1 Definition
Position and Orientation of an Object, e.g., a Virtual Human in a Virtual Environment.
2 Functional Requirements
The static subset of Spatial Attitude.
3 Syntax
https://schemas.mpai.community/OSD/V1.1/data/SpatialAttitude.json
4 Semantics
Table 1 provides the semantics of the components of Point of View. The following should be noted:
- Each of Position, Velocity, and Acceleration is provided either in Cartesian (X,Y,Z) or Spherical (r,φ,θ) Coordinates.
- The Euler angles are indicated by (α,β,γ).
Table 1 – Semantics of Point of View
| Header | N1 Bytes | Point of View Data Type header | |||||||||
| · Standard-Point of View | 9 Bytes | The characters “OSD-OSA-V” | |||||||||
| · Version | N2 Bytes | Major version – 1 or 2 characters | |||||||||
| · Dot-separator | 1 Byte | The character “.” | |||||||||
| · Subversion | N3 Bytes | Minor version – 1 or 2 characters | |||||||||
| ObjectPointOfViewID | N4 Bytes | Identifier of Object Point of View. | |||||||||
| General | |||||||||||
| · CoordType | bit 0 | 0: Cartesian, 1: Spherical | |||||||||
| · ObjectType | bit 1-2 | 00: Digital Human
01: Generic 10 and 11: reserved |
|||||||||
| · MediaType | bit 3-5 | 000: Audio; 001: Visual; 010: Audio-Visual; 011: Haptic; 100: Smell; 101: RADAR; 110 LiDAR; 111: Ultrasound. | |||||||||
| · Precision | bit 6 | 0: single precision; 1: double precision | |||||||||
| · Reserved | bit 7 | reserved | |||||||||
| · PointOfViewMask | 2 Bytes | Vector of booleans
|
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| Position and Orientation | |||||||||||
| · CartPosition (X,Y,Z) | 12/24 Bytes | Array (in metres) | |||||||||
| · SpherPosition (r,φ,θ) | 12/24 Bytes | Array (in metres and degrees) | |||||||||
| · Orient (α,β,γ) | 12/24 Bytes | Array (in degrees) | |||||||||
| Errors | |||||||||||
| · ErrCartPosition | N5 Bytes | Err/CartPosition*100 | |||||||||
| · ErrSpherPosition | N6 Bytes | Err/SpherPosition*100 | |||||||||
| · ErrOrientation | N7 Bytes | Err/Orientation*100 | |||||||||
| DescrMetadata | N8 Bytes | Descriptive Metadata | |||||||||
5 Data Types
Object Types, Media Types, and Coordinate Types are required.
6 To Respondents
Respondents are requested to comment on Functional Requirements and Object Type ID, Media Type ID, and Coordinate Type ID.
