IfcLightSourceAmbient

Natural language names
Lichtquelle - diffus
Light Source Ambient
Source de lumière ambiante
Semantic definitions at the entity
Entity definition

NOTE  Definition according to ISO 10303-46:
The light source ambient entity is a subtype of light source. It lights a surface independent of the surface's orientation and position.

NOTE  Corresponding ISO 10303 entity: light_source_ambient. Please refer to ISO/IS 10303-46:1994, p. 31 for the final definition of the formal standard.

NOTE  In addition to the attributes as defined in ISO 10303-46 the additional property from ISO/IEC 14772-1:1997 (VRML) AmbientIntensity is inherited from the supertype.

HISTORY  New entity in IFC2x, renamed and enhanced in IFC2x2.

Inherited definitions from supertypes
Entity inheritance IfcLightSource IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@AssignedItems
S[0:1]Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
X
StyledByItemIfcStyledItem
@Item
S[0:1]Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcGeometricRepresentationItem
IfcLightSource
1NameIfcLabel? The name given to the light source in presentation. X
2LightColourIfcColourRgb Definition from ISO/CD 10303-46:1992: Based on the current lighting model, the colour of the light to be used for shading. Definition from VRML97 - ISO/IEC 14772-1:1997: The color field specifies the spectral color properties of both the direct and ambient light emission as an RGB value. X
3AmbientIntensityIfcNormalisedRatioMeasure? Definition from VRML97 - ISO/IEC 14772-1:1997: The ambientIntensity specifies the intensity of the ambient emission from the light. Light intensity may range from 0.0 (no light emission) to 1.0 (full intensity). X
4IntensityIfcNormalisedRatioMeasure? Definition from VRML97 - ISO/IEC 14772-1:1997: The intensity field specifies the brightness of the direct emission from the ligth. Light intensity may range from 0.0 (no light emission) to 1.0 (full intensity). X
IfcLightSourceAmbient
Formal representations
XML Specification
 <xs:element name="IfcLightSourceAmbient" type="ifc:IfcLightSourceAmbient" substitutionGroup="ifc:IfcLightSource" nillable="true"/>
 <xs:complexType name="IfcLightSourceAmbient">
  <xs:complexContent>
   <xs:extension base="ifc:IfcLightSource"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcLightSourceAmbient
 SUBTYPE OF (IfcLightSource);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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