potree-sdk/src/custom/viewer/map/MapViewer.js

import * as THREE from "../../../../libs/three.js/build/three.module.js";
import {MapLayer} from './Map.js'
import {FirstPersonControls} from '../../../navigation/FirstPersonControlsNew.js'
import {InputHandler} from "../../../navigation/InputHandlerNew.js";

import {ViewerBase} from "../viewerBase.js"
import {ExtendView} from "../../../viewer/ExtendView.js";
import Viewport from "../Viewport.js"; 


import math from "../../utils/math.js";
//import CursorDeal from '../utils/CursorDeal.js' 
import {Images360} from '../../modules/panos/Images360.js'
import Common from '../../utils/Common.js' 
import {transitions, easing, lerp} from "../../utils/transitions.js";
import {config } from "../../settings.js";
/* var centerCross = new THREE.Mesh(new THREE.SphereGeometry(1, 4, 4),new THREE.MeshBasicMaterial({
    transparent:true,  color:"#ff0000", opacity:0.5
})); */
import CopyShader from '../../materials/postprocessing/CopyShader.js'
import {ShaderPass} from '../../materials/postprocessing/ShaderPass.js' 

/* const mapHeight = -1000;//要比点云低。最低
const cameraHeight = 1000;  //最高 */
const panosHeight = config.map.mapHeight + 100 //要比点云低  （marker）
const cursorHeight = 0;//比地图高就行  
const routeLayerHeight = config.map.mapHeight + 105

const texLoader = new THREE.TextureLoader()
const planeGeo = new THREE.PlaneBufferGeometry(1,1)

const markerSize = 1;


var initCameraFeildWidth = 50
var panoMarkerMats  
 

export class MapViewer extends ViewerBase{
    constructor(dom){
        super(dom, {
            clearColor: Potree.config.mapBG,
            name: 'mapViewer'
        })
        this.visible = true
        this.initScene()
        this.needRender_ = false 
         
        this.mapLayer = new MapLayer(this, this.viewports[0])
        this.scene.add(this.mapLayer.sceneGroup)
        this.mapLayer.sceneGroup.position.setZ(Potree.config.map.mapHeight)
        this.mapRatio = 0.5
        this.splitDir = 'leftRight'
        
        
        //因context的preserveDrawingBuffer为false之后，canvas渲染多个viewport时会自动clear，所以若不渲染就会是空的。所以没有变化时就直接拷贝buffer好了。
        this.copyPass = new ShaderPass( CopyShader );
        this.copyBuffer = new THREE.WebGLRenderTarget( 100, 100 ,  {
            minFilter: THREE.LinearFilter,
			magFilter: THREE.LinearFilter,
			format: THREE.RGBAFormat,
			stencilBuffer: false, 
        });
        
        
        
        viewer.addEventListener("camera_changed", (e)=>{
            let needUpdateCursor
            if(e.viewport == viewer.mainViewport){
                needUpdateCursor = true
            }else if(e.viewport == this.viewports[0]){//attachedToViewer
                needUpdateCursor = true
                this.mapChanged = true 
                this.updateWhenAtViewer() 
                e.changeInfo.projectionChanged && this.setViewLimit()
            }
            needUpdateCursor && this.updateCursor() 
        })
        this.addEventListener("camera_changed", (e)=>{
            e.changeInfo.projectionChanged && this.setViewLimit()
        }) 
         
        //viewer.addEventListener("global_mousemove", this.updateWhenAtViewer.bind(this))  //鼠标移动时reticule也动，所以直接就needRender
        /* viewer.reticule.addEventListener('update',(e)=>{
            if(this.attachedToViewer)this.needRender = true 
        }) */
         
        
        viewer.scene.addEventListener("360_images_added", this.addPanos.bind(this))
        
        
        viewer.addEventListener("loadPointCloudDone",  this.initProjection.bind(this))
        
        this.addEventListener('global_click',(e)=>{
            if(!e.isTouch && e.button != THREE.MOUSE.LEFT)return
            this.updateClosestPano(e.intersect)
        })
        
