Add terms and definitions

.antora/modules/specification/nav_introduction.adoc

@@ -3,6 +3,9 @@
 ** xref:general_docs/introduction.adoc[]
 ** xref:general_docs/scope.adoc[]
 ** xref:general_docs/normative_references.adoc[]
-** xref:general_docs/terms_and_definitions.adoc[]
 ** xref:general_docs/abbreviations.adoc[]
-** xref:general_docs/backward_compatibility.adoc[]
+** xref:general_docs/backward_compatibility.adoc[]
+* Terms and definitions
+** xref:terms_and_definitions/terms_and_definitions.adoc[]
+* Use cases
+** xref:use_cases/use_cases.adoc[]

content/terms_and_definitions/terms_and_definitions.adoc

@@ -6,7 +6,113 @@ ifndef::include-only-once[]
 include::{root-path}_config.adoc[]
 endif::[]
 
-TODO: Add terms and definitions
+3D asset::
+The combination of an object's 3D geometry, assigned material properties, and
+specific metadata.
 
-Static road network::
-Collection of connected roads enriched by static objects that do not change during runtime of a simulation.
+3D model::
+A mathematical coordinate-based representation of an object's geometrical
+surface. Material properties used for rendering purposes can be part of the 3D model. This excludes physical material properties. For a combination of 3D
+geometry and physical material properties, see 3D asset.
+
+Related terms: 3D asset, 3D environment.
+
+3D environment::
+A 3D representation of a simulated sensor's surroundings. It can consist of
+multiple 3D assets.
+
+Co-simulation::
+Simulation of multiple independent models connected with interfaces. A
+co-simulation platform handles the timing, synchronization, and data transfer between the
+individual models.
+
+Ground truth::
+Defines true static and dynamic states of objects. The true states are either
+determined by the content creator or defined by an omniscient observer, for
+example, a simulation platform.
+
+Machine perception::
+The ability of systems to interpret sensory data and to reliably detect objects
+and other road users relevant to the operation of automated driving. The data is
+used to generate situational awareness of the vehicle environment.
+
+* Source: Klaus Dietmayer, Predicting of Machine Perception for Automated Driving, 2016
+
+Material::
+A collection of material properties belonging to one entity.
+
+Material assignment::
+A mapping of material IDs to meshes of 3D models, or pixels of textures mapped to these meshes. The material ID is a unique
+pointer to a set of material properties in separate material files.
+
+Material classification::
+Standardized classification scheme that sorts materials into classes and groups
+of classes, for example, based on their physical properties.
+
+Material parameter file::
+A file in JSON format containing defined material properties according to the
+OpenMATERIAL standard.
+
+Material property::
+Denotes a physical, chemical, or geometric property of a material.
+
+Multispectral/hyperspectral material::
+Material with wavelength-specific properties that are defined for multiple spectra. 
+
+Multispectral material shows up in imagery as 3-10 wider bands.
+Hyperspectral material shows hundreds of narrow bands. 
+
+Object::
+A tangible thing with defined 3D boundaries and discrete meshes. An object ID
+can be assigned.
+
+Object part::
+A segment of an object that has distinct characteristics, for example, material,
+shape, or function.
+
+Example: A car door differs from the rest of the vehicle due to its function
+to open and close.
+
+Object type::
+Class of objects with the same set of properties. Each instance of the class is
+described by the same properties, but has individual property values.
+
+Physical property::
+Denotes a characteristic of an object or material that can be measured.
+Examples: permittivity, density, index of refraction.
+
+Post rendering effect::
+Visual modification applied to graphics after initial rendering, enhancing
+appearance or realism without impairing performance.
+
+Scenario::
+A description of the behavior or temporal evolution of physical objects and
+environmental conditions on the driving infrastructure over an interval of time,
+including the movement of traffic participants or the change of environmental
+conditions.
+
+* Source: ASAM OpenSCENARIO v1.3.0 standard, 2024
+
+Signal energy propagation::
+The act of a signal traveling through the environment and potentially
+interacting with objects and particles.
+
+* Source: Linnhoff et al., Towards Serious Perception Sensor Simulation for Safety Validation of Automated Driving - A Collaborative Method to Specify Sensor Models, 2021
+
+Simulation platform::
+Application that orchestrates and runs the simulations. It can be either an
+all-in-one solution including the generation of the 3D environment or a
+co-simulation platform orchestrating a co-simulation of multiple sensor models, vehicle dynamics models, and so on.
+
+Surface normal::
+A vector that is perpendicular to a given object, surface, or geometrical
+primitive. It can be used to determine the face direction for 2D and
+3D rendering.
+
+Validation::
+A method for evaluating a simulation model's performance and accuracy by
+comparing simulated data to measured data and quantifying the differences.
+
+Vertex normal::
+A directional vector that is associated with a vertex. It represents the
+normalized average of the surrounding surface normals.