Information processing device and method

An information processing device comprising:

• an extraction unit configured to refer to first information about a change in a relationship of a point cloud for three-dimensional spatial regions that are independently decodable, which is stored in a file in which a bit stream of encoded data acquired by encoding the point cloud expressing an object having a three-dimensional shape is stored, and, in a case in which the relationship is static, extract data of tiles composing the three-dimensional spatial regions constructing the point cloud on the basis of second information about the three-dimensional spatial regions generated in accordance with the first information;
• and
• a decoding unit configured to decode the extracted data.

An information processing method comprising:

• referring to first information about a change in a relationship of a point cloud for three-dimensional spatial regions that are independently decodable, which is stored in a file in which a bit stream of encoded data acquired by encoding the point cloud expressing an object having a three-dimensional shape is stored, and, in a case in which the relationship is static, extracting data of tiles composing the three-dimensional spatial regions constructing the point cloud on the basis of second information about the three-dimensional spatial regions generated in accordance with the first information;
• and
• decoding the extracted data.