        
        
        this.addEventListener('add',(e)=>{//添加其他mesh
            this.scene.add(e.object)
            if(e.name == 'route'){
                e.object.position.z = routeLayerHeight 
            } 
            Potree.Utils.setObjectLayers(e.object, 'mapObjects' )
        })
        
        
        viewer.addEventListener('allLoaded',()=>{
            
            this.setViewLimit('standard')
            
        })
   
        
        if(!Potree.settings.isOfficial){
            let domRoot = viewer.renderer.domElement.parentElement; 
            let elAttach = $("<input type='button' value='map绑定'></input>");
            elAttach.css({
                position : "absolute",
                right : '80%',
                bottom: '20px',
                zIndex: "10000",
                fontSize:'1em', color:"black",
                background:'rgba(255,255,255,0.8)',
            })
            let state = false
            elAttach.on("click", () => {
                state = !state
                this.attachToMainViewer(state, 'measure')
                elAttach.val(state ? 'map分离':'map绑定')
            }); 
            domRoot.appendChild(elAttach[0]);
            
            
        }
        
    }
    
    
    get needRender(){
        return this.needRender_
    }
    set needRender(n){ 
        this.needRender_ = n
        n && (this.viewports[0].needRender = true) //使attachedToViewer时在renderDefault中可渲染
    }
    get mapChanged(){
        return this.mapChanged_
    }   
    set mapChanged(c){//镜头移动、地图内容改变都会为true
        this.mapChanged_ = c
        c && (this.needRender = true)  
    }
    
    
    
    waitLoadDone(callback){//确保加载完后执行 
        let timer   //等待一段时间看有没有新加载的tile,如果超过这个时间没有就不等了，算加载结束
     
        let pauseCountDown = ()=>{//重新等待加载结束,中断倒计时 
            clearTimeout(timer) 
            //console.log('pauseCountDown')
        }
        
        let freshCountDown = ()=>{//刷新倒计时
            //console.log('freshCountDown') 
             
            clearTimeout(timer) 
            timer = setTimeout(()=>{   
                this.mapLayer.removeEventListener('loadDone', freshCountDown)
                this.mapLayer.removeEventListener('startLoad', pauseCountDown) 
                callback() 
            }, document.hidden ? 5000 : 500)    
        } 
           
        
        this.mapLayer.addEventListener('loadDone', freshCountDown) 
        this.mapLayer.addEventListener('startLoad', pauseCountDown)
        if(this.mapLayer.loadingInProgress == 0){
            freshCountDown()
        }
    }
    
    
    
    
    
    
    addListener(images360){
        images360.addEventListener('flyToPano',e=>{
            let toPano = e.toPano
            if(toPano.dontMoveMap) return
            
            /* transitions.start(lerp.vector(this.view.position, toPano.pano.position.clone().setZ(cameraHeight), 
            
            (pos, progress)=>{
                  
            }), toPano.duration, null, 0, easing[toPano.easeName]  );  */ 
            let boundSize// = new THREE.Vector2(10,10)
            
            this.moveTo(toPano.pano.position.clone().setZ(Potree.config.map.cameraHeight),  boundSize, toPano.duration, null, toPano.easeName) 
        })
        
        
    }
    
    
    
    initProjection(){
        this.started = true
        this.mapLayer.initProjection()
        
    }
     
    initScene(){
        let w = initCameraFeildWidth
        let width = this.renderArea.clientWidth;
		let height = this.renderArea.clientHeight; 
        //let aspect = width / height
        this.camera = new THREE.OrthographicCamera(-width/2,width/2,height/2,-height/2/* -w/2, w/2, w/2/aspect, -w/2/aspect */, 0.01, 10000);
        this.camera.zoom = width / w  //zoom越大视野越小
        //this.camera.position.set(0,0,10);
        this.camera.up.set(0,0,1)
        //this.camera.lookAt(new THREE.Vector3())
        //this.camera.updateMatrixWorld()
         
        this.view = new ExtendView();
        this.view.position.set(0,0,Potree.config.map.cameraHeight);
        this.view.lookAt(0,0,0)
        
