| 1 Definition | 2 Functional Requirements | 3 Syntax |
| 4 Semantics | 5 Conformance Testing | 6 Performance Assessment |
1 Definition
A Data Type representing the arrangement of the Objects of a Scene that may include Objects and sub-scenes in a hierarchical fashion.
2 Functional Requirements
Scene Geometry may reference Objects and Scenes in a hierarchical fashion.
Scenes may be hierarchical, i.e., they may contain Objects and Scenes.
The following Table gives the Media Type-dependent Scene Geometries.
| Scene Geometry name | Acronym | JSON |
| 3DModel Scene Geometry | OSD-3SG | Link |
| Audio Scene Geometry | OSD-ASG | Link |
| Audio-Visual Scene Geometry | OSD-MSG | Link |
| LiDAR Scene Geometry | OSD-LSG | Link |
| Offline Map Scene Geometry | OSD-OSG | Link |
| RADAR Scene Geometry | OSD-RSG | Link |
| Speech Scene Geometry | OSD-SSG | Link |
| Ultrasound Scene Geometry | OSD-USG | Link |
| Visual Basic Geometry | OSD-VSG | Link |
3 Syntax
https://schemas.mpai.community/OSD/V1.4/data/SceneGeometry.json
4 Semantics
| Label | Description |
| Header | Scene Geometry Header |
| – Standard-SceneGeometry | The characters “OSD-SCG-V” |
| – Version | Major version – 1 or 2 characters |
| – Dot-separator | The character “.” |
| – Subversion | Minor version – 1 or 2 characters |
| MInstanceID | Identifier of M-Instance. |
| SceneGeometryID | Identifier of Scene Geometry. |
| SceneGeometrySpaceTime | Space and Time of Scene Geometry. |
| ObjectCount | Number of Objects in Scene. |
| Objects[] | Set of Objects. |
| – ObjectID | Qualifiers of Object. |
| – ObjectSpaceTime | Space Time of Object. |
| SubSceneCount | Number of Sub-Scenes in Scene. |
| SubScenes[] | Set of Scenes. |
| – SubSceneID | ID of Sub-Scene. |
| – SubSceneSpaceTime | Space Time of Sub-Scene. |
| DescrMetadata | Descriptive Metadata |
5 Conformance Testing
A Data instance Conforms with Scene Geometry (OSD-SCG) if:
- The Data validates against the Visual Scene Geometry’s JSON Schema.
- All Data in the Visual Scene Geometry’s JSON Schema
- Have the specified type
- Validate against their JSON Schemas
- Conform with their Data Qualifiers.