Cesium Quantized Mesh (.terrain)
Open BetaQuantized Mesh is Cesium's binary terrain format for streaming 3D relief into a browser: a triangle mesh with vertices quantized to 16 bits and edge indices for seamless tile stitching. On osm2cdr the export works like this: we return one valid .terrain tile for the chosen area — a regular 65x65 grid (4225 vertices, 8192 triangles). Elevations are read from the global Copernicus DEM GLO-30 (about 30 m per sample); where there is no coverage (ocean, polar latitudes) the tile honestly becomes flat at sea level. This is a single level of detail tile for a quick prototype, not a multi-level (multi-LoD) pyramid. Opens in CesiumJS, Cesium for Unreal/Unity.
主要特点
关于 Quantized Mesh 格式
Quantized Mesh is a binary terrain tile format invented for CesiumJS: a triangle mesh whose vertex coordinates are compressed to 16 bits within the tile, plus lists of edge vertices for seamless stitching with neighbours. The quantized-mesh-1.0 specification is open, but in practice the format lives inside the Cesium ecosystem.
The export exists to get the terrain of your area quickly for a 3D scene: look at the shape of the landscape, put terrain under a model in Cesium for Unreal or Unity, test an idea before rolling out a full tiling pipeline.
What you get: one .terrain tile for the chosen area — a regular grid of 65x65 samples, that is 4225 vertices and 8192 triangles, with an 88-byte header and edge indices per the specification. Elevations are taken from the global Copernicus DEM terrain model (GLO-30, about 30 meters per sample); where there is no coverage — ocean, polar latitudes — the cells are honestly filled with sea level and the tile becomes flat.
This is a tile of a single level of detail, not a worldwide tile pyramid. If you need working multi-level terrain over a large territory, build it in Cesium ion or cesium-terrain-builder on your own elevation source.
打开 Quantized Mesh 文件的程序
以下程序可以打开、编辑和处理从 OSM2CDR 导出的 Cesium Quantized Mesh (.terrain)（.terrain）文件：
格式规格
- 开放标准
- 支持 3D 坐标
- 无损（无质量损失）
- 无属性
- 输出：1 个文件
- One well-formed Quantized Mesh .terrain tile built on a 65x65 sample grid (4225 vertices, 8192 triangles) with heights from Copernicus DEM GLO-30/90; flat sea-level tile where coverage is absent.
谁在使用 Quantized Mesh 地图
如何导出 Quantized Mesh
导出后如何打开
- CesiumJS — attach the tile as your own terrain provider or load it into Sandcastle: the fastest way to see the result in a browser.
- Cesium for Unreal and Cesium for Unity — here Quantized Mesh is the native terrain source; the tile is placed into the scene as the base under buildings and objects.
- Cesium ion — if you need full multi-level terrain over a large territory: upload your own elevation source and the service will build the tile pyramid itself.
- cesium-terrain-builder — the same result on your own, on your own server, from a GeoTIFF with elevations.
- Checking the file — the tile is binary, opening it in a text editor is pointless: go by the file size and by how it landed in the scene.
Quantized Mesh 格式的热门地图
导出 Cesium Quantized Mesh (.terrain) 地图
从 OpenStreetMap 下载专业的 Quantized Mesh 地图。即时生成，任意区域。