Problems when processing 3D-Tile dataset (b3dm, tileset.json)

CesiumJS
1

I read tileset.json in template project of cesium and saw:
"root" : {
    "boundingVolume" : {
      "box" : [... ]
    },
    "geometricError" : 747.29934840236092,
    "refine" : "add",
    "content" : {
      "boundingVolume" : {
        "box" : [... ]
      },
      "url" : "data/data0.b3dm"
    },
                "children":{....
                                {
        "boundingVolume" : {
          "box" : [ ...]
        },
        "refine" : "add",
        "content" : {
          "boundingVolume" : {
            "box" : [...]
          },
          "url" : "data/data1.b3dm"
        }
      },.....}
I have these problems.

When i try to visualize one of those b3dm files by isolating it to other tileset.json or converting to .glb file, nothing showing up.

What is b3dm file in root.content.url like when the building models are from b3dm files in children.content.urls? How does it work?

How do i tile my dataset from glb/dae file to list of b3dm file. Is there any tool and if there isn't then how do i tile my dataset manually?

Any help would be appreciated.

Best regards,

2

Did you try using this tool to extract the glb: https://github.com/AnalyticalGraphicsInc/3d-tiles-tools/tree/master/tools#b3dmtoglb? It should load fine as the url of a Model object. Feel free to send me a b3dm if you are still having trouble.

The b3dm of the root tile could be anything really, but some common cases are the root tile is the lowest level-of-detail version of the buildings or the root tile is a smaller subset of the buildings and the children contain the rest of the buildings.

Is your glb/dae file a single very large file, or do you have a collection of small glbs/daes? The tiling approach will vary depending on this. The tiling tools out there are usually for converting other formats like shapefile, citygml, or geojson to 3D Tiles and not as many that take glb/dae as input.

3

Dear Sean,

The dataset is a large glb/dae file with more than 2000 buildings. Here's the link to glb/dae/ file http://bit.ly/2DhOxID.

Can you please specify how to tile the dataset and how to specify the coordinates of child tiles?

Thank you very much.