Capitalised Terms have the meaning defined in Table 1. Non-capitalised terms have the meaning commonly defined for the context in which they are used. For instance, Table 1 defines Object and Scene but does not define object and scene. Therefore the terms object and Object in a sentence refer to a real object and its digital representation.
A dash “-” preceding a Term in in Table 1 means the following depending on whether the font is:
- Normal, the Term in the table without a dash and preceding the one with a dash should be placed before that Term. For instance
Cue
-List
is read as a Cue List - Italic, the Term in the table without a dash and preceding the one with a dash should be placed after that Term. For instance
Descriptors
– Scene
is read as Scene Descriptors.
All MPAI-defined Terms are accessible online.
Table 1 –Terms and Definitions
| Term | Definition |
| Action | A commanded experience in the Real and/or Virtual Environment. |
| – Table | The list of commands and data needed to execute all Real and/or Virtual Actions called out in the Script. |
| Actuator | A mechanism for modulating an experience in a real or virtual world. |
| AI Module | (AIM) A processing element receiving AIM-specific Inputs and producing AIM-specific Outputs according to its Function. An AIM may be an aggregation of AIMs. |
| Association | Metadata that associates measurable elements of the Script (e.g., characters, objects, participants, operator consoles) with data sources specific to the Real and Virtual Venue, as defined by the Qualifiers in the Venue Specification. |
| Audio Object | The combination of audio data with a Qualifier providing information on the nature of the audio data. |
| Avatar | An animated 3D digital object representing a real or fictional person. |
| Biometric Data | Biological data collected from participants or performers including heart rate, electromyographic (EMG) data, skin conductance, etc. |
| Cognitive State | An estimation of the internal status of a human or avatar or a group thereof reflecting their understanding of the Environment, such as: – For a person: “Confused”, “Confident” and “Assured”. – For a group: “my team is going to lose”, or “we are winning”. |
| Controller | A manual control interface in the Real or Virtual Environment for participants, performers, or operators. |
| Cue | A Data Type that consists of specific Cue Conditions and resulting Cue Actions that are triggered when these Cue Conditions are met. |
| – Action | Actions in the Real or Virtual Environment that are triggered when Cue Conditions are met including the next Cue Point. |
| – Conditions | One or more conditions, as defined by the Performance, Participant, and Operator Descriptors and Statuses upon which the associated Cue Action is executed. |
| – List | A list of all Cues in a Script typically organised into multiple Acts, which are organised into multiple Scenes, which are organised into multiple Scene Elements that are chronological and inseparable. |
| – Point | A pointer to the current (Real, Virtual, or Mixed) Cue ID in the Script. |
| Data | Information in digital form. |
| – Format | The syntax and semantics of Data. |
| Descriptor | Digital representation of a Feature. |
| – Extraction | The function of Environment Description AIM that extracts Descriptors from data. |
| – Interpretation | The function of a Performance, Participant or Operators Status AIM that interprets and assigns a meaning to Descriptors relevant to the current Cue Conditions. |
| – Scene | A Descriptor used to describe a Scene in the Real or Virtual Environment. |
| Dome display | Wrap-around immersive display surrounding an audience, using a projection screen or LED panels, technically known as Spatial Augmented Reality. |
| Emotion | An estimation of the internal status of a human or avatar or a group thereof resulting from their interaction with the Environment, such as: For a person, “Victorious”, “Fearful” and “Angry”. For a group: “Victorious”, “Fearful” and “Disappointed” |
| Environment | A portion of a real or a virtual world. |
| Extended Reality (XR) | Any combination of Augmented Reality (AR), Virtual Reality (VR) and Mixed Reality (MR). |
| Feature | An attribute of an object or a scene in a Real or Virtual Environment. |
| Gesture | The movement of the body or part of it, such as the head, arm, hand, and finger, often a complement to a vocal utterance. |
| LiDAR Data | Data provided by LiDAR, an active time-of-flight sensor operating in the µm range – ultraviolet, visible, or near infrared light (900 to 1550 nm). |
| MoCap | Data capturing the movement of people or objects. |
