Transmission device for point cloud data, method performed by transmission device, reception device for point cloud data and method performed by reception device

A method performed by a transmission device of point cloud data, the method comprising:

• determining whether temporal scalability is applied to point cloud data in a three-dimensional space;
• and
• generating a G-PCC file by including temporal scalability information and the point cloud data,
• wherein the temporal scalability information includes information about multiple temporal level tracks for the file, and
• wherein the information about multiple temporal level tracks is determined based on a sample entry type of a track.

A reception device of point cloud data, the reception device comprising:

• a memory;
• and
• at least one processor,
• wherein the at least one processor is configured to:
• obtain temporal scalability information of a point cloud in a three-dimensional space based on a geometry-based point cloud compression (G-PCC) file;
• and
• reconstruct the three-dimensional point cloud based on the temporal scalability information,
• wherein the temporal scalability information includes information about multiple temporal level tracks for the file, and
• wherein the information about multiple temporal level tracks is determined based on a sample entry type of a track.

A transmission device of point cloud data, the transmission device comprising:

• a memory;
• and
• at least one processor,
• wherein the at least one processor is configured to:
• determine whether temporal scalability is applied to point cloud data in a three-dimensional space;
• and
• generate a G-PCC file by including temporal scalability information and the point cloud data,
• wherein the temporal scalability information includes information about multiple temporal level tracks for the file, and
• wherein the information about multiple temporal level tracks is determined based on a sample entry type of a track.