Organizing More than one Voxel Contents in 3DTILES_content_voxel Extension

CesiumJS
1

I’m encountering an issue while utilizing the 3DTILES_content_voxel extension. I’m attempting to organize two voxels within the tileset.json file, but Cesium fails to load, indicating an error message: “Root must have content,” despite the fact that my root node indeed lacks content. The specific voxel content is contained within the children array. How can this issue be resolved? Thanks for your assistance!

{
  "asset": {
    "version": "1.1"
  },
  "geometricError": 40.0,
  "schema": {
    "id": "voxel",
    "classes": {
      "voxel": {
        "properties": {
          "aa": {
            "type": "SCALAR",
            "componentType": "FLOAT32"
          }
        }
      }
    }
  },
  "root": {
    "boundingVolume": {
      "box": [ 1.0, 0.0, 0.0, 2.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 ]
    },
    "geometricError": 40.0,
    "refine": "REPLACE",
    "children": [
      {
        "boundingVolume": {
          "box": [ 2.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 ]
        },
        "geometricError": 32.0,
        "refine": "REPLACE",
        "content": {
          "uri": "voxel2/voxel_{level}__{x}_{y}_{z}.json",
          "extensions": {
            "3DTILES_content_voxels": {
              "dimensions": [
                4,
                4,
                4
              ],
              "class": "voxel"
            }
          }
        },
        "implicitTiling" : {
          "subdivisionScheme" : "OCTREE",
          "subtreeLevels" : 1,
          "availableLevels" : 1,
          "subtrees" : {
            "uri" : "subtrees/{level}.{x}.{y}.{z}.subtree"
          }
        }
      },
      { 
        "boundingVolume": {
          "box": [ 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 ]
        },
        "geometricError": 32.0,
        "refine": "REPLACE",
        "content": {
          "uri": "voxel1/voxel_{level}__{x}_{y}_{z}.json",
          "extensions": {
            "3DTILES_content_voxels": {
              "dimensions": [
                4,
                4,
                4
              ],
              "class": "voxel"
            }
          }
        },
        "implicitTiling" : {
          "subdivisionScheme" : "OCTREE",
          "subtreeLevels" : 1,
          "availableLevels" : 1,
          "subtrees" : {
            "uri" : "subtrees/{level}.{x}.{y}.{z}.subtree"
          }
        }
      }
    ]
  },
  "extensionsUsed": [
    "3DTILES_content_voxels"
  ],
  "extensionsRequired": [
    "3DTILES_content_voxels"
  ]
}

test-dataset.zip (2.6 KB)

2

Just to have a cross-link here: Organizing More than one Voxel Contents in 3DTILES_content_voxel Extension · Issue #773 · CesiumGS/3d-tiles · GitHub

It is not yet clear whether this is an issue of CesiumJS, or something that should be addressed on the level of the specification.