[FS_3DGS_MED] glTF-based Representation Formats for 3D Gaussian Splats
Proposal
We propose to include the following information in TR 26.958 under Section 4 (and a new subsection for external format analysis under Section 11), addressing SID Objective 2c:
Document the KHR_gaussian_splatting extension as the emerging industry baseline for 3DGS representation in glTF, including its attribute semantics, SH coefficient organization, backward-compatible fallback via POINTS, and extensibility mechanism.
Document the MPEG_gaussian_splatting_transport extension being developed within MPEG-I Scene Description, including progressive download, timed delivery for dynamic 4D Gaussian splat sequences, and alternative SH coefficient layouts (mpegProgressive and mpegPerChannel).
Document the two-layer architecture (Khronos semantics + MPEG transport) and its suitability for 3GPP service integration, noting the alignment with the glTF-based approach already used in TS 26.118 and TS 26.119.