pnts to glb with clasification

[vkitor]

Hi,
I have a classified point cloud dataset in .pnts format.
I tried using the upgrade command to convert pnts dataset to glb, but it seems that I've lost the classification attribute in the process.

When I use the analyse tool on .glb file, it mentions classification attribute, but when I open the dataset in Cesium viewer, I get no preview when I apply the classification style.

Is there another way to convert point cloud to glb, or is this the issue with Cesium viewer?

Thank you

I did conversion using following command:
npx 3d-tiles-tools upgrade --targetVersion 1.1 -i path/to/pnts/dataset/tileset.json -o ./output/upgraded

This is the result of analyse command:

{
  "asset": {
    "generator": "glTF-Transform",
    "version": "2.0"
  },
  "accessors": [
    {
      "type": "VEC3",
      "componentType": 5126,
      "count": 8277,
      "max": [
        17.905780792236328,
        11.288053512573242,
        0.07561510056257248
      ],
      "min": [
        17.62045669555664,
        11.036800384521484,
        -0.08327221870422363
      ],
      "bufferView": 0,
      "byteOffset": 0
    },
    {
      "type": "SCALAR",
      "componentType": 5121,
      "count": 8277,
      "bufferView": 0,
      "byteOffset": 12
    }
  ],
  "bufferViews": [
    {
      "buffer": 0,
      "byteOffset": 0,
      "byteLength": 132432,
      "byteStride": 16,
      "target": 34962
    }
  ],
  "buffers": [
    {
      "byteLength": 132432
    }
  ],
  "materials": [
    {
      "pbrMetallicRoughness": {
        "metallicFactor": 0
      }
    }
  ],
  "meshes": [
    {
      "primitives": [
        {
          "attributes": {
            "POSITION": 0,
            "_CLASSIFICATION": 1
          },
          "mode": 0,
          "material": 0,
          "extensions": {
            "EXT_structural_metadata": {
              "propertyAttributes": [
                0
              ]
            }
          }
        }
      ]
    }
  ],
  "nodes": [
    {
      "rotation": [
        -0.7071067811865475,
        0,
        0,
        0.7071067811865476
      ],
      "mesh": 0
    }
  ],
  "scenes": [
    {
      "nodes": [
        0
      ]
    }
  ],
  "extensionsUsed": [
    "EXT_structural_metadata"
  ],
  "extensions": {
    "EXT_structural_metadata": {
      "schema": {
        "id": "ID_batch_table",
        "name": "Generated from batch_table",
        "classes": {
          "class_batch_table": {
            "name": "Generated from batch_table",
            "properties": {
              "Classification": {
                "name": "Classification",
                "description": "Generated from Classification",
                "type": "SCALAR",
                "componentType": "UINT8",
                "required": true
              }
            }
          }
        }
      },
      "propertyAttributes": [
        {
          "class": "class_batch_table",
          "properties": {
            "Classification": {
              "attribute": "_CLASSIFICATION"
            }
          }
        }
      ]
    }
  }
}

[vkitor]

you can find example on this link:
https://drive.google.com/drive/folders/1t4wGweyX7e3gzR1HqLJFMupLyO9rP-SX?usp=sharing

[javagl]

Thanks for providing the test data for this case.

The output includes the metadata extension, and the class_batch_table with its Classification property, suggesting that the conversion worked in principle.

I have created two tileset...json files for the PNTS and the GLB, and a small sandcastle to look at them. The style that is applied there in both cases is the following:

  currentTileset.style = new Cesium.Cesium3DTileStyle({
    color: {
      conditions: [
        ["${Classification} === 5", "color('green')"],
        ["true", "color('red')"],
      ],
    },
  });

The following is a small screengrab from this sandcastle:

One can see that in the PNTS case, the style is applied properly (all points are green). In the GLB case, all points are black initially. But... when (enabling the 3D Tiles inspector and) hovering over the content, it does display the style.

So... the information seems to be translated properly but not displayed. I have opened CesiumGS/cesium#11520 for further investigation.