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Merge pull request #12 from MPEGGroup/dev/MPEG_GS
Support for MPEG_GS extension AHG 26/04/26
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‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/README.md‎

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‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport",
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"type": "object",
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"description": "MPEG transport and streaming extension for KHR_gaussian_splatting. Provides alternative SH coefficient layouts, progressive download signaling, timed media support, and mesh stitching.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"shEncoding": {
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"$ref": "MPEG_gaussian_splatting_transport.shEncoding.schema.json"
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},
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"stitching": {
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"$ref": "MPEG_gaussian_splatting_transport.stitching.schema.json"
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["shEncoding"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.shEncoding.mpegPerChannel.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.shEncoding.mpegPerChannel",
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"type": "object",
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"description": "SH coefficients stored as per-channel SCALAR accessors. The DC term is excluded. Each channel contains 15 values per splat for degrees 1 to 3.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"r": {
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"type": "integer",
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"description": "Accessor index for red channel coefficients (15 scalar values per splat).",
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"minimum": 0
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},
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"g": {
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"type": "integer",
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"description": "Accessor index for green channel coefficients (15 scalar values per splat).",
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"minimum": 0
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},
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"b": {
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"type": "integer",
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"description": "Accessor index for blue channel coefficients (15 scalar values per splat).",
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"minimum": 0
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["r", "g", "b"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.shEncoding.mpegProgressive.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.shEncoding.mpegProgressive",
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"type": "object",
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"description": "SH coefficients stored as degree-group SCALAR accessors. The DC term is excluded.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"first": {
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"type": "integer",
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"description": "Accessor index for degree 1 coefficients (9 scalar values per splat: 3 RGB triplets for coef 0..2).",
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"minimum": 0
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},
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"second": {
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"type": "integer",
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"description": "Accessor index for degree 2 coefficients (15 scalar values per splat: 5 RGB triplets for coef 0..4).",
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"minimum": 0
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},
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"third": {
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"type": "integer",
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"description": "Accessor index for degree 3 coefficients (21 scalar values per splat: 7 RGB triplets for coef 0..6).",
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"minimum": 0
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["first"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.shEncoding.progressive.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.shEncoding.progressive",
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"type": "object",
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"description": "Progressive ordering of accessors for incremental download.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"stages": {
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"type": "array",
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"description": "Array of progressive stages ordered from lower to higher fidelity.",
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"items": {
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"$ref": "MPEG_gaussian_splatting_transport.shEncoding.progressive.stage.schema.json"
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},
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"minItems": 1
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["stages"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.shEncoding.progressive.stage.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.shEncoding.progressive.stage",
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"type": "object",
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"description": "A progressive stage listing accessors that should be fetched together.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"accessors": {
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"type": "array",
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"description": "Array of accessor indices to fetch for this stage. An accessor is timed if and only if it carries MPEG_accessor_timed.",
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"items": {
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"type": "integer",
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"minimum": 0
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},
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"minItems": 1
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["accessors"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.shEncoding.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.shEncoding",
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"type": "object",
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"description": "Signals how SH coefficients are encoded for this splat primitive.",
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"allOf": [
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{ "$ref": "glTFProperty.schema.json" },
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{
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"if": {
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"properties": {
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"layout": { "const": "mpegProgressive" }
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}
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},
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"then": {
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"required": ["mpegProgressive"]
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}
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},
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{
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"if": {
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"properties": {
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"layout": { "const": "mpegPerChannel" }
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}
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},
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"then": {
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"required": ["mpegPerChannel"]
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}
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},
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{
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"if": {
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"properties": {
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"layout": { "const": "mpegProgressive" },
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"maxDegree": { "minimum": 2 }
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},
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"required": ["layout", "maxDegree"]
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},
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"then": {
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"properties": {
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"mpegProgressive": {
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"required": ["first", "second"]
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}
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}
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}
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}
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],
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"properties": {
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"layout": {
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"type": "string",
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"description": "Indicates the encoding mode of the SH coefficients.",
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"enum": ["khrPacked", "mpegProgressive", "mpegPerChannel"]
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},
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"maxDegree": {
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"type": "integer",
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"description": "Maximum SH degree available to the receiver.",
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"minimum": 0,
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"maximum": 3
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},
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"dcFromColor0": {
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"type": "boolean",
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"description": "If true, receivers reconstruct the degree-0 (DC) term from COLOR_0.rgb. If false, degree 0 is carried explicitly via KHR_gaussian_splatting:SH_DEGREE_0_COEF_0."
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},
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"mpegProgressive": {
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"$ref": "MPEG_gaussian_splatting_transport.shEncoding.mpegProgressive.schema.json"
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},
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"mpegPerChannel": {
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"$ref": "MPEG_gaussian_splatting_transport.shEncoding.mpegPerChannel.schema.json"
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},
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"progressive": {
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"$ref": "MPEG_gaussian_splatting_transport.shEncoding.progressive.schema.json"
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},
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"extensions": {},
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"extras": {}
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},
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"required": ["layout", "maxDegree", "dcFromColor0"]
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}