            
        let viewport = new Viewport( this.view, this.camera, {
            left:0, bottom:0, width:1, height: 1, name:'mapViewport'  
        })
        viewport.axis = ["x","y"]
        viewport.axisSign = [1,1]
        
        viewport.noPointcloud = true; //不要渲染点云
        viewport.render = this.render.bind(this)//标志给mainView渲染
        //viewport.unableDepth = true //depthBasicMaterial等在此viewport中不开启depth
        
        
        viewport.addEventListener('resize',()=>{
            this.copyBuffer.setSize(viewport.resolution2.x, viewport.resolution2.y)
        })
        this.viewports = [viewport]
        
               
                
                
        this.controls = new FirstPersonControls(this, this.viewports[0]);
        this.controls.setEnable(true)
        this.scene = new THREE.Scene();  
  
        
        
        this.inputHandler = new InputHandler(this, this.scene);
        this.inputHandler.name = 'mapInputHandler'
        //this.inputHandler.addInputListener(this.controls);
        this.inputHandler.registerInteractiveScene(this.scene);//interactiveScenes
       
        this.viewports[0].interactiveScenes = this.inputHandler.interactiveScenes;//供viewer的inputHandler使用
         
        var cursor = new THREE.Mesh(planeGeo, new THREE.MeshBasicMaterial({
            transparent:true,
            opacity:0.9,
            depthTest : false, //防止透明冲突
            map: texLoader.load(Potree.resourcePath+'/textures/pic_location128.png' )
        }))
            cursor.position.set(0,0,cursorHeight);
            
            
        this.cursor = cursor
       
        this.scene.add(cursor)
        Potree.Utils.setObjectLayers(this.scene, 'mapObjects' )
    }
    
    setViewLimit(state){//设置边界，当编辑空间模型等时要解禁
        if(!state)state = this.limitBoundState
        if(!state)return 
        this.limitBoundState = state
        
        let setting = Potree.config.OrthoCameraLimit[state]
        if(setting){ 
            this.camera.zoomLimit = $.extend({},setting.zoom);
            
             
            let lonlatCenter = viewer.transform.lonlatToLocal.inverse([0,0]);
            let minY = viewer.transform.lonlatToLocal.forward([lonlatCenter[0], -90+setting.latPad])[1] //屏幕边界的bound
            let maxY = viewer.transform.lonlatToLocal.forward([lonlatCenter[0], 90-setting.latPad])[1] 
            /*this.view.limitBound = new THREE.Box3(
                new THREE.Vector3(setting.xBound[0], minY, Potree.config.map.cameraHeight), 
                new THREE.Vector3(setting.xBound[1], maxY, 1 / 0)
            )  */
              
            let halfHeight = this.viewports[0].resolution.y / 2 / this.camera.zoom;//屏幕所占高度的一半
            let halfWidth = this.viewports[0].resolution.x / 2 / this.camera.zoom;
            this.view.limitBound = new THREE.Box3(
                new THREE.Vector3(setting.xBound[0]+halfWidth, minY+halfHeight, Potree.config.map.cameraHeight), 
                new THREE.Vector3(setting.xBound[1]-halfWidth, maxY-halfHeight, 1 / 0)
            ) 
            
            
        }else{  
            this.view.limitBound = null
            this.camera.zoomLimit  = null
        }
        
    } 
    
    updateCursor(){
        //console.log('pos', viewer.mainViewport.camera.position.toArray() ) 
        var scale = math.getScaleForConstantSize( {//规定下最小最大像素
            minSize : 80,  maxSize : 200,   nearBound : initCameraFeildWidth*0.1 , farBound : initCameraFeildWidth*2,
            camera:this.camera , position: this.cursor.getWorldPosition(new THREE.Vector3()),
            resolution: this.viewports[0].resolution//2
        })
        this.cursor.scale.set(scale, scale, scale);//当地图缩放时
        this.cursor.position.copy(viewer.mainViewport.camera.position).setZ(cursorHeight)//当场景镜头旋转移动时
        this.cursor.rotation.z = viewer.mainViewport.view.yaw
        this.needRender = true
    }
    
