Class TIfcRelInterferesElements

Unit

Declaration

type TIfcRelInterferesElements = class(TIfcRelConnects)

Description

This item has no description. Showing description inherited from TIfcRelConnects.

Relationship that connects objects under some criteria.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3521).

Hierarchy

Show Additional Members:

Overview

Methods

Protected function WantsGlobalId: Boolean; virtual;
Protected class function IfcClassName: String; virtual;
Protected function WantsGlobalId: Boolean; override;

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;
Published property Name: TIfcLabel read FName write FName;
Published property Description: TIfcText read FDescription write FDescription;
Published property InterferenceGeometry: TIfcConnectionGeometry read FInterferenceGeometry write FInterferenceGeometry;
Published property InterferenceType: TIfcIdentifier read FInterferenceType write FInterferenceType;
Published property ImpliedOrder: Boolean read FImpliedOrder write FImpliedOrder;
Published property InterferenceSpace: TIfcSpatialZone read FInterferenceSpace write FInterferenceSpace;

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

If True, instances of this class will have GlobalId auto-assigned at saving, and they will be saved as part of the "data" list in IFC JSON files.

Strictly following the spec, this should be only defined for TIfcRoot, because only IfcRoot has GlobalId. In reality, we need GlobalId at TIfcPersistent to load some files, and we sometimes need WantsGlobalId = True to save some files.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 52).

Protected class function IfcClassName: String; virtual;

Name for the IFC standard, used in IFC files. By default, this is just ClassName with prefix 'T' removed.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 56).

Protected function WantsGlobalId: Boolean; override;

This item has no description. Showing description inherited from TIfcPersistent.WantsGlobalId.

If True, instances of this class will have GlobalId auto-assigned at saving, and they will be saved as part of the "data" list in IFC JSON files.

Strictly following the spec, this should be only defined for TIfcRoot, because only IfcRoot has GlobalId. In reality, we need GlobalId at TIfcPersistent to load some files, and we sometimes need WantsGlobalId = True to save some files.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1656).

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;

Globally unique identifier for the object instance.

Note: Not declared as TGUID, because TGUID cannot be published, but also we don't really need it: for our purposes, this identifier is just an arbitrary string.

Note: IFC 4.3 specification puts this only at IfcRoot, not at every IFC class. But testcase https://github.com/buildingsmart-community/Community-Sample-Test-Files/blob/main/IFC%204.0.2.1%20(IFC%204)/ISO%20Spec%20archive/wall-with-opening-and-window.json (from IFC 4.0) shows this can be present at any IFC class, in particular TIfcGeometricRepresentationContext.

In fact, TIfcGeometricRepresentationContext needs to have GlobalId to be successfully saved (avoid recursively trying to serialize it) in some cases. We indicate such classes with WantsGlobalId.

IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the globalId attribute is only available to those elements that are descendent of the IfcRoot entity in the EXPRESS schema, we encourage a broader use of this globalId, to enable referencing between objects in a JSON file when useful.".

Source: scene/load/ifc/castleifc_ifc_types.inc (line 79).

Published property OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;

Information about the current ownership of that object.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1659).

Published property Name: TIfcLabel read FName write FName;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1661).

Published property Description: TIfcText read FDescription write FDescription;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1662).

Published property InterferenceGeometry: TIfcConnectionGeometry read FInterferenceGeometry write FInterferenceGeometry;

The geometric shape representation of the interference geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally).

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3541).

Published property InterferenceType: TIfcIdentifier read FInterferenceType write FInterferenceType;

Optional identifier that describes the nature of the interference.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3544).

Published property ImpliedOrder: Boolean read FImpliedOrder write FImpliedOrder;

Logical value indicating if the RelatingElement is considered a source and the RelatedElement a target (giving a formal orientation to the relation). It shall be provided in regards to InterferenceGeometry usage and InterferenceType declaration.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3549).

Published property InterferenceSpace: TIfcSpatialZone read FInterferenceSpace write FInterferenceSpace;

Optional attribute that expresses the interfering space for IfcSpatialElement occurrences.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3552).


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