree(node)
    } 
    
} 
/* 
LRU.prototype.disposeSubtree = function(t) {//add from navvis 25.js  和原来的disposeDescendants功能一样
    var e = [t];
    t.traverse((function(t) {
        t.loaded && e.push(t)
    }));
    for (var n = 0, i = e; n < i.length; n++) {
        var o = i[n];
        o.dispose(),
        this.remove(o)
    }
}*/

VolumeTool.prototype.update = function(){}

VolumeTool.prototype.startInsertion = function(args = {}){
    
    let volume; 
    
    if(args.type){
        volume = new args.type();
    }else{
        volume = new Potree.BoxVolume(Object.assign(args,{clip:true}) );
    }
    volume.highlight = true  
    volume.name = args.name || 'Volume-'+args.clipTask;
    volume.isNew = true
    viewer.transformObject(null)//先清空
    //console.log('startInsertion',volume.uuid)
    let oldVisiBoxes
    if(args.clipTask == Potree.ClipTask.SHOW_INSIDE){ //如果是显示类型，需要将所有同类型的解除效果，否则看不到效果。 （或者可以在添加非第一个时去除highlight效果，会更自然，但看不清全貌）
        oldVisiBoxes = viewer.scene.volumes.filter(v => v.clipTask == Potree.ClipTask.SHOW_INSIDE && !v.highlight  )
        oldVisiBoxes.forEach(box=>box.highlight = true)
    }

    
    
    let updatePose = ()=>{ //保证在视野中的大小一致： 
        let camera = this.viewer.scene.getActiveCamera();
        let w = math.getScaleForConstantSize({
            width2d: 300,
            camera , position:volume.getWorldPosition(new THREE.Vector3()) ,
            resolution: viewer.mainViewport.resolution//2
        }) 
        /* let wp = volume.getWorldPosition(new THREE.Vector3()).applyMatrix4(camera.matrixWorldInverse);
        // let pp = new THREE.Vector4(wp.x, wp.y, wp.z).applyMatrix4(camera.projectionMatrix);
        let w = Math.abs((wp.z / 3));*/
        if(!isNaN(w))volume.scale.set(w,  w,  w); 
        
        
        {//使水平朝向与camera一致
            let direction = viewer.mainViewport.view.direction.setZ(0) 
            volume.quaternion.copy(math.getQuaByAim(direction)) 
        }
        
    }

    this.dispatchEvent({
        type: 'start_inserting_volume',
        volume: volume
    }); 
    updatePose()
    this.viewer.scene.addVolume(volume);
    this.scene.add(volume);
    
    
    
    
    let drag = e => {
        
        let I = Utils.getMousePointCloudIntersection(
            viewer.mainViewport,
            viewer.inputHandler.mouse,
            viewer.inputHandler.pointer,
            this.viewer.scene.getActiveCamera(), 
            this.viewer, 
            this.viewer.scene.pointclouds, 
            {pickClipped: args.clipTask == Potree.ClipTask.SHOW_OUTSIDE  } //无视clip状态
        );
            
        var worldPos = I && I.location 
        if(!worldPos){
            return  
        }
             
        volume.position.copy(worldPos);
        
        updatePose() 
    };
     
    
    
    
    let cancel = ()=>{ 
        end('remove')  
    }
    let end = (e) => { 
        if(e.button == THREE.MOUSE.RIGHT && e.pressDistance<=Potree.config.clickMaxDragDis) {//remove
            e = 'remove'
        } 
        //console.log('end',volume.uuid, e)
        if(e != 'remove' && (!e.isAtDomElement || e.pressDistance>Potree.config.clickMaxDragDis))return continueDrag()
        volume.removeEventListener('drag', drag);
        volume.removeEventListener('drop', end);
        this.viewer.removeEventListener('cancel_insertions', cancel);
        volume.isNew = false
        viewer.removeEventListener('camera_changed',  updatePose)
        if(e == 'remove'){
            viewer.scene.removeVolume(volume);  //删除没完成的
        }else{
            viewer.transformObject(volume)  
            volume.highlight = false
          
        }
        
        volume.dispatchEvent({type:'createFinish', success:e != 'remove'  })
        oldVisiBoxes && oldVisiBoxes.forEach(box=>box.highlight = false)
    };
     
    let continueDrag = ( )=>{  
        //console.log('continueDrag',volume.uuid )
        var timer = setTimeout(()=>{//等 drag=null之后 //右键拖拽结束后需要重新得到drag  
            if(volume.parent && volume.isNew){
                viewer.inputHandler.startDragging( volume  ,  {notPressMouse:true}
                   /*  {endDragFun: e.drag.endDragFun, notPressMouse:e.drag.notPressMouse, dragViewport:e.drag.dragViewport}  */
                ) 
            }
        },1)
        return timer
    }
    
    volume.addEventListener('drag', drag);
    volume.addEventListener('drop', end);
    
    this.viewer.addEventListener('cancel_insertions', cancel);
    viewer.addEventListener('camera_changed',  updatePose)
    
    this.viewer.inputHandler.startDragging(volume,  {notPressMouse:true});
    
    return volume;
}

LineGeometry.prototype.setPositions = function( array  ) { //xzw改成类似LineSegments的多段线  （第二个点和第三个点之间是没有线段的, 所以不用在意线段顺序）
    const points = new Float32Array( array ); 
    LineSegmentsGeometry.prototype.setPositions.call(this, points ); 
    return this; 
}  
 
 
Object.assign(ExtendView.prototype, THREE.EventDispatcher.prototype)
Object.assign(ExtendScene.prototype, THREE.EventDispatcher.prototype );