Class TIfcRelAdheresToElement

Description

Hierarchy

Methods

Properties

Unit

CastleIfc

Declaration

type TIfcRelAdheresToElement = class(TIfcRelDecomposes)

Description

Relationship between an element and one to many surface feature elements that adhere to the surface of the element.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3657).

Hierarchy

TObject
TPersistent
TComponent
TIfcPersistent
TIfcRoot
TIfcRelationship
TIfcRelDecomposes
TIfcRelAdheresToElement

Show Additional Members: Inherited Protected

Overview

Methods

Protected	`class function IfcClassName: String; virtual;`
Protected	`function WantsGlobalId: Boolean; override;`
Public	`constructor Create(AOwner: TComponent); override;`
Public	`destructor Destroy; 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 RelatingElement: TIfcElement read FRelatingElement write FRelatingElement;`

Description

Methods

Protected class function IfcClassName: String; virtual;

This item is declared in ancestor TIfcPersistent.

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 is declared in ancestor TIfcRoot.

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).

Public constructor Create(AOwner: TComponent); override;

TODO FRelatedSurfaceFeatures: TIfcSurfaceFeatureList;

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3662).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3663).

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;

This item is declared in ancestor TIfcPersistent.

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;

This item is declared in ancestor TIfcRoot.

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 is declared in ancestor TIfcRoot.

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 is declared in ancestor TIfcRoot.

This item has no description.