potree-sdk/src/loader/POCLoaderNew.js

import * as THREE from "../../libs/three.js/build/three.module.js";
import {PointCloudOctreeGeometry, PointCloudOctreeGeometryNode} from "../PointCloudOctreeGeometry.js";
import {Version} from "../Version.js";
import {XHRFactory} from "../XHRFactory.js";
import {LasLazLoader} from "./LasLazLoader.js";
import {BinaryLoader} from "./BinaryLoader.js";
import {Utils} from "../utils.js";
import {PointAttribute, PointAttributes, PointAttributeTypes} from "./PointAttributes.js";

 


function parseAttributes(cloudjs){

	let version = new Version(cloudjs.version);

	const replacements = {
		"COLOR_PACKED": "rgba",
		"RGBA": "rgba",
		"INTENSITY": "intensity",
		"CLASSIFICATION": "classification",
		"GPS_TIME": "gps-time",
	};

	const replaceOldNames = (old) => {
		if(replacements[old]){
			return replacements[old];
		}else{
			return old;
		}
	};

	const pointAttributes = [];
	if(version.upTo('1.7')){
		
		for(let attributeName of cloudjs.pointAttributes){
			const oldAttribute = PointAttribute[attributeName];

			const attribute = {
				name: oldAttribute.name,
				size: oldAttribute.byteSize,
				elements: oldAttribute.numElements,
				elementSize: oldAttribute.byteSize / oldAttribute.numElements,
				type: oldAttribute.type.name,
				description: "",
			};

			pointAttributes.push(attribute);
		}

	}else{
		pointAttributes.push(...cloudjs.pointAttributes);
	}


	{
		const attributes = new PointAttributes();

		const typeConversion = {
			int8:   PointAttributeTypes.DATA_TYPE_INT8,
			int16:  PointAttributeTypes.DATA_TYPE_INT16,
			int32:  PointAttributeTypes.DATA_TYPE_INT32,
			int64:  PointAttributeTypes.DATA_TYPE_INT64,
			uint8:  PointAttributeTypes.DATA_TYPE_UINT8,
			uint16: PointAttributeTypes.DATA_TYPE_UINT16,
			uint32: PointAttributeTypes.DATA_TYPE_UINT32,
			uint64: PointAttributeTypes.DATA_TYPE_UINT64,
			double: PointAttributeTypes.DATA_TYPE_DOUBLE,
			float:  PointAttributeTypes.DATA_TYPE_FLOAT,
		};

		for(let jsAttribute of pointAttributes){
            
            if(jsAttribute.name == void 0){ //add 有的是这个，也有的不是（点云编辑页的）
                var attribute_ = PointAttribute[jsAttribute] 
                attributes.add(attribute_);
                continue;
            }
            
			const name = replaceOldNames(jsAttribute.name);
			const type = typeConversion[jsAttribute.type];
			const numElements = jsAttribute.elements;
			const description = jsAttribute.description;

			const attribute = new PointAttribute(name, type, numElements);

			attributes.add(attribute);
		}

		{
			// check if it has normals
			let hasNormals = 
				pointAttributes.find(a => a.name === "NormalX") !== undefined &&
				pointAttributes.find(a => a.name === "NormalY") !== undefined &&
				pointAttributes.find(a => a.name === "NormalZ") !== undefined;

			if(hasNormals){
				let vector = {
					name: "NORMAL",
					attributes: ["NormalX", "NormalY", "NormalZ"],
				};
				attributes.addVector(vector);
			}
		}

		return attributes;
	}

}

function lasLazAttributes(fMno){
	const attributes = new PointAttributes();

	attributes.add(PointAttribute.POSITION_CARTESIAN);
	attributes.add(new PointAttribute("rgba", PointAttributeTypes.DATA_TYPE_UINT8, 4));
	attributes.add(new PointAttribute("intensity", PointAttributeTypes.DATA_TYPE_UINT16, 1));
	attributes.add(new PointAttribute("classification", PointAttributeTypes.DATA_TYPE_UINT8, 1));
	attributes.add(new PointAttribute("gps-time", PointAttributeTypes.DATA_TYPE_DOUBLE, 1));
	attributes.add(new PointAttribute("number of returns", PointAttributeTypes.DATA_TYPE_UINT8, 1));
	attributes.add(new PointAttribute("return number", PointAttributeTypes.DATA_TYPE_UINT8, 1));
	attributes.add(new PointAttribute("source id", PointAttributeTypes.DATA_TYPE_UINT16, 1));
	//attributes.add(new PointAttribute("pointSourceID", PointAttributeTypes.DATA_TYPE_INT8, 4));


	return attributes;
}

export class POCLoader {

	static load(url, timeStamp, callback){ //add timeStamp
		try {
			let pco = new PointCloudOctreeGeometry();
            pco.timeStamp = timeStamp
            
			pco.url = url;
			let xhr = XHRFactory.createXMLHttpRequest();
			xhr.open('GET', url+'?m='+timeStamp, true);  

			xhr.onreadystatechange = function () {
				if (xhr.readyState === 4 && (xhr.status === 200 || xhr.status === 0)) {
					let fMno = JSON.parse(xhr.responseText);

					let version = new Version(fMno.version);

