Convert Geotif to Cesium and use it in Unreal (in local)

Cesium for Unreal
1

Hi,

I have tried converting a Geotif file to read it in Unreal with Cesium.

I installed:

I launched the commands:
docker run -it --name ctb -v “d: / DockerFolder / terrain”: “/ data” tumgis / ctb-quantized-mesh

I used a geotif found at this address:

I launched the commands:
ctb-tile -f Mesh -C -N -o myOutput jotunheimen.tif
ctb-tile -f Mesh -C -N -l -o myOutput jotunheimen.tif

Files are generated (.terrain of 1 to 2 KB) but when I try to display it in Unreal with the following URL, nothing is displayed (In CesiumGeoreference, I went to the coordinates given by googleMap for this place):
file: /// D: /DockerFolder/terrain/myOutput/layer.json

I tried with other Geotiff, same result.
(Note: I don’t have a raster)

Did I miss something?

2

In one of your tutorial (Adding Datasets – Cesium), i can read this:

Currently, loading local quantized-mesh terrain files using Cesium for Unreal is not supported. However, terrain assets can be loaded from any server, including localhost . To load terrain assets completely offline, consider setting up a localhost to serve the terrain. The Url field can be filled using the same steps as above with http://localhost:portNumber/terrainAsset .

Does it means that i cannot load a terrain in a local folder of my PC in Unreal ? Or does it means that i can do that but using a server ?

3

When i try to use a server with my terrain (created using Cesium Terrain Builder Docker) i have this error:

LogCesium: Warning: [2021-09-24 11:17:08.905] [warning] [TileContentFactory.cpp:74] No loader registered for tile with content type ‘application/octet-stream’ and magic value '?
LogCesium: Warning: [2021-09-24 11:17:09.109] [warning] [TileContentFactory.cpp:74] No loader registered for tile with content type ‘application/octet-stream’ and magic value '?

Actually, I don’t understand what is possible and what not to do with the Cesium plugin for Unreal.
Some documentation or forums seem contradictory.
It is possible that my lack of knowledge in the field explains my questions.

Can I load terrain (elevation and raster) with this plugin while being offline?

Is the layer.json file generated by Cesium Terrain Builder sufficient or should it be modified?
If it is possible to display my terrain, how do I add the raster to it?

1 Like
4

Hi @Gregory_S ,
I am running into the same issue and have the same questions. Any luck?

5

Hi,

It’s easy to read 3DTiles from a local disk.
Select: Source: From URL
Select: file:///C:/MyTerrains/MySubFolder/tileset.json
Add the good georeference position

The problem is to create 3DTiles. Cesium Ion can create terrain from Geotiff but you cannot download the result in your local machine.
It is possible to buy a licence from Cesium to have the converter in your local machine, but it’s very expenssive and the commercial from Cesium i had was not very cooperative to explain et present their products.

I have used an another commercial software to convert data to 3DTiles

6

Hi Greg ,

Could you please mention in which commercial app you used in order to convert the 3d tiles ?
Do they supply the flow for the process?

Thanks :pray:
Dar

7

tileset.json runs with b3dm format that can be generated from blender software

8

I wish to convert a terrain which is very large 100’s of squared kilometres.
Does blender fit the job?
I tried to convert from cdb to 3dTile but had black holes in flat views in comparison to the the terrain normal.