8.14.3.1 IfcLightDistributionData

Donnée de distribution lumineuse
Daten der Lichtverteilung

IfcLightDistributionData defines the luminous intensity of a light source given at a particular main plane angle. It is based on some standardized light distribution curves; the MainPlaneAngle is either the

For each MainPlaneAngle (considered as being the row of a table) a list of SecondaryPlaneAngle's are given (considered to be the columns of a table). They are either the:

For each pair of MainPlaneAngle and SecondaryPlaneAngle the LuminousIntensity is provided (the unit is given by the IfcUnitAssignment referring to the LuminousIntensityDistributionUnit, normally cd/klm).

HISTORY  New entity in IFC2x2.

XSD Specification:

 <xs:element name="IfcLightDistributionData" type="ifc:IfcLightDistributionData" substitutionGroup="ifc:Entity" nillable="true"/>
 <xs:complexType name="IfcLightDistributionData">
  <xs:complexContent>
   <xs:extension base="ifc:Entity">
    <xs:attribute name="MainPlaneAngle" type="ifc:IfcPlaneAngleMeasure" use="optional"/>
    <xs:attribute name="SecondaryPlaneAngle" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcPlaneAngleMeasure"/>
       </xs:simpleType>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="LuminousIntensity" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcLuminousIntensityDistributionMeasure"/>
       </xs:simpleType>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcLightDistributionData;
MainPlaneAngle : IfcPlaneAngleMeasure;
SecondaryPlaneAngle : LIST [1:?] OF IfcPlaneAngleMeasure;
LuminousIntensity : LIST [1:?] OF IfcLuminousIntensityDistributionMeasure;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

MainPlaneAngle : The main plane angle (A, B or C angles, according to the light distribution curve chosen).
SecondaryPlaneAngle :

The list of secondary plane angles (the α, β or γ angles) according to the light distribution curve chosen.

NOTE  The SecondaryPlaneAngle and LuminousIntensity lists are corresponding lists.
LuminousIntensity : The luminous intensity distribution measure for this pair of main and secondary plane angles according to the light distribution curve chosen.

Inheritance Graph:

ENTITY IfcLightDistributionData
ENTITY IfcLightDistributionData
MainPlaneAngle : IfcPlaneAngleMeasure;
SecondaryPlaneAngle : LIST [1:?] OF IfcPlaneAngleMeasure;
LuminousIntensity : LIST [1:?] OF IfcLuminousIntensityDistributionMeasure;
END_ENTITY;

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