8.9.3.1 IfcAxis1Placement
8.9.3.1.1 Semantic definition
The IfcAxis1Placement provides location and direction of a single axis.
Figure 8.9.3.1.A illustrates the definition of the IfcAxis1Placement within the parent three-dimensional coordinate system.
8.9.3.1.2 Entity inheritance
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- IfcPlacement
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.1.3 Attributes
# | Attribute | Type | Description |
---|---|---|---|
IfcRepresentationItem (2) | |||
LayerAssignment | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems |
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. |
|
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. |
|
IfcPlacement (2) | |||
1 | Location | IfcPoint |
The geometric position of a reference point, such as the center of a circle, of the item to be located. |
* | Dim | IfcDimensionCount |
This attribute is formally derived.
The space dimensionality of this class, derived from the dimensionality of the location. |
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
IfcAxis1Placement (2) | |||
2 | Axis | OPTIONAL IfcDirection |
The direction of the local Z axis. |
* | Z | IfcDirection |
This attribute is formally derived.
The normalized direction of the local Z axis. It is either identical with the Axis value, if given, or it defaults to [0.,0.,1.] |
8.9.3.1.4 Formal propositions
Name | Description |
---|---|
AxisIs3D |
The Axis when given should only reference a three-dimensional IfcDirection. |
|
|
LocationIs3D |
The Cartesian point defining the Location shall have the dimensionality of 3. |
|
|
LocationIsCP |
No description available. |
|
8.9.3.1.5 Examples
8.9.3.1.6 Formal representation
ENTITY IfcAxis1Placement
SUBTYPE OF (IfcPlacement);
Axis : OPTIONAL IfcDirection;
DERIVE
Z : IfcDirection := NVL (IfcNormalise(Axis), IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcDirection([0.0,0.0,1.0]));
WHERE
AxisIs3D : (NOT (EXISTS (Axis))) OR (Axis.Dim = 3);
LocationIs3D : SELF\IfcPlacement.Location.Dim = 3;
LocationIsCP : 'IFC4X3_DEV_20bdb3d.IFCCARTESIANPOINT' IN TYPEOF(SELF\IfcPlacement.Location);
END_ENTITY;