IfcRevolvedAreaSolidTapered
实体定义
如果将截面沿圆弧旋转，则定义为实心锥形。横截面可沿旋转扫描从起始横截面形状变为末端横截面形状。然后连接起始和结束横截面的相应顶点。有界曲面可能有孔，这些孔将扫入实体中的孔中。
旋转轴定义为：
起点：自我\IfcSweptAreaSolid.Position.位置
方向：自我\IfcrVolvedAreaSolid.轴
旋转轴：自身\ifcRevedAreaSolid.AxisLine，通过应用1个单位的幅值从起点和方向创建。
方向：当观察旋转轴的正方向时，正角度按顺时针方向应用。
起始横截面由SELF定义\IfcSweptAreaSolid.SweptArea:
位于由SELF定义的位置坐标系的XY平面上的有界平面\IfcSweptAreaSolid.位置.P[1]和SELF\IfcSweptAreaSolid.位置.P[2]
旋转轴位于起始横截面的平面内，但不得与起始横截面的内部相交。
端部横截面由端部截面积定义：
位于位置坐标系XY平面上的有界平面，通过旋转SELF提供的起始位置坐标来定义\IfcSweptAreaSolid.位置以自定角度绕旋转轴旋转\Ifcredovedareasolid.角度.
结束横截面在拓扑上类似于起始横截面（具有相同数量的顶点和边）。
端部横截面既可以由使用不同参数值的同一参数轮廓定义，也可以通过端部横截面平面内起始轮廓的二维笛卡尔变换来定义。
实体是通过将起始横截面转换为终点横截面而生成的。一个起始面、一个端面（每个由起始和结束横截面定义）和一个或多个侧面。每个侧面是一个直纹面，由起始和结束截面的一对对应边定义。直纹曲面是在超类型IfcRevolvedAreaSolid定义的柱坐标空间中构造的。
IFC4中增加的新实体。
非正式提议：
内部镜像IfcDerivedProfileDef.运算符不得使用
Formal Propositions
| Rule | Description |
|---|---|
| CorrectProfileAssignment | The SweptArea as start profile and the EndSweptArea as end profile shall be compatible. |
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| IfcRepresentationItem | |||||
| LayerAssignment | IfcPresentationLayerAssignment @AssignedItems |
S[0:1] | Assignment of the representation item to a single or multiple layer(s). The LayerAssignmentscan override a LayerAssignments of the IfcRepresentation it is used within the list of Items. | 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. | X | |
| IfcGeometricRepresentationItem | |||||
| IfcSolidModel | |||||
| Dim :=3 |
IfcDimensionCount | [1:1] | The space dimensionality of this class, it is always 3. | X | |
| IfcSweptAreaSolid | |||||
| 1 | SweptArea | IfcProfileDef | [1:1] | The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system. | X |
| 2 | Position | IfcAxis2Placement3D | [0:1] | Position coordinate system for the resulting swept solid of the sweeping operation. The position coordinate system allows for re-positioning of the swept solid. If not provided, the swept solid remains within the position as determined by the cross section or by the directrix used for the sweeping operation. | X |
| IfcRevolvedAreaSolid | |||||
| 3 | Axis | IfcAxis1Placement | [1:1] | Axis about which revolution will take place. | X |
| 4 | Angle | IfcPlaneAngleMeasure | [1:1] | The angle through which the sweep will be made. This angle is measured from the plane of the swept area provided by the XY plane of the position coordinate system. | X |
| AxisLine :=IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(Axis.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(Axis.Z,1.0)) |
IfcLine | [1:1] | The line of the axis of revolution. | X | |
| IfcRevolvedAreaSolidTapered | |||||
| 5 | EndSweptArea | IfcProfileDef | [1:1] | X | |
EXPRESS Specification
ENTITY IfcRevolvedAreaSolidTapered
SUBTYPE OF (IfcRevolvedAreaSolid);
EndSweptArea : IfcProfileDef;
WHERE
CorrectProfileAssignment : IfcTaperedSweptAreaProfiles(SELF\IfcSweptAreaSolid.SweptArea, SELF.EndSweptArea);
END_ENTITY;
