IfcAdvancedBrepWithVoids
1语义定义
IfcAdvancedBrepWithVoids是高级B-rep的一种专门化，其内部包含一个或多个空隙。空隙表示为闭合壳，其定义使得壳法线指向空隙。
注：根据ISO 10303-42中定义的advanced_brep_shape_presentation改编的实体。
IFC4中的新实体
非正式提议：
- 每个空壳应与外壳和其他空壳分离
- 每个空壳应封闭在外壳内，但不得封闭在任何其他空壳内。特别是外壳不在空心壳组中
- IfcManifoldSolidBrep中的每个外壳只能引用一次。
- IfcAdvancedBrep和IfcAdvanceBrepWithVoids中所有壳体的所有表面。Voids应为IfcAdvanedFace类型。
2实体继承
3实体属性
| # | 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. 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. |
|
| IfcSolidModel (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, it is always 3. |
| IfcManifoldSolidBrep (1) | |||
| 1 | Outer | IfcClosedShell |
A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid. |
| Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
| IfcAdvancedBrepWithVoids (1) | |||
| 2 | Voids | SET [1:?] OF IfcClosedShell |
No description available. |
ENTITY IfcAdvancedBrepWithVoids
SUBTYPE OF (IfcAdvancedBrep);
Voids : SET [1:?] OF IfcClosedShell;
WHERE
VoidsHaveAdvancedFaces : SIZEOF (QUERY (Vsh <* Voids |
SIZEOF (QUERY (Afs <* Vsh.CfsFaces |
(NOT ('IFC4X3.IFCADVANCEDFACE' IN TYPEOF(Afs)))
)) = 0
)) = 0;
END_ENTITY;
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标签：inverse,attribute,IfcAdvancedBrepWithVoids,SET,IfcClosedShell,ifc4x3,空壳 From： https://www.cnblogs.com/herd/p/17168265.html