Three-dimensional content processing methods and apparatus

An apparatus, comprising a processor configured to implement a method that causes the apparatus to:

• parse a level of detail (LoD) information of a bitstream containing three-dimensional (3D) content that is represented as one geometry sub-bitstream and one or more attribute sub-bitstreams, wherein the parsing the LoD information comprises identify a first syntax structure in the bitstream that includes multiple levels of details;
• generate, based on the LoD information, decoded information by decoding at least a portion of the geometry sub-bitstream and the one or more attribute sub-bitstreams corresponding to a desired level of detail;
• reconstruct, using the decoded information, a three-dimensional scene corresponding at least to the desired level of detail,
• wherein the bitstream conforms to a format organized according to multiple levels of details of the 3D content;
• and
• use a sample entry type field in the bitstream for a determination of whether the bitstream supports a spatial scalability functionality and for the identify the first syntax structure, wherein the first syntax structure of the bitstream with multiple levels of details comprises:
• a first structure in which a complete set of levels of the bitstream is carried in one track with sub-sample structure;
• a second structure that includes an extractor with each level of the bitstream in the one track;
• and
• a third structure that includes one or more levels of the bitstream in the one track with redundant data from lower levels.