‎extensions/2.0/Vendor/MPEG_gaussian_splatting_transport/schema/MPEG_gaussian_splatting_transport.stitching.schema.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema",
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"title": "MPEG_gaussian_splatting_transport.stitching",
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"type": "object",
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"description": "Parameters to attach Gaussian splats to a 3D triangular mesh primitive.",
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"allOf": [{ "$ref": "glTFProperty.schema.json" }],
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"properties": {
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"mesh": {
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"type": "integer",
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"description": "Index of the mesh in the glTF meshes array to which the Gaussian splats are stitched.",
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"minimum": 0
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},
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"primitive": {
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"type": "integer",
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"description": "Index of the mesh primitive to which the Gaussian splats are stitched.",
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"minimum": 0
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},
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"vertices": {
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"type": "integer",
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"description": "Accessor index containing vertex indices defining splat locations on mesh vertices. Mutually exclusive with faces and weights.",
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"minimum": 0
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},
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"faces": {
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"type": "integer",
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"description": "Accessor index containing face indices defining splat locations on triangular faces. Mutually exclusive with vertices.",
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"minimum": 0
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},
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"weights": {
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"type": "integer",
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"description": "Accessor index containing barycentric weight triplets (VEC3). Required when faces is present.",
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"minimum": 0
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},
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"distances": {
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"type": "integer",
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"description": "Accessor index containing scalar distance values along the vertex or face normal.",
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"minimum": 0
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},
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"displacement": {
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"type": "integer",
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"description": "Accessor index containing 3D displacement vectors (VEC3) from the mesh surface.",
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"minimum": 0
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},
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"extensions": {},
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"extras": {}
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},
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"oneOf": [
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{
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"required": ["vertices"],
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"not": {
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"anyOf": [
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{ "required": ["faces"] },
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{ "required": ["weights"] }
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]
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}
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},
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{
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"required": ["faces", "weights"],
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"not": {
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"required": ["vertices"]
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}
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}
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]
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}

‎extensions/README.md‎

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* [MPEG_animation_timing](2.0/Vendor/MPEG_animation_timing/README.md)
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* [MPEG_audio_spatial](2.0/Vendor/MPEG_audio_spatial/README.md)
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* [MPEG_buffer_circular](2.0/Vendor/MPEG_buffer_circular/README.md)
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* [MPEG_gaussian_splatting_transport](2.0/Vendor/MPEG_gaussian_splatting_transport/README.md)
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* [MPEG_media](2.0/Vendor/MPEG_media/README.md)
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* [MPEG_mesh_linking](2.0/Vendor/MPEG_mesh_linking/README.md)
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* [MPEG_scene_dynamic](2.0/Vendor/MPEG_scene_dynamic/README.md)

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