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Property Attributes Point Cloud
An example that shows how to combine different features of the EXT_structural_metadata and 3D Tiles.
Sharing a metadata schema between glTF assets and a 3D Tiles tileset
The example uses a single metadata schema, as defined in the 3D Metadata Specification. The schema is stored in a MetadataSchema.json file, and defines a metadata class with two properties:
- an
intensityproperty, which is a single floating point value - a
classificationproperty, which is an enum withMediumVegetationandBuildingsas its values
This schema file is referred to by glTF assets that use the EXT_structural_metadata extension, and by the 3D Tiles tileset that contains these glTF assets.
Storing metadata in glTF property attributes
The glTF assets are simple point clouds, with property attributes that contain the metadata values for the schema: Each point is assigned an intensity and a classification value.
Defining statistics for the metadata values
The 3D Tiles tileset contains metadata statistics for the metadata from the glTF assets. These statistics contain, for example, the minimum and maximum intensity value, and the number of occurences for each classification value.
More information
See the 3d-tiles-samples repo for a Sandcastle and screenshot using this dataset.