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[Installation](#installation)\r\n* [Usage](#usage)\r\n* [API](#api)\r\n* [Options Overview](#options-overview)\r\n* [CLI Wrapper Example](#cli-wrapper-example)\r\n* [Contributing](#contributing)\r\n\r\n## πŸŽ‰ Features\r\n\r\n* **πŸ”„ Preprocess Mesh Archive**: Unpacks and prepares DXF/GeoJSON mesh archives into a working directory, reprojects coordinates using Proj4 strings. πŸ—ΊοΈ\r\n* **πŸ—» Terrain Tile Generation**: Generates Cesium-compatible terrain tiles (quantized-mesh or heightmap) across specified zoom levels. πŸ“ˆ\r\n* **πŸ“ Projection Support**: Accept any Proj4-formatted CRS string for flexible coordinate transformations. ✨\r\n* **πŸ“Š Progress Callbacks**: Receive real-time progress updates (percentage or log messages). πŸ“’\r\n* **🧡 Multi-threading**: Customize worker threads for CPU-bound tasks. βš™οΈ\r\n\r\n## πŸ“₯ Installation\r\n\r\n```bash\r\nnpm install mesh-dem-to-terrain\r\n```\r\n\r\n## πŸ’» Usage\r\n\r\n```js\r\nimport { preprocess, generate } from \"mesh-dem-to-terrain/index.js\";\r\n\r\n(async () => {\r\n // Step 1: Unpack and reproject your mesh archive πŸ› οΈ\r\n await preprocess(\r\n \"D:\\\\dxf.zip\", // Path to DXF/GeoJSON archive\r\n \"D:\\\\dxf_test\", // Working directory for intermediate files\r\n console.log, // Progress callback (log messages)\r\n \"+proj=utm +zone=32 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs\" // Proj4 CRS string\r\n );\r\n\r\n // Step 2: Generate Cesium Terrain Tiles πŸŒ„\r\n await generate(\r\n \"D:\\\\dxf_test\", // Working directory from preprocess\r\n (progress) => console.log((progress * 100).toFixed(2), \"%\"), // Progress callback (percentage)\r\n { endZoom: 16, startZoom: 0, threadCount: 2 } // Options: zoom range & threads\r\n );\r\n})();\r\n```\r\n\r\n## βš™οΈ API\r\n\r\n### `preprocess(inputArchive, workDir, progressCallback, proj4String)`\r\n\r\n* **inputArchive** `(string)` – Path to a ZIP archive containing DXF, GeoJSON, or other mesh files. πŸ“‚\r\n* **workDir** `(string)` – Directory to extract and preprocess mesh data. πŸ“\r\n* **progressCallback** `(function)` – Called with log messages or progress updates. πŸ“’\r\n* **proj4String** `(string)` – Proj4-formatted CRS string for coordinate transformation. 🌍\r\n\r\n**Returns:** A promise that resolves when preprocessing is complete. βœ…\r\n\r\n### `generate(workDir, progressCallback, options)`\r\n\r\n* **workDir** `(string)` – Directory prepared by `preprocess()`. πŸ“‚\r\n* **progressCallback** `(function)` – Called with a number in \\[0,1] indicating progress. πŸ“ˆ\r\n* **options** `(object)`:\r\n\r\n * `startZoom` `(number)` – Minimum zoom level to generate (default: 0). ↗️\r\n * `endZoom` `(number)` – Maximum zoom level to generate (required). β†˜οΈ\r\n * `threadCount` `(number)` – Number of worker threads (default: number of CPU cores). 🧡\r\n\r\n**Returns:** A promise that resolves when terrain tile generation is complete. βœ…\r\n\r\n## πŸ› οΈ Options Overview\r\n\r\n| Option | Default | Description |\r\n| ------------- | ------------------ | ------------------------------------------ |\r\n| `startZoom` | `0` | Minimum zoom level for generated tiles. ↗️ |\r\n| `endZoom` | *required* | Maximum zoom level for generated tiles. β†˜οΈ |\r\n| `threadCount` | `os.cpus().length` | Number of parallel worker threads. 🧡 |\r\n\r\n## πŸ“œ CLI Wrapper Example\r\n\r\nWrap the library in a convenient CLI script:\r\n\r\n```js\r\n#!/usr/bin/env node\r\nimport path from \"path\";\r\nimport { preprocess, generate } from \"mesh-dem-to-terrain/index.js\";\r\n\r\nconst [,, archive, outDir, proj, startZ, endZ, threads] = process.argv;\r\n\r\n(async () => {\r\n // Preprocess mesh archive πŸ› οΈ\r\n await preprocess(\r\n path.resolve(archive),\r\n path.resolve(outDir),\r\n console.log,\r\n proj\r\n );\r\n\r\n // Generate terrain tiles πŸŒ„\r\n await generate(\r\n path.resolve(outDir),\r\n (p) => console.log(`${(p*100).toFixed(2)} %`),\r\n {\r\n startZoom: Number(startZ) || 0,\r\n endZoom: Number(endZ) || 16,\r\n threadCount: Number(threads) || 4\r\n }\r\n );\r\n})();\r\n```\r\n\r\n## 🀝 Contributing\r\n\r\nContributions are welcome! Please open issues or pull requests on the GitHub repository. πŸ™Œ\r\n","readmeFilename":"README.md"}