3DTiles Terrian Builder

使用 cesium terrain builder工具制作3DTiles地形。

数据

准备某地区DEM影像，投影为EPSG:4326。

Cesium Terrain Builder Docker

拉取 docker image

docker pull tumgis/ctb-quantized-mesh

run

docker run -it --name ctb  -v "d:/docker/terrain":"/data" tumgis/ctb-quantized-mesh

CTB

gdalbuildvrt tiles.vrt bj_dem.tif

生成切片

ctb-tile -f Mesh -C -N -o terrain tiles.vrt

生成layer.json

ctb-tile -f Mesh -C -N -l -o terrain tiles.vrt

{
  "tilejson": "2.1.0",
  "name": "tiles",
  "description": "",
  "version": "1.1.0",
  "format": "quantized-mesh-1.0",
  "attribution": "",
  "schema": "tms",
  "extensions": [ "octvertexnormals" ],
  "tiles": [ "{z}/{x}/{y}.terrain?v={version}" ],
  "projection": "EPSG:4326",
  "bounds": [ 0.00, -90.00, 180.00, 90.00 ],
  "available": [
    [ { "startX": 0, "startY": 0, "endX": 1, "endY": 0 } ]
   ,[ { "startX": 3, "startY": 1, "endX": 3, "endY": 1 } ]
   ,[ { "startX": 6, "startY": 2, "endX": 6, "endY": 3 } ]
   ,[ { "startX": 12, "startY": 5, "endX": 13, "endY": 6 } ]
   ,[ { "startX": 25, "startY": 11, "endX": 26, "endY": 12 } ]
   ,[ { "startX": 51, "startY": 22, "endX": 53, "endY": 24 } ]
   ,[ { "startX": 103, "startY": 44, "endX": 106, "endY": 48 } ]
   ,[ { "startX": 206, "startY": 88, "endX": 213, "endY": 96 } ]
   ,[ { "startX": 412, "startY": 177, "endX": 426, "endY": 192 } ]
   ,[ { "startX": 824, "startY": 355, "endX": 853, "endY": 384 } ]
   ,[ { "startX": 1649, "startY": 711, "endX": 1706, "endY": 768 } ]
   ,[ { "startX": 3299, "startY": 1422, "endX": 3413, "endY": 1536 } ]
   ,[ { "startX": 6599, "startY": 2844, "endX": 6826, "endY": 3072 } ]
  ]
}

Code

CTB生成的瓦片是经过GZIP压缩的。

验证

python terrain2stl.py 0_0_0.terrain 0_0_0.stl -t

参考

1. https://github.com/tum-gis/cesium-terrain-builder-docker
2. https://github.com/ahuarte47/cesium-terrain-builder/blob/master/src/TerrainTile.cpp
3. QuantizedMesh2STL Demo