IfcLightSourceAmbient

BACnet MVD

#### 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
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@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

StyledByItem

IfcStyledItem
@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

X

IfcGeometricRepresentationItem
IfcLightSource
1 | Name | IfcLabel | ? | The name given to the light source in presentation. |  | X
2 | LightColour | IfcColourRgb |  | 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
3 | AmbientIntensity | IfcNormalisedRatioMeasure | ? | 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
4 | Intensity | IfcNormalisedRatioMeasure | ? | 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;

EXPRESS-G diagram

`

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