This document defines a reference implementation of the concepts defined in the 3D Metadata Specification. The 3D Metadata Specification itself defines a standard format for structured metadata in 3D content in a way that is language- and format agnostic. The reference implementation described here is an implementation of these concepts:
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The Schema is a JSON-based representation of 3D Metadata Schemas that describe the structure and types of metadata
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The PropertyTable is one form of a Binary Table Format. It is a JSON-based description of how large amounts of metadata can be stored compactly in a binary form.
These serialization formats are used as a common basis for different implementations of the 3D Metadata Specification:
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3D Tiles Metadata - Assigns metadata to tilesets, tiles, and contents in 3D Tiles 1.1
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3DTILES_metadata- An extension for 3D Tiles 1.0 that assigns metadata to tilesets, tiles, and contents -
EXT_structural_metadata(glTF 2.0) — Assigns metadata to vertices, texels, and features in a glTF asset