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.
תכונות עיקריות
אודות פורמט Quantized Mesh
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.
איזו תוכנה פותחת קבצי Quantized Mesh
התוכנות והיישומים הבאים יכולים לפתוח, לערוך ולעבוד עם קבצי Cesium Quantized Mesh (.terrain) (.terrain) שיוצאו מ-OSM2CDR:
Format specifications
- Open standard
- 3D coordinates supported
- Lossless (no quality loss)
- No attributes
- Output: 1 file
- 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.
מי משתמש במפות Quantized Mesh
כיצד לייצא Quantized Mesh
איך לפתוח לאחר הייצוא
- 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.
מפות פופולריות בפורמט Quantized Mesh
קבלו ייצוא מפות בפורמט Cesium Quantized Mesh (.terrain)
הורידו מפות Quantized Mesh מקצועיות מ-OpenStreetMap. יצירה מיידית, לכל אזור.