Class TIfcMaterialProperties

Unit

Declaration

type TIfcMaterialProperties = class(TIfcExtendedProperties)

Description

Set of material properties to associated material definitions.

Spec: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcMaterialProperties.htm

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5429).

Hierarchy

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Overview

Methods

Protected function WantsGlobalId: Boolean; virtual;
Protected class function IfcClassName: String; virtual;
Public constructor Create(AOwner: TComponent); override;
Public destructor Destroy; override;
Public constructor Create(AOwner: TComponent); override;
Public destructor Destroy; override;

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property HasExternalReferences: TIfcExternalReferenceRelationshipList read FHasExternalReferences;
Published property Name: TIfcIdentifier read FName write FName;
Published property Description: TIfcText read FDescription write FDescription;
Published property Properties: TIfcPropertyList read FProperties;
Published property Material: TIfcMaterialDefinition read FMaterial write FMaterial;

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).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5295).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5296).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5311).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5312).

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 HasExternalReferences: TIfcExternalReferenceRelationshipList read FHasExternalReferences;

Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5300).

Published property Name: TIfcIdentifier read FName write FName;

The name given to the set of properties.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5315).

Published property Description: TIfcText read FDescription write FDescription;

Description for the set of properties.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5318).

Published property Properties: TIfcPropertyList read FProperties;

The set of properties provided for this extended property collection.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5321).

Published property Material: TIfcMaterialDefinition read FMaterial write FMaterial;

Reference to the material definition to which the set of properties is assigned.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5434).


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