IfcLightDistributionData

Definition from IAI: The 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

- A angle; if the IfcLightDistributionCurveEnum is set to TYPE_A
- B angle; if the IfcLightDistributionCurveEnum is set to TYPE_B
- C angle; if the IfcLightDistributionCurveEnum is set to TYPE_C

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:

- α angle; if the IfcLightDistributionCurveEnum is set to TYPE_A
- β angle; if the IfcLightDistributionCurveEnum is set to TYPE_B
- γ angle; if the IfcLightDistributionCurveEnum is set to TYPE_C

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

> HISTORY: New entity in Release IFC2x Edition 2.

EXPRESS specification:

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

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;