IFC 4.3.2.20240512 (IFC4X3_ADD2) under development

4.1.2.6.2 Material Layer Set Usage

A material layer set can be used to model the material of a product as a set of homogeneous layers with constant thickness.

Material layer set usage defines layout at occurrences to indicate a direction and offset from the 'Axis' reference curve or the coordinate system established by the IfcExtrudedAreaSolid.Position (provided by its representation).

When the occurrence has an associated IfcObjectType, that object type may define the material layer set (no usage). In this scenario, all occurrences of that type must use that layer set.

The usage may parametrically define an 'Axis' reference curve, and a direction, offset, and extent of the layers to extend along the axis. This allows layers to slope or only extend up to a particular height.

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.

G IfcProduct IfcProduct 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1]      HasAssignments [0:?]      Nests [0:1]      IsNestedBy [0:?]      HasContext [0:1]      IsDecomposedBy [0:?]      Decomposes [0:1]      HasAssociations [0:?] 5. ObjectType [0:1]      IsDeclaredBy [0:1]      Declares [0:?]      IsTypedBy [0:1]      IsDefinedBy [0:?] 6. ObjectPlacement [0:1] 7. Representation [0:1]      ReferencedBy [0:?]      PositionedRelativeTo [0:?]      ReferencedInStructures [0:?] IfcRelAssociatesMaterial IfcRelAssociatesMaterial 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1] 5. RelatedObjects [1:?] 6. RelatingMaterial [1:1] IfcProduct:HasAssociations1->IfcRelAssociatesMaterial:RelatedObjects0 IfcRelDefinesByType IfcRelDefinesByType 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1] 5. RelatedObjects [1:?] 6. RelatingType [1:1] IfcProduct:IsTypedBy1->IfcRelDefinesByType:RelatedObjects0 IfcMaterialLayerSetUsage IfcMaterialLayerSetUsage      AssociatedTo [1:?] 1. ForLayerSet [1:1] 2. LayerSetDirection [1:1] 3. DirectionSense [1:1] 4. OffsetFromReferenceLine [1:1] 5. ReferenceExtent [0:1] IfcRelAssociatesMaterial:RelatingMaterial1->IfcMaterialLayerSetUsage:IfcMaterialLayerSetUsage0 IfcTypeProduct IfcTypeProduct 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1]      HasAssignments [0:?]      Nests [0:1]      IsNestedBy [0:?]      HasContext [0:1]      IsDecomposedBy [0:?]      Decomposes [0:1]      HasAssociations [0:?] 5. ApplicableOccurrence [0:1] 6. HasPropertySets [1:?]      Types [0:1] 7. RepresentationMaps [1:?] 8. Tag [0:1]      ReferencedBy [0:?] IfcRelDefinesByType:RelatingType1->IfcTypeProduct:IfcTypeProduct0 IfcRelAssociatesMaterial_1 IfcRelAssociatesMaterial 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1] 5. RelatedObjects [1:?] 6. RelatingMaterial [1:1] IfcTypeProduct:HasAssociations1->IfcRelAssociatesMaterial_1:RelatedObjects0 IfcMaterialLayerSet IfcMaterialLayerSet      AssociatedTo [0:?]      HasExternalReferences [0:?]      HasProperties [0:?] 1. MaterialLayers [1:?] 2. LayerSetName [0:1] 3. Description [0:1] IfcRelAssociatesMaterial_1:RelatingMaterial1->IfcMaterialLayerSet:IfcMaterialLayerSet0 IfcMaterialLayer IfcMaterialLayer      AssociatedTo [0:?]      HasExternalReferences [0:?]      HasProperties [0:?] 1. Material [0:1] 2. LayerThickness [1:1] 3. IsVentilated [0:1] Name 4. Name [0:1] 5. Description [0:1] 6. Category [0:1] 7. Priority [0:1]      ToMaterialLayerSet [1:1] IfcMaterialLayerSet:MaterialLayers1->IfcMaterialLayer:IfcMaterialLayer0 IfcMaterialLayerSetUsage:ForLayerSet1->IfcMaterialLayerSet:IfcMaterialLayerSet0 IfcLayerSetDirectionEnum_1 IfcLayerSetDirectionEnum IfcMaterialLayerSetUsage:LayerSetDirection1->IfcLayerSetDirectionEnum_1:IfcLayerSetDirectionEnum0 IfcDirectionSenseEnum IfcDirectionSenseEnum IfcMaterialLayerSetUsage:DirectionSense1->IfcDirectionSenseEnum:IfcDirectionSenseEnum0 IfcLengthMeasure_1 IfcLengthMeasure IfcMaterialLayerSetUsage:OffsetFromReferenceLine1->IfcLengthMeasure_1:IfcLengthMeasure0 IfcPositiveLengthMeasure IfcPositiveLengthMeasure IfcMaterialLayerSetUsage:ReferenceExtent1->IfcPositiveLengthMeasure:IfcPositiveLengthMeasure0 IfcMaterial IfcMaterial      AssociatedTo [0:?]      HasExternalReferences [0:?]      HasProperties [0:?] 1. Name [1:1] 2. Description [0:1] 3. Category [0:1]      HasRepresentation [0:1]      IsRelatedWith [0:?]      RelatesTo [0:1] IfcMaterialLayer:Material1->IfcMaterial:IfcMaterial0 IfcNonNegativeLengthMeasure IfcNonNegativeLengthMeasure IfcMaterialLayer:LayerThickness1->IfcNonNegativeLengthMeasure:IfcNonNegativeLengthMeasure0
Figure 4.1.2.6.2.A

General Usage

ApplicableEntity
IfcCovering
IfcPlate
IfcSlab
IfcStructuralSurfaceMember
IfcWall
Table 4.1.2.6.2.B

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