Class TIfcMaterialDefinitionRepresentation

Description

Hierarchy

Methods

Properties

Unit

CastleIfc

Declaration

type TIfcMaterialDefinitionRepresentation = class(TIfcProductRepresentation)

Description

Defines presentation information relating to IfcMaterial. It allows for multiple presentations of the same material for different geometric representation contexts.

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

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5565).

Hierarchy

TObject
TPersistent
TComponent
TIfcPersistent
TIfcProductRepresentation
TIfcMaterialDefinitionRepresentation

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;`
Public	`function BuildNode(const Mapping: TCastleIfcMapping; const ParentProduct: TIfcProduct; const LitAppearance, UnlitAppearance: TAppearanceNode): TAbstractChildNode;`

Properties

Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property Name: TIfcLabel read FName write FName;`
Published	`property Description: TIfcText read FDescription write FDescription;`
Published	`property Representations: TIfcRepresentationList read FRepresentations;`
Published	`property RepresentedMaterial: TIfcMaterial read FRepresentedMaterial write FRepresentedMaterial;`

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 TIfcProductRepresentation.

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 5213).

Public constructor Create(AOwner: TComponent); override;

This item is declared in ancestor TIfcProductRepresentation.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5215).

Public destructor Destroy; override;

This item is declared in ancestor TIfcProductRepresentation.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5216).

Public function BuildNode(const Mapping: TCastleIfcMapping; const ParentProduct: TIfcProduct; const LitAppearance, UnlitAppearance: TAppearanceNode): TAbstractChildNode;

This item is declared in ancestor TIfcProductRepresentation.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5217).

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 Name: TIfcLabel read FName write FName;

This item is declared in ancestor TIfcProductRepresentation.

The word or group of words by which the product representation is known.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5222).

Published property Description: TIfcText read FDescription write FDescription;

This item is declared in ancestor TIfcProductRepresentation.

The word or group of words that characterize the product representation.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5225).

Published property Representations: TIfcRepresentationList read FRepresentations;

This item is declared in ancestor TIfcProductRepresentation.

Contained list of representations (including shape representations).