    addPanos(e){
        var panosGroup = new THREE.Object3D;  panosGroup.name = 'markers'
        panoMarkerMats = {
            default: new THREE.MeshBasicMaterial({
                transparent:true,
                opacity: 0.5,
                map: texLoader.load(Potree.resourcePath+'/textures/map_marker.png' ),
            }),
            selected: new THREE.MeshBasicMaterial({
                transparent:true,
                opacity: 1,
                map: texLoader.load(Potree.resourcePath+'/textures/map_marker.png' ),
            })
        }
        
         
        e.images.panos.forEach(pano=>{
            pano.mapMarker = new THREE.Mesh(planeGeo, panoMarkerMats.default);
            pano.mapMarker.position.copy(pano.position).setZ(0)   
            pano.mapMarker.scale.set(markerSize,markerSize,markerSize)
            pano.mapMarker.name = 'mapMarker'
            panosGroup.add(pano.mapMarker); 
            
            
            let mouseover = (e)=>{ 
                if(!e.byMap){
                    pano.mapMarker.material = panoMarkerMats.selected
                    if(!e.byMainView) pano.dispatchEvent({type: "hoverOn", byMap:true})
                    this.needRender = true    
                }
            }
            
            let mouseleave = (e)=>{
                if(!e.byMap){
                    pano.mapMarker.material = panoMarkerMats.default
                    if(!e.byMainView) pano.dispatchEvent({type: "hoverOff", byMap:true})
                    this.needRender = true
                }
            }
             
            
            pano.mapMarker.addEventListener('mouseover', mouseover);  
			pano.mapMarker.addEventListener('mouseleave', mouseleave);
            
            pano.addEventListener('hoverOn', mouseover)
            pano.addEventListener('hoverOff', mouseleave)
            
            let onclick = (e)=>{
                viewer.images360.flyToPano(pano)
            }
            pano.mapMarker.addEventListener('click', onclick); 
            
            pano.addEventListener('isVisible',(e)=>{//是否显示该点的mesh(不显示也能走）   
                //console.log('panoMarker isVisible', pano.id, e.visible)
                Potree.Utils.updateVisible(pano.mapMarker, 'panoVisible', e.visible )
                this.needRender = true
                
            })
            pano.addEventListener('rePos',(e)=>{
                pano.mapMarker.position.copy(pano.position).setZ(0)
            })
        })
        this.scene.add(panosGroup)
        panosGroup.position.z = panosHeight
        this.panosGroup = panosGroup
        Potree.Utils.setObjectLayers(panosGroup, 'mapObjects' )
        
        
        /* e.images.on('markersDisplayChange', (show)=>{
            panosGroup.visible = show
            this.needRender = true
        }) */
        
        //-------
        
        //this.fitPanosToViewport()


        this.initFitView()

    }
    
    
    
    updateClosestPano(intersect){
        if(viewer.images360.flying)return; 
        intersect = intersect && intersect.orthoIntersect
        if(!intersect)return
        
        intersect = intersect.clone().setZ(0)
        
        const minDis = 20 //距离鼠标不能太远

        
        var filterFuncs = [
            Images360.filters.isEnabled(),
            Images360.filters.isVisible(),//只走显示的点，否则会走到别的层  
            (pano)=>{
                return pano.position.clone().setZ(0).distanceTo(intersect) < minDis 
            }, 
        ]; 
       
        var pano = Common.find(viewer.images360.panos,  filterFuncs, [Images360.sortFunctions.floorDisSquaredToPoint(intersect)]);
        if (pano && pano != viewer.images360.currentPano ) {
           viewer.images360.flyToPano(pano)
            
