8.14.3.3 IfcLightSource
ABSTRACT This definition may not be instantiated
8.14.3.3.1 Semantic definition
Definition according to ISO 10303-46: The light source entity is determined by the reflectance specified in the surface style rendering. Lighting is applied on a surface by surface basis: no interactions between surfaces such as shadows or reflections are defined. Entity adapted from light_source defined in ISO 10303-46. In addition to the attributes as defined in ISO10303-46 the following additional properties from ISO/IEC 14772-1:1997 (VRML) are added: ambientIntensity and Intensity. The attribute Name has been added as well (as it is not inherited via representation_item). New entity in IFC2x, renamed and enhanced in IFC2x2.8.14.3.3.2 Entity inheritance
-
- IfcLightSource
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.14.3.3.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcRepresentationItem (2) | |||
| LayerAssignment | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems |
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. The inverse attribute LayerAssignments has been added. The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed. |
|
| StyledByItem | SET [0:1] OF IfcStyledItem FOR Item |
Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. The inverse attribute StyledByItem has been added. |
|
| Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes | |||
| IfcLightSource (4) | |||
| 1 | Name | OPTIONAL IfcLabel |
The name given to the light source in presentation. |
| 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. |
| 3 | AmbientIntensity | OPTIONAL 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). |
| 4 | Intensity | OPTIONAL IfcNormalisedRatioMeasure |
Definition from VRML97 - ISO/IEC 14772-1:1997: The intensity field specifies the brightness of the direct emission from the light. Light intensity may range from 0.0 (no light emission) to 1.0 (full intensity). |
8.14.3.3.4 Formal representation
ENTITY IfcLightSource
ABSTRACT SUPERTYPE OF (ONEOF
(IfcLightSourceAmbient
,IfcLightSourceDirectional
,IfcLightSourceGoniometric
,IfcLightSourcePositional))
SUBTYPE OF (IfcGeometricRepresentationItem);
Name : OPTIONAL IfcLabel;
LightColour : IfcColourRgb;
AmbientIntensity : OPTIONAL IfcNormalisedRatioMeasure;
Intensity : OPTIONAL IfcNormalisedRatioMeasure;
END_ENTITY;