IFC 4.3.2.20240809 (IFC4X3_ADD2) under development

8.14.2.2 IfcLightDistributionCurveEnum

8.14.2.2.1 Semantic definition

There are three kinds of light distribution curves, see Figure 1.

8.14.2.2.2 Type values

Type Description
TYPE_A

Type A is basically not used. For completeness the Type A Photometry equals the Type B rotated 90° around the Z-Axis counter clockwise.
TYPE_B

Type B is sometimes used for floodlights. The B-Plane System has a horizontal axis. B-Angles are valid from -180° to +180° with B 0° at the bottom and B180°/B-180° at the top, β-Angles are valid from -90° to +90°.

B-Type
Figure 8.14.2.2.A
TYPE_C

Type C is the recommended standard system. The C-Plane system equals a globe with a vertical axis. C-Angles are valid from 0° to 360°, γ-Angles are valid from 0° (south pole) to 180° (north pole).

C-Type
Figure 8.14.2.2.B
NOTDEFINED

Not defined.
Table 8.14.2.2.C

8.14.2.2.3 Formal representation 

TYPE IfcLightDistributionCurveEnum = ENUMERATION OF
	(TYPE_A
	,TYPE_B
	,TYPE_C
	,NOTDEFINED);
END_TYPE;

8.14.2.2.4 References

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