Creating terrain tiles for a local area

[turban]

Great work!

I've tested the terrain builder and created a tileset for an area in Norway. I also had to create a layer.json file. I'm then adding the terrain with these lines:

  var terrainProvider = new Cesium.CesiumTerrainProvider({
    url: '/terrain/jotunheimen'
  });

  viewer.scene.terrainProvider = terrainProvider;

I'm getting this error:

Failed to obtain terrain tile X: 0 Y: 0 Level: 0

This tile don't exist as it's not where my data is. I'm getting the same error if I first move to my location:

viewer.scene.camera.flyTo({
  destination: Cesium.Cartesian3.fromDegrees(8.4, 61.5, 10000.0),
  duration: 3,
  complete: switchTerrain
});

Do you now how to load terrain tiles for a local area?

[homme]

I've come across this issue before: it seems that CesiumJS always needs to request the two top level tiles (0/0/0.terrain & 0/1/0.terrain). If your underlying GDAL dataset doesn't overlap the prime meridian then one of those tiles will be missing; if you're rendering Norway it makes sense that it can't find the 0/0/0.terrain tile.

I fixed this by manually copying a terrain tile that happened to be blank to the appropriate place in the terrain output (0/0/0.terrain). You could also get this tile from http://cesiumjs.org/tilesets/terrain/smallterrain/0/0/0.terrain. The only slight problem is that this latter tile will specify the existence of child tiles which won't of course exist, but this is only an optimisation issue really.

It may be worth me adding an option to ctb-tile to control the generation of this top level tile (by default).

[turban]

Thanks for your quick reply! I also read about it here:
https://groups.google.com/forum/#!msg/cesium-dev/apE83KFxYW8/1xJ5P0qlvNYJ

Do you have an empty tile (with no child tiles) that you could attach to this issue?

[homme]

No problem. The blank tile is available here.