1   Definition 2   Functional Requirements 3   Syntax
4   Semantics 5  Conformance Testing 6   Performance Assessment

1 Definition

A Data Type representing the spatial arrangement of the Objects in a scene.

2 Functional Requirements

Basic Scene Geometry includes:

  1. The ID of a Virtual Space where it is/will be located.
  2. The ID of the Basic Scene Geometry.
  3. The Basic Scene Space-Time info.
  4. The number of Objects in the Scene.
  5. The Object ID and Space-Time of each Object:
  6. The Rights that may be exercised on the Object.

The following Table gives the Media Type-dependent Scene Geometries.

Basic Scene Geometry name Acronym JSON
3DModel Basic Scene Geometry OSD-B3G Link
Audio Basic Scene Geometry OSD-BAG Link
Audio-Visual Basic Scene Geometry OSD-BMG Link
LiDAR Basic Scene Geometry OSD-BLG Link
Offline Map Basic Scene Geometry OSD-BOG Link
RADAR Basic Scene Geometry OSD-BRG Link
Speech Basic Scene Geometry OSD-BSG Link
Ultrasound Basic Scene Geometry OSD-BUG Link
Visual Basic Scene Geometry OSD-BVG Link

3 Syntax

https://schemas.mpai.community/OSD/V1.4/data/BasicSceneGeometry.json

4 Semantics

Label Description
Header Basic Scene Geometry Header
– Standard-BasicSceneGeometry The characters “OSD-BSG-V”
– Version Major version – 1 or 2 characters
– Dot-separator The character “.”
– Subversion Minor version – 1 or 2 characters
MInstanceID Identifier of M-Instance.
BasicSceneGeometryID Identifier of the Basic Scene Geometry.
ObjectCount Number of Objects in Basic Scene
BasicSceneSpaceTime Space and Time info of Basic Scene Geometry
BasicSceneGeometry[] Set of Basic Scene Geometry Data
– ObjectID Object ID.
– ObjectSpaceTime Object Space-Time – may supersede Object’s own Space-Time
DescrMetadata Descriptive Metadata

5  Conformance Testing

A Data instance Conforms with Basic Scene Geometry (OSD-BSG) if:

  1. The Data validates against the Scene Geometry’s JSON Schema.
  2. All Data in the Basic Scene Geometry’s JSON Schema
    1. Have the specified type
    2. Validate against their JSON Schemas
    3. Conform with their Data Qualifiers.

6  Performance Assessment