Definition from IAI: An IfcLightFixtureType is a container
type that is designed for the purpose of housing one or more light emitters and
the devices that control, restrict or vary their emission.
HISTORY: New class in IFC
2x2.
Use Definitions
An IfcLightFixtureType provides for all forms of light
fixture and its usage defines the parameters for one or
more occurrences of IfcFlowTerminal.
Geometry Use Definitions
The geometric representation of an occurrence of a light fixture
(instance of IfcFlowTerminal) of a particular IfcLightFixtureType is
given by the IfcProductDefinitionShape, allowing multiple geometric
representations. Included are:
Local Placement
The local placement is defined in the supertype IfcProduct. It is
defined by a subtype of IfcObjectPlacement which can define an absolute
placement, relative placement, or grid reference, with each defining the local
coordinate system referenced by all geometric representations. The
PlacementRelTo relationship of IfcLocalPlacement, if given, shall point
to the same IfcSpatialStructureElement which is used in the
ContainedInStructure inverse attribute, or to a referenced spatial structure
element at a higher level. If the relative placement is not used, the absolute
placement is defined within the world coordinate system.
Informal propositions for local placement:
- If the LocalPlacement is specified, then all aggregated components
should use this placement as their relative placement.
Standard Geometric Representation
Currently, the use of profiles to define the geometry for an occurrence
of this class is not supported. The standard geometric representation is
defined using explicit geometry.
B-Rep Representation
The faceted B-Rep capabilities (with or without voids) shall be
supported for B-Rep representation.