					// assume octreeDir is absolute if it starts with http
					if (fMno.octreeDir.indexOf('http') === 0) {
						pco.octreeDir = fMno.octreeDir;
					} else {
						pco.octreeDir = url + '/../' + fMno.octreeDir;
					}

					pco.spacing = fMno.spacing;
					pco.hierarchyStepSize = fMno.hierarchyStepSize;

					pco.pointAttributes = fMno.pointAttributes;

					let min = new THREE.Vector3(fMno.boundingBox.lx, fMno.boundingBox.ly, fMno.boundingBox.lz);
					let max = new THREE.Vector3(fMno.boundingBox.ux, fMno.boundingBox.uy, fMno.boundingBox.uz);
					let boundingBox = new THREE.Box3(min, max);
					let tightBoundingBox = boundingBox.clone();

					if (fMno.tightBoundingBox) {//这个才是真实的bounding，前面那个bounding的size是个正方体，似乎取了最长边作为边长
						tightBoundingBox.min.copy(new THREE.Vector3(fMno.tightBoundingBox.lx, fMno.tightBoundingBox.ly, fMno.tightBoundingBox.lz));
						tightBoundingBox.max.copy(new THREE.Vector3(fMno.tightBoundingBox.ux, fMno.tightBoundingBox.uy, fMno.tightBoundingBox.uz));
					}
                    
					let offset = min.clone(); //将成为点云的position，被我用作旋转中心（但在点云中不那么居中，navvis也是这样, 这样可能是为了让模型在这数据的bounding上）




					boundingBox.min.sub(offset);   //点云的真实坐标的min都是0,0,0吗（我看案例是，因绕角落旋转，也就是原点）
                    
					boundingBox.max.sub(offset);

					tightBoundingBox.min.sub(offset);
					tightBoundingBox.max.sub(offset);

                    //改
					//pco.projection = fMno.projection ||  "+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 +k_0=1 +x_0=2600000 +y_0=1200000 +ellps=bessel +towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs ",
                        //"+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" //给地图
                    
					pco.boundingBox = boundingBox;
					pco.tightBoundingBox = tightBoundingBox;
					pco.boundingSphere = boundingBox.getBoundingSphere(new THREE.Sphere());
					pco.tightBoundingSphere = tightBoundingBox.getBoundingSphere(new THREE.Sphere());
					pco.offset = offset;
					if (fMno.pointAttributes === 'LAS') {
						pco.loader = new LasLazLoader(fMno.version, "las");
						pco.pointAttributes = lasLazAttributes(fMno);
					} else if (fMno.pointAttributes === 'LAZ') {
						pco.loader = new LasLazLoader(fMno.version, "laz");
						pco.pointAttributes = lasLazAttributes(fMno);
					} else {
						pco.loader = new BinaryLoader(fMno.version, boundingBox, fMno.scale);
						pco.pointAttributes = parseAttributes(fMno);
					}

					let nodes = {};

					{ // load root
						let name = 'r';

						let root = new PointCloudOctreeGeometryNode(name, pco, boundingBox);
						root.level = 0;
						root.hasChildren = true;
						root.spacing = pco.spacing;
						if (version.upTo('1.5')) {
							root.numPoints = fMno.hierarchy[0][1];
						} else {
							root.numPoints = 0;
						}
						pco.root = root;
						pco.root.load();
						nodes[name] = root;
					}

					// load remaining hierarchy
					if (version.upTo('1.4')) {
						for (let i = 1; i < fMno.hierarchy.length; i++) {
							let name = fMno.hierarchy[i][0];
							let numPoints = fMno.hierarchy[i][1];
							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;
							//let boundingBox = POCLoader.createChildAABB(parentNode.boundingBox, index);
							let boundingBox = Utils.createChildAABB(parentNode.boundingBox, index);

							let node = new PointCloudOctreeGeometryNode(name, pco, boundingBox);
							node.level = level;
							node.numPoints = numPoints;
							node.spacing = pco.spacing / Math.pow(2, level);
							parentNode.addChild(node);
							nodes[name] = node;
						}
					}

					pco.nodes = nodes;

					callback(pco);
				}
			};

			xhr.send(null);
		} catch (e) {
			console.log("loading failed: '" + url + "'");
			console.log(e);

			callback();
		}
	}

	loadPointAttributes(mno){
		let fpa = mno.pointAttributes;
		let pa = new PointAttributes();

		for (let i = 0; i < fpa.length; i++) {
			let pointAttribute = PointAttribute[fpa[i]];
			pa.add(pointAttribute);
		}

		return pa;
	}

	createChildAABB(aabb, index){
		let min = aabb.min.clone();
		let max = aabb.max.clone();
		let size = new THREE.Vector3().subVectors(max, min);

		if ((index & 0b0001) > 0) {
			min.z += size.z / 2;
		} else {
			max.z -= size.z / 2;
		}

		if ((index & 0b0010) > 0) {
			min.y += size.y / 2;
		} else {
			max.y -= size.y / 2;
		}

		if ((index & 0b0100) > 0) {
			min.x += size.x / 2;
		} else {
			max.x -= size.x / 2;
		}

		return new THREE.Box3(min, max);
	}
}