| Definition | Functional Requirements | Syntax | Semantics | Conformance Testing | 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
A Scene Geometry instance must include:
- The Scene Geometry Header
- The ID of the Scene Geometry.
- The ID and the Space-Time information of the Objects in the Scene.
- The ID and the Space-Time information of the Sub-Scenes in the Scene.
A Scene Geometry instance may include:
- The ID of a Virtual Space (M-Instance) to which it refers.
- The ID of a U-Environment to which it refers.
- The Space-Time information of this Scene Geometry instance.
- Information about this Scene Geometry.
- Descriptive Metadata.
| 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 Scene Geometry | OSD-VSG | Link |
3 Syntax
https://schemas.mpai.community/OSD/V1.5/data/SceneGeometry.json
4 Semantics
| Label | Description |
| Header | Scene Geometry Header – Standard “OSD-SCG-Vx.y” |
| MInstanceID | Identifier of the M-Instance. |
| UEnvironment | Identifier of the U-Environment. |
| SceneGeometryID | ID of this Scene Geometry instance. |
| SceneGeometryTime | Space and Time of Scene Geometry. |
| SceneGeometrySpaceTime | Space and Time of Scene Geometry. |
| ObjectCount | Number of Objects in Scene. |
| SceneObjects[] | Set of Data related to Objects in the Scene. |
| – SceneObjectSpaceTime | Space and Time of Object in the Scene. |
| – SceneObjectQualifier | Qualifiers of the Object in the Scene. |
| SubSceneCount | Number of Sub-Scenes in Scene. |
| SubScenes[] | Set of Data related to Objects in the Scene. |
| – SubSceneSpaceTime | Space and Time of Sub-Scene in the Scene. |
| DataXMData | Information on this Scene Geometry instance. |
| DescrMetadata | Descriptive Metadata |
5 Conformance Testing
A Data instance Conforms with Scene Geometry (OSD-SCG) if:
- The Data validates against the Scene Geometry’s JSON Schema.
- All Data in the Scene Geometry’s JSON Schema
- Have the specified type
- Validate against their JSON Schemas
- Conform with their Data Qualifiers.
