IfcMaterialLayerSetUsage

IfcMaterialLayerSetUsage

Definition from IAI: Determines the usage of IfcMaterialLayerSet in terms of its location and orientation relative to the associated element geometry. The location of material layer set shall be compatible with the element geometry (i.e. material layers shall fit inside the element geometry).

EXAMPLE: For a cavity brick wall, the IfcMaterialLayerSet.TotalThickness shall be equal to the wall thickness (extrusion profile Y-dimension), and the layer set x-direction shall coinside with the extrusion profile positive or negative Y-direction. Thus, LayerSetDirection shall be set to AXIS2. The reference line shall be the wall axis path.

mls

ISSUE See issue and change log for changes made in IFC 2.x.

EXPRESS specification:

ENTITY IfcMaterialLayerSetUsage;

ForLayerSet

IfcMaterialLayerSet;

LayerSetDirection

IfcLayerSetDirectionEnum;

DirectionSense

IfcDirectionSenseEnum;

OffsetFromReferenceLine

IfcLengthMeasure;

END_ENTITY;

Attribute definitions:

ForLayerSet	:	Layer set to which the usage is applied.
LayerSetDirection	:	Orienation of the layer set relative to element geometry. The meaning of the value of this attribute shall be specified in the geometry use section for each element. For extruded geometric representation, direction can be given along the extrusion path (e.g. for IfcSlab) or along either of the axis of extruded profile (e.g. for IfcWall on y-axis).
DirectionSense	:	Denotion whether the layer set is oriented in positive or negative sense along the axis given by LayerSetDirection.
OffsetFromReferenceLine	:	Offset of the material layer set from reference line. The offset can be positive or negative, unless restricted for a particular building element type in its use definition or by implementer agreement. The reference line for each IfcElement is defined in use definition for the element.