IfcLocalPlacement

Entity definition

An IfcLocalPlacement defines the relative placement of a product in relation to the placement of another product or the absolute placement of a product within the geometric representation context of the project.

• IfcLocalPlacement定义了一个产品相对于另一个产品的位置，或者一个产品在项目的几何表示上下文中的绝对位置。

The IfcLocalPlacement allows that an IfcProduct can be placed by this IfcLocalPlacement (through the attributeObjectPlacement) within the local coordinate system of the object placement of another IfcProduct, which is referenced by the PlacementRelTo. Rules to prevent cyclic relative placements have to be introduced on the application level.

• IfcLocalPlacement允许一个IfcProduct可以被这个IfcLocalPlacement(通过attributeObjectPlacement)放置在另一个IfcProduct的对象放置的本地坐标系统中，它被PlacementRelTo引用。必须在应用程序级别引入防止循环相对位置的规则。

If the PlacementRelTo is not given, then the IfcProduct is placed absolutely within the world coordinate system.

• 如果没有给出PlacementRelTo，则IfcProduct绝对位于世界坐标系统内。

The following conventions shall apply as default relative positions if the relative placement is used. The conventions are given for all five direct subtypes of IfcProduct, the IfcSpatialStructureElement, IfcElement, IfcAnnotation, IfcGrid, IfcPort. More detailed placement information is given at the level of subtypes of those five types mentioned.

• 如果使用相对位置，下列约定应作为默认相对位置适用。约定给出了IfcProduct的所有5个直接子类型，IfcSpatialStructureElement, IfcElement, IfcAnnotation, IfcGrid, IfcPort。在上述五种类型的子类型级别上给出了更详细的放置信息。

• For the subtypes of IfcSpatialStructureElement the following conventions apply
  • IfcSite shall be placed absolutely within the world coordinate system established by the geometric representation context of the IfcProject
  • IfcBuilding shall be placed relative to the local placement of IfcSite
  • IfcBuildingStorey shall be placed relative to the local placement of IfcBuilding

• 对于IfcSpatialStructureElement的子类型，适用以下约定
• IfcSite应绝对置于IfcProject几何表示上下文所建立的世界坐标系统内
• IfcBuilding的位置应相对于IfcSite的当地位置
• IfcBuildingStorey的位置应相对于IfcBuilding的当地位置

• For IfcGrid and IfcAnnotation the convention applies that it shall be placed relative
  • to the local placement of its container, either IfcSite, IfcBuilding, or IfcBuildingStorey
    • it should be the same container element that is referenced by the IfcRelContainedInSpatialStructure containment relationship,

• 对于IfcGrid和IfcAnnotation，公约适用于将其置于相对位置
• 或IfcSite、IfcBuilding或IfcBuildingStorey
• 它应该是被IfcRelContainedInSpatialStructure包含关系引用的相同容器元素，

• For IfcElement the convention applies that it shall be placed relative:
  • to the local placement of its container, either IfcSite, IfcBuilding, or IfcBuildingStorey
    • it should be the same container element that is referenced by the IfcRelContainedInSpatialStructure containment relationship,
  • to the local placement of the IfcElement to which it is tied by an element composition relationship
    • for features that are located relative to the main component (such as openings), as expressed by IfcRelVoidsElement and IfcRelProjectsElement;
    • for elements that fill an opening (such as doors or windows), as expressed by IfcRelFillsElement;
    • for coverings that cover the element, as expressed by IfcRelCoversBldgElements;
    • for sub components that are aggregated to the main component, as expressed by IfcRelAggregates and IfcRelNests.

• 对于IfcElement，公约适用于将其置于相对位置:
• 或IfcSite、IfcBuilding或IfcBuildingStorey
• 它应该是被IfcRelContainedInSpatialStructure包含关系引用的相同容器元素，
• 到通过元素组合关系将其绑定到的IfcElement的局部位置
• 对于位于相对于主组件(如开口)的特征，如IfcRelVoidsElement和IfcRelProjectsElement所表示的;
• 对于填充一个开口(如门或窗)的元素，如IfcRelFillsElement所表示的;
• 用于覆盖该元素的覆盖物，如IfcRelCoversBldgElements所表示的;
• 聚合到主组件的子组件，用ifcrelaggregate和ifcrel巢穴表示。

Attribute definitions

Attribute inheritance