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

1      Definition

A Data Type including a collection of Basic Visual Objects.

A Visual Object can have a hierarchical structure where Visual Objects contain Basic Visual Objects and Visual Objects.

2      Functional Requirements

A Visual Object may include:

  1. ID of a Virtual Space (M-Instance) where it is or intended to be located.
  2. ID of the Visual Object.
  3. Space-Time information of the Visual Object.
  4. Basic Visual Object and Visual Objects included in the Visual Objects.
  5. Annotation data set including:
    1. Annotations
    2. Space-Times of the Annotations.
    3. Rights to perform Actions on the Visual Object.
  6. The Rights that may be exercised on the Visual Object.

Note that.

  1. A Visual Object that does not include Sub-Scenes and only one Basic Visual Object is a Basic Visual Object.
  2. The Space-Time information of a Basic Visual Object and Visual Object included in a Visual Object may be superseded by the Space-Time information of the Visual Object containing them.

3      Syntax

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

4      Semantics

Label Description
Header Visual Object Header
– Standard-VisualObject The characters “OSD-VIO-V”
– Version Major version – 1 or 2 characters
– Dot-separator The character “.”
– Subversion Minor version – 1 or 2 characters
MInstanceID Identifier of M-Instance.
VisualObjectID Identifier of the Visual Object.
VisualObjectProperty Properties of Visual Object – If any is present overrides the properties of component objects.
– MaterialProperty Object has material consistence (0=No, 1=Yes)
– GravityProperty Object is subject to gravity (0=No, 1-Yes)
VisualObjectSpaceTime Space-Time of Visual Object.
BasicVisualObjectCount Set of Parent Visual Objects.
BasicVisualObjects[] Set of Basic Visual Objects.
– SpaceTime Space Time of a Basic Visual Object in the Visual Object.
– BasicVisualObject A Basic Visual Object in the Visual Object.
VisualObjectCount Number of Visual Objects.
VisualObjects[] Set of Visual Objects.
– SpaceTime Space Time of a Visual Object in the Visual Object.
– VisualObject A Visual Object in the Visual Object
Annotations[] Set of Visual Object Annotation.
– Annotation An Annotation.
– AnnotationSpaceTime Where Annotation is attached and when it will be active.
– Rights Actions that may be performed on the Annotation
Rights Actions that may be performed on the Object.
DescrMetadata Descriptive Metadata

5     Conformance Testing

A Data instance Conforms with Visual Object (OSD-VIO) if:

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

6     Performance Assessment