        }   
          
    }
    
    
    fitPanosToViewport(){//使所有漫游点占满viewport 
        
        //var w = viewer.bound.boundSize.x; 
        var boundSize = viewer.images360.bound.size.clone().multiplyScalar(1.1);
        boundSize.max(new THREE.Vector3(4,4,4))
        let endPosition = viewer.images360.bound.center.clone()
        this.moveTo(endPosition, boundSize, 0) 
    }

    fitToPointcloud(pointcloud, duration=400){
        var boundSize = pointcloud.bound.getSize(new THREE.Vector3)/* .multiplyScalar(1.1); */
            boundSize.max(new THREE.Vector3(4,4,4))
        let endPosition = pointcloud.bound.getCenter(new THREE.Vector3)
        this.moveTo(endPosition, boundSize, duration) //给点duration去变化 否则地图放大后所占的还是很小
    }

    initFitView(){ 
        let dis = 5 , px = 70 //地图上px像素长度代表的距离为dis  //px是手动缩放到5m后发现是这个长度
        let zoom = px / dis;
        this.camera.zoom = zoom
        this.moveTo(viewer.images360.position/* viewer.images360.bound.center */) 
        this.camera.updateProjectionMatrix()

    }
    
    fitToDatasets(datasets){
        let bound = new THREE.Box3; 
        datasets.forEach(e=>bound.union(e.bound))
        let center = bound.getCenter(new THREE.Vector3)
        let size = bound.getSize(new THREE.Vector3)
        
        this.moveTo(center, size, 200 ) //给duration是为了顺应视口大小改变，缓冲
    }
    
    moveTo(endPosition, boundSize, duration=0, margin, easeName ){//前两个参数有xy即可
        endPosition = new THREE.Vector3(endPosition.x,endPosition.y,Potree.config.map.cameraHeight)
        this.view.moveOrthoCamera(this.viewports[0],  {endPosition, boundSize, margin},   duration,  easeName)
        
       
        
        
        /* let endZoom, startZoom = this.camera.zoom 
        
        //修改相机为bound中心，这样能看到全部（宽度范围内）
        
        this.view.setView({ position:endPosition,  duration, 
            callback:()=>{//done
                 
            },
            onUpdate:(progress)=>{ 
                if(boundSize){ 
                    let aspect = boundSize.x / boundSize.y
                    let w, h; 
                    
                    if(this.camera.aspect > aspect){//视野更宽则用bound的纵向来决定
                        h = boundSize.y
                        //w = h * this.camera.aspect
                        endZoom = this.viewports[0].resolution.y / h
                    }else{
                        w = boundSize.x; 
                        //h = w / this.camera.aspect
                        endZoom = this.viewports[0].resolution.x / w
                    }  
                    //onUpdate时更新endzoom是因为画布大小可能更改
                    
                    
                    this.camera.zoom = endZoom * progress + startZoom * (1 - progress)
                    this.camera.updateProjectionMatrix() 
                } 
            },
            
            Easing:easeName
        
        }) */
          
            
    }
    
    
    
    
    updateWhenAtViewer(e){//两个触发来源： 1 camera_changed时  2 mapLayer.needUpdate时。  render在viewer中执行
        if(this.attachedToViewer){ 
            if(this.started) this.mapLayer.update()   
            this.needRender = true 
        } 
    }
    
    update(delta, areaSize ){
        if(!this.visible && !this.attachedToViewer )return
        
        
        if(this.attachedToViewer){
            if(this.mapLayer.needUpdate){
                this.updateWhenAtViewer()
            }
            return
        }            
         
         
        this.updateScreenSize()
         
        this.controls.update(delta);
        this.view.applyToCamera(this.camera) 
        
            
        let changed = this.cameraChanged() 
        
         
        if(this.started && (changed || this.mapLayer.needUpdate))this.mapLayer.update()
        
        if(changed /*||   || this.needRender */){ 
            /* this.dispatchEvent({
                type: "camera_changed", 
                camera: this.camera,
                viewport : this.viewports[0]
            }) */
            this.mapChanged = true
            this.needRender = true
            this.updateCursor()//更改大小
            
        }
        this.render()
        
