Class TIfcGeometricRepresentationSubContext_Temp

Unit

Declaration

type TIfcGeometricRepresentationSubContext_Temp = class abstract(TIfcGeometricRepresentationContext)

Description

IFC internal class IfcGeometricRepresentationSubContext-temp (not in specification, only in XSD).

Source: scene/load/ifc/castleifc_ifc_standard_types_autogenerated.inc (line 321).

Hierarchy

Show Additional Members:

Overview

Constants

Public TypeModel = 'Model';
Public TypePlan = 'Plan';
Public TypeNotDefined = 'NotDefined';

Methods

Protected function WantsGlobalId: Boolean; virtual;
Protected class function IfcClassName: String; virtual;
Public constructor Create(AOwner: TComponent); override;
Public destructor Destroy; override;
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 ContextIdentifier: TIfcLabel read FContextIdentifier write FContextIdentifier;
Published property ContextType: TIfcLabel read FContextType write FContextType;
Published property RepresentationsInContext: TIfcRepresentationList read FRepresentationsInContext;
Published property CoordinateSpaceDimension: TIfcDimensionCount read FCoordinateSpaceDimension write FCoordinateSpaceDimension;
Published property Precision: TIfcReal read FPrecision write FPrecision;
Published property WorldCoordinateSystem: TIfcAxis2Placement read FWorldCoordinateSystem write FWorldCoordinateSystem;
Published property TrueNorth: TIfcDirection read FTrueNorth write FTrueNorth;
Published property HasSubContexts: TIfcGeometricRepresentationSubContextList read FHasSubContexts;
Published property HasCoordinateOperation: TIfcCoordinateOperation read FHasCoordinateOperation write FHasCoordinateOperation;

Description

Constants

Public TypeModel = 'Model';

The following values for ContextType are limited to these 3 constants for TIfcGeometricRepresentationContext.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4816).

Public TypePlan = 'Plan';

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4817).

Public TypeNotDefined = 'NotDefined';

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4818).

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).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4785).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4786).

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 4811).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4819).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4820).

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 ContextIdentifier: TIfcLabel read FContextIdentifier write FContextIdentifier;

The optional identifier of the representation context as used within a project.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4789).

Published property ContextType: TIfcLabel read FContextType write FContextType;

The description of the type of a representation context. The supported values for context type are to be specified by implementers agreements.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4793).

Published property RepresentationsInContext: TIfcRepresentationList read FRepresentationsInContext;

All shape representations that are defined in the same representation context.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4796).

Published property CoordinateSpaceDimension: TIfcDimensionCount read FCoordinateSpaceDimension write FCoordinateSpaceDimension;

The integer dimension count of the coordinate space modeled in a geometric representation context.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4824).

Published property Precision: TIfcReal read FPrecision write FPrecision;

Value of the model precision for geometric models.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4827).

Published property WorldCoordinateSystem: TIfcAxis2Placement read FWorldCoordinateSystem write FWorldCoordinateSystem;

Establishment of the engineering coordinate system (often referred to as the world coordinate system in CAD) for all representation contexts used by the project.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4832).

Published property TrueNorth: TIfcDirection read FTrueNorth write FTrueNorth;

Direction of the true north, or geographic northing direction, relative to the underlying project coordinate system.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4835).

Published property HasSubContexts: TIfcGeometricRepresentationSubContextList read FHasSubContexts;

The set of IfcGeometricRepresentationSubContexts that refer to this IfcGeometricRepresentationContext.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4839).

Published property HasCoordinateOperation: TIfcCoordinateOperation read FHasCoordinateOperation write FHasCoordinateOperation;

Indicates conversion between coordinate systems.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4842).


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