IFC 4.3.x development

8.8.3.11 IfcCsgPrimitive3D

8.8.3.11.1 Semantic definitions at the entity

IfcCsgPrimitive3D is an abstract supertype of all three dimensional primitives used as either tree root item, or as Boolean results within a CSG solid model. All 3D CSG primitives are defined within a three-dimensional placement coordinate system.

HISTORY  New entity in IFC2x3.

8.8.3.11.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcGeometricRepresentationItem
IfcCsgPrimitive3D
1 Position IfcAxis2Placement3D The placement coordinate system to which the parameters of each individual CSG primitive apply.
Dim INVALID The space dimensionality of this geometric representation item, it is always 3.

8.8.3.11.2 Entity inheritance

dot_inheritance IfcCsgPrimitive3D_children 4 more... IfcCsgPrimitive3D IfcCsgPrimitive3D IfcCsgPrimitive3D_children->IfcCsgPrimitive3D IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcCsgPrimitive3D->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.8.3.11.3 Formal representations

ENTITY IfcCsgPrimitive3D
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcBlock
	,IfcRectangularPyramid
	,IfcRightCircularCone
	,IfcRightCircularCylinder
	,IfcSphere))
 SUBTYPE OF (IfcGeometricRepresentationItem);
	Position : IfcAxis2Placement3D;
 DERIVE
	 Dim : IfcDimensionCount := 3;
END_ENTITY;