    }
    
    attachToMainViewer(state, desc, mapRatio=0.5, options={}){//转移到viewer中。测量时展示or截图需要
        
        if(!Potree.settings.isOfficial)this.renderArea.style.display = state ? 'none':'block'
        
        if(state){
            this.enabledOld = this.enabled
            this.enabled = true
            
            if(mapRatio != 'dontSet'){
                this.changeSplitScreenDir(options.dir, mapRatio)
                 
                if(this.attachedToViewer){ 
                    //this.fitPanosToViewport() 
                    viewer.updateScreenSize({forceUpdateSize:true})        
                    return
                }                
                viewer.viewports = [viewer.mainViewport, viewer.mapViewer.viewports[0] ];//因为mainViewer的相机变化会触发map的变化，所以先渲染mainViewer
            }
              
            
            if(desc == 'measure') this.inputHandler.registerInteractiveScene(viewer.measuringTool.scene);//虽然用的是viewer的inputHandler,但借用了this.inputHandler的interactiveScenes
            else if(desc == 'split4Screens') {
                this.inputHandler.registerInteractiveScene(viewer.scene.scene);
            }
            
        }else{
            if(!this.attachedToViewer)return
             
            viewer.mainViewport.left = 0;
            viewer.mainViewport.bottom = 0;
            viewer.mainViewport.width = 1;
            viewer.mainViewport.height = 1;
             
            this.viewports[0].width = 1;
            this.viewports[0].bottom = 0;
            this.viewports[0].height = 1;
            this.viewports[0].left = 0;
            
            this.inputHandler.unregisterInteractiveScene(viewer.measuringTool.scene);
            this.inputHandler.unregisterInteractiveScene(viewer.scene.scene);
            viewer.viewports = [viewer.mainViewport]
            this.updateScreenSize({forceUpdateSize:true}) //更新相机projectionMatrix
        }
        
        //if(desc == 'measure')this.renderMeasure = state 
        this.attachedToViewer = state
        
        
        
        
         
        viewer.updateScreenSize({forceUpdateSize:true})
        
        
        //mapRatio != 'dontSet' && !options.dontFit && this.moveTo(...)//要写在updateScreenSize后面，因为要根据视图大小来fit
        if(options.moveToCurrentPos){
            let boundSize = new THREE.Vector2(10,10)
            let duration = 1000
            this.moveTo(viewer.images360.position.clone(), boundSize, duration)
        }    
        this.needRender = true
    }
    
    changeSplitScreenDir(dir, mapRatio){//左右 | 上下
        //if(!dir || dir == this.dir)return
        if(dir )this.splitDir = dir
        this.updateSplitSize(mapRatio)
        /* if(this.attachedToViewer){ //如果已经分屏了，中途修改方向的话……
            this.updateSplitSize()
        } */ 
    }
    updateSplitSize(mapRatio){
        if(mapRatio != void 0) this.mapRatio = mapRatio
        
        //console.log(this.mapRatio)
        
        if(this.splitDir == 'leftRight'){//地图在左方
            viewer.mainViewport.left = this.mapRatio
            viewer.mainViewport.width = 1-this.mapRatio
            this.viewports[0].width = this.mapRatio; 
            
            viewer.mainViewport.bottom = this.viewports[0].bottom = 0
            viewer.mainViewport.height = this.viewports[0].height = 1
             
        }else if(this.splitDir == 'upDown'){ //地图在下方
            viewer.mainViewport.bottom = this.mapRatio
            viewer.mainViewport.height = 1-this.mapRatio
            this.viewports[0].height = this.mapRatio;  
            
            viewer.mainViewport.left = this.viewports[0].left = 0
            viewer.mainViewport.width = this.viewports[0].width = 1
            
        }
        if(this.attachedToViewer){ 
            viewer.updateScreenSize({forceUpdateSize:true})
        }
    }
    
    render1(params={}){//viewer的preserveDrawingBuffer为false时的版本
        let needCopy, waitCopy
        if(!this.visible && !this.attachedToViewer || !this.needRender && !params.force){
            if(this.attachedToViewer ){
                needCopy = true 
            }else{ 
                return
            } 
        }
        waitCopy = this.attachedToViewer && this.needRender && !params.force//是否写入到copyBuffer。双屏时，若needRender就拷贝到copyBuffer中，双屏时就直接使用copyBuffer。 四屏时因渲染点云会每帧都渲染，所以不需要缓存。
         
