@dzxwind/las-loader/dist/index.js

lasLoader for three.js

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
const core_1 = require("@loaders.gl/core");
const las_1 = require("@loaders.gl/las");
const THREE = __importStar(require("three"));
// 颜色Gamma校正
function srgbToLinear(c) {
    return c <= 0.04045 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
}
class LasLoader {
    load(url, callback, customOption) {
        const options = customOption || {
            las: {
                shape: 'mesh', // 'mesh' 将点云展开成三元组；也可选 'columnar-table' 或 'arrow-table'
                skip: 1, // 每隔多少点抽样一次，skip=2 表示丢弃一半点
                fp64: false, // 是否启用 64 位浮点精度
                colorDepth: 'auto',
            },
        };
        (0, core_1.load)(url, las_1.LASLoader, options).then((lasData) => {
            const geometry = new THREE.BufferGeometry();
            geometry.setAttribute('position', new THREE.Float32BufferAttribute(lasData.attributes.POSITION.value, lasData.attributes.POSITION.size));
            if (lasData.attributes.COLOR_0) {
                // colors 通常是 Uint8Array，要归一化到 [0,1]
                const colors = lasData.attributes.COLOR_0.value.filter((_, i) => (i + 1) % 4 !== 0);
                const cols = new Float32Array(colors.length);
                for (let i = 0; i < colors.length; i++) {
                    cols[i] = srgbToLinear(colors[i] / 255);
                }
                geometry.setAttribute('color', new THREE.Float32BufferAttribute(cols, 3));
            }
            const material = new THREE.PointsMaterial({
                size: 1,
                sizeAttenuation: true,
                transparent: false,
                vertexColors: true,
                opacity: 1,
                color: new THREE.Color(0xffffff),
            });
            const mesh = new THREE.Points(geometry, material);
            callback(mesh);
            return mesh;
        });
    }
}
exports.default = LasLoader;