| Operator | A real or virtual human operating manual control consoles, including audio, lighting, video, and show control. |
| Participant | An attendee to the live theatrical performance within the Real and Virtual Environment. |
| – Data | Data containing non-identifying information about each Participant. |
| – Data Management | The set of legal, ethical, marketing, maintenance, etc. rules guiding the acquisition, retention, and processing of Data related to and provided by Participants. |
| – Engagement Engine | Process that engages participants during or after the event allowing social interaction, commerce, and other engagement modalities. |
| Performance | The set of Performers and Objects (set pieces, staging, etc.) that are functional to theatrical production per the Script. |
| Performer | A live actor performing on the Real Environment stage or represented by an avatar in the Virtual Environment. |
| Personal Status | The combination of Cognitive State, Emotion, and Social Attitude. |
| Real Environment | The real-world space hosting the live theatrical production. |
| – Action ID | A pointer to an element of the Action Table |
| – Data In | Commands and Data input from the Real Environment. |
| – Data Out | Commands and Data output to the Real Environment. |
| – Operator Descriptors | Data pertaining to all manual control consoles within the Real Environment. |
| – Operator Status | Data interpreting all manual control consoles within the Real Environment according to the current Cue Point Conditions. |
| – Participant Descriptors | Data pertaining to Participants within the Real Environment. |
| – Participant Status | Data interpreting all Participant activities within the Real Environment relevant to the current Cue Point Conditions. |
| – Performance Descriptors | Data pertaining to the Performance within the Real Environment. |
| – Performance Status | Data interpreting all Performer and Object activities within the Real Environment relevant to the current Cue Point Conditions. |
| – Venue Specification | The specification of the physical venue and all experiential technologies including lighting (fixture type and placement, DMX profile), FX, video displays, acoustics, sound reinforcement, stage props, preset cues and participant interactive devices. |
| Script | A machine-readable functional description of the entire show performance and expected participant reactions. |
| Sensor | A mechanism capturing data from a Real or Virtual Environment. |
| Show | The live theatrical performance in both the Real and Virtual Environment. |
| – Descriptors | The ensemble of all Performance, Participant, and Operator Descriptors and Status from both the Real and Virtual Environment as required for Real and Virtual Experience Generation AIMs. |
| Social Attitude | An element of the internal status related to the way a human or avatar intends to position vis-à-vis the Environment, e.g.: For person: “Confrontational”, “Collaborative” and “Aggressive”. For groups: “Confrontational”, “Collaborative” and “Aggressive” |
| Use Case | A particular instance of the Application domain target of an MPAI Application Standard. |
| Virtual Environment | The virtual-world space hosting the live theatrical production. |
| – Action ID | A pointer to an element of the Action Table |
| – Data In | Commands and Data input from the Virtual Environment. |
| – Data Out | Commands and Data output to the Virtual Environment. |
| – Operator Descriptors | Data pertaining to all manual control consoles within the Virtual Environment. |
| – Operator Status | Data interpreting all manual control consoles within the Virtual Environment according to the current Cue Point Conditions. |
| – Participant Descriptors | Data pertaining to Participants within the Virtual Environment. |
| – ParticipantStatus | Data interpreting all Participant activities within the Virtual Environment relevant to the current Cue Point Conditions. |
| – Performance Descriptors | Data pertaining to the Performance within the Virtual Environment. |
| – Performance Status | Data interpreting all Performer and Object activities within the Virtual Environment relevant to the current Cue Point Conditions. |
| – Venue Specification | The specification of the virtual venue and all available experiential systems for the delivery of audio, video, 3D environments, preset cues, and participant interactive devices. |
| Volumetric Visual Data | A set of samples representing the value of visual 3D data represented as textured meshes, points clouds, or UV + depth. |
| XR Venue | A combination of Real or Virtual Environments addressed by MPAI-XRV Use Cases. |