        let renderer = params.renderer || this.renderer
        
        if(waitCopy){
            this.copyBuffer.setSize(params.viewport.resolution2.x, params.viewport.resolution2.y)
            renderer.setRenderTarget(this.copyBuffer) 
        }else if(params.target){
            renderer.setRenderTarget(params.target)
        }            
        /* if(params.resize){
            this.emitResizeMsg(new THREE.Vector2(params.width,params.height, viewport:params.viewport))
        }  */
        params.clear ? params.clear() : renderer.clear(); 
         
        if(!needCopy || waitCopy){//重绘
            viewer.dispatchEvent({type: "render.begin",  viewer: this, viewport:this.viewports[0], params }); 
            Potree.Utils.setCameraLayers(this.camera, ['map','mapObjects'  , 'bothMapAndScene'  ])
            
            if(this.mapGradientBG){//渲染背景
                viewer.scene.cameraBG.layers.set(Potree.config.renderLayers.bg);
                renderer.render(viewer.scene.scene, viewer.scene.cameraBG);
            }
            
            renderer.render(this.scene, this.camera);
            renderer.render(viewer.scene.scene, this.camera);
            
            //测量线等
            //params.renderOverlay && params.renderOverlay( $.extend({}, params, { isMap:true }))
             
            renderer.setRenderTarget(params.target||null)
        } 
                     
        if(needCopy || waitCopy){//使用缓存   ----当viewer的preserveDrawingBuffer为false的话，使用buffer
            this.copyPass.render(null,null, null, renderer, params.target||null, this.copyBuffer)
        }  
        this.needRender = false
        return true
    }
    
    
    
    
    //拆成两次渲染，一个地图一个其他物体，且地图渲染后保存在buffer中，只有当地图变化后才重渲染。 
    render(params={}){ 
    
        if(!this.visible && !this.attachedToViewer || !this.needRender && !params.force){  //注意：mapViewer.needRender的权重高于它的viewport的needRender，也就是说，当attachedToViewer时，viewer即使needRender， mapViewer也不一定会渲染。
            return 
        } 
        viewer.addTimeMark('mapRender','start') 
        let renderer = params.renderer || this.renderer
         
        if(this.mapChanged){  //渲染地图背景
            renderer.setRenderTarget(this.copyBuffer) 
            params.clear ? params.clear() : renderer.clear(); 
            
            if(this.mapGradientBG){//渲染背景
                viewer.scene.cameraBG.layers.set(Potree.config.renderLayers.bg);
                renderer.render(viewer.scene.scene, viewer.scene.cameraBG);
            } 
            Potree.Utils.setCameraLayers(this.camera, ['map'])
            renderer.render(this.scene, this.camera);
            
            params.renderBG && params.renderBG(this.viewports[0])
            
            this.mapChanged = false
            renderer.setRenderTarget(params.target||null) 
        }
        
        params.clear ? params.clear() : renderer.clear(); 
        this.copyPass.render(null,null, null,renderer, params.target||null, this.copyBuffer) //拷贝地图背景
        renderer.clearDepth(); //防止地图遮挡其他物体
        
        
        
        //绘制其他物体
        Potree.Utils.setCameraLayers(this.camera, ['mapObjects'  , 'bothMapAndScene'  ])
        viewer.dispatchEvent({type: "render.begin",  viewer: this, viewport:this.viewports[0], params }); 
        renderer.render(this.scene, this.camera);
        this.attachedToViewer || renderer.render(viewer.scene.scene, this.camera); //类同renderOverlay
        
           
        renderer.setRenderTarget(null)
    
        this.needRender = false
        
		viewer.addTimeMark('mapRender','end')
        
        return true      
    }

    
    
    
     
    
}
/* 
    渲染顺序：
        地图 
        背景Overlay
        地图scene的物体，如cursor、 marker
        点云（如果有）
        overlay，两层：第一层：viewer的scene中bothMapAndScene的如reticule. 第二层：如测量线（attachToMainViewer时才渲染）
        
         
*/
//本地调试地图白屏是因为代码自动更新了 但没刷新