Efficient coding of attributes in polygon mesh compression

A method of mesh encoding, comprising:

• generating a seam vertex queue that includes one or more UV vertices of a plurality of UV vertices of a mesh, each of the one or more UV vertices in the seam vertex queue belonging to a respective UV vertex group of a plurality of seam UV vertex groups, each of the plurality of seam UV vertex groups corresponding to a same three-dimensional (3D) vertex of the mesh in a 3D space;
• determining an initial UV vertex of the mesh based on whether one of the one or more UV vertices in the seam vertex queue includes an unvisited UV vertex;
• and
• encoding UV coordinates of the mesh based on the initial UV vertex.

A method of processing mesh data, the method comprising:

• processing a bitstream of the mesh data according to a format rule, wherein:
• the bitstream includes attribute information of a plurality of UV vertices corresponding to a mesh;
• and
• the format rule specifies that:
• a seam vertex queue that includes one or more UV vertices of the plurality of UV vertices is generated, each of the one or more UV vertices in the seam vertex queue belonging to a respective UV vertex group of a plurality of seam UV vertex groups, each of the plurality of seam UV vertex groups corresponding to a same three-dimensional (3D) vertex of the mesh in a 3D space;
• an initial UV vertex of the mesh is determined based on whether one of the one or more UV vertices in the seam vertex queue includes an unvisited UV vertex;
• and
• UV coordinates of the mesh are processed based on the initial UV vertex.