A file with .usdz is a ZIP archive for the USD (Universal scene description) file format that contains and proxies for files of other formats embedded within the archive.
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glTF (GL transmission format) is a 3D file format that stores 3D model information in JSON format. The use of JSON minimizes both the size of 3D assets and the runtime processing needed to unpack and use those assets. It was adopted for the efficient transmission and loading of 3D scenes and models by applications.
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