8.8.3.39 IfcSphere
8.8.3.39.1 Semantic definition
The IfcSphere is a Construction Solid Geometry (CSG) 3D primitive. It is a solid where all points at the surface have the same distance from the center point. The inherited Position attribute defines the IfcAxisPlacement3D and provides:
- SELF\IfcCsgPrimitive3D.Position: The location and orientation of the axis system for the primitive.
- SELF\IfcCsgPrimitive3D.Position.Location: The center of the sphere.
- SELF\IfcCsgPrimitive3D.Position.Position[3]: The z axis points at its positive direction towards the north pole, and by its negative directions towards the south pole.
Texture Use Definition
Textures are aligned facing upright with origin at the back (+Y direction) revolving counter-clockwise. Textures are stretched or repeated to the extent of the circumference at the equator according to RepeatS and RepeatT.
Figure 8.8.3.39.B illustrates default texture mapping with a clamped texture (RepeatS=False and RepeatT=False). The image on the left shows the texture where the S axis points to the right and the T axis points up. The image on the right shows the texture applied to the geometry where the X axis points back to the right, the Y axis points back to the left, and the Z axis points up.
| Side | Normal | Origin X | Origin Y | Origin Z | S Axis | T Axis |
|---|---|---|---|---|---|---|
| Side | +Y | 0 | +Radius | 0 | (-X, then curving counter-clockwise) | (+Z, then curving towards top) |
8.8.3.39.2 Entity inheritance
-
- IfcCsgPrimitive3D
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.39.3 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. |
|
| IfcCsgPrimitive3D (2) | |||
| 1 | Position | IfcAxis2Placement3D |
The placement coordinate system to which the parameters of each individual CSG primitive apply. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this geometric representation item, it is always 3. |
| Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
| IfcSphere (1) | |||
| 2 | Radius | IfcPositiveLengthMeasure |
The radius of the sphere. |
8.8.3.39.4 Formal representation
ENTITY IfcSphere
SUBTYPE OF (IfcCsgPrimitive3D);
Radius : IfcPositiveLengthMeasure;
END_ENTITY;