IfcCsgPrimitive3D

BACnet MVD

#### IfcCsgPrimitive3D

Natural language names

| CSG - Primitiv (3D)
| Csg Primitive3 D
| Primitive 3D Csg

##### Semantic definitions at the entity

Entity definition

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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | Position | IfcAxis2Placement3D |  | The placement coordinate system to which the parameters of each individual CSG primitive apply. | X | X
| Dim :=3 | IfcDimensionCount |  | The space dimensionality of this geometric representation item, it is always 3. | X | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

Assignment 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.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

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.

X

X

IfcGeometricRepresentationItem
IfcCsgPrimitive3D
1 | Position | IfcAxis2Placement3D |  | The placement coordinate system to which the parameters of each individual CSG primitive apply. | X | X
| Dim :=3 | IfcDimensionCount |  | The space dimensionality of this geometric representation item, it is always 3. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcCsgPrimitive3D" type="ifc:IfcCsgPrimitive3D" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
<xs:complexType name="IfcCsgPrimitive3D" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcGeometricRepresentationItem">
<xs:sequence>
<xs:element name="Position" type="ifc:IfcAxis2Placement3D" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCsgPrimitive3D
ABSTRACT SUPERTYPE OF(ONEOF(IfcBlock, IfcRectangularPyramid, IfcRightCircularCone, IfcRightCircularCylinder, IfcSphere))
SUBTYPE OF (IfcGeometricRepresentationItem);
Position : IfcAxis2Placement3D;
DERIVE
Dim : IfcDimensionCount := 3;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcBooleanOperand IfcCsgSelect

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