The actor select type allows a person, or an organization, or a person associated with an organization to be referenced.
NOTE Corresponds to the following entity in ISO 10303-41: person_organization_select.
HISTORY New entity in IFC Release 1.5.1
SELECT
Definition from IAI: A select type for selecting between simple measure types for reinforcement bending parameters.
HISTORY New type in IFC Release 2x4
IfcTextFontSelect allows for either a predefined text font, a text font model or an externally defined text font to be used to describe the font of a text literal. The definition of the text font model is based on W3C TR Cascading Style Sheet Version 1, whereas the definition of predefined text font is based on ISO 10303.
NOTE IfcTextFontSelect is an entity that had been adopted from ISO 10303, Industrial automation systems and integration—Product data representation and exchange, Part 46: Integrated generic resources: Visual presentation. Corresponding ISO 10303 name: font_select. Please refer to ISO/IS 10303-46:1994, p. 133 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
IFC2x3 CHANGE The select type has been renamed from IfcFontSelect.
Definition from ISO/CD 10303-46:1992: The colour entity defines a basic appearance of elements which shall be visualized in a picture.
NOTE Corresponding STEP name: colour. It has been made into a SELECT type in IFC to avoid multiple inheritance for pre defined colour. Please refer to ISO/IS 10303-46:1994, p. 138 for the final definition of the formal standard.
HISTORY New entity in IFC2x2.
IfcObjectReferenceSelect is a select type, that holds a list of resource level entities that can be used as properties within a property set.
HISTORY New select type in IFC Release 2.0.
Definition from IAI: The IfcSpaceBoundarySelect selects either an internal space for internal or external space boundaries, or an external spatial element for external space boundaries at the outer envelop of the building.
SELECTHISTORY New select type in IFC2x4.
Definition from IAI: The IfcDistributionElementSelect provides the option to either select a distribution element occurrence, IfcDistributionElement, or a distribution element type, IfcDistributionElementType.
SELECTHISTORY New select type in IFC2x4.
IfcProcessSelect provides the option to either select a process or activity occurrence, IfcProcess, or a process or activity type, IfcTypeProcess.
SELECTHISTORY New select type in IFC2x4.
IfcProductSelect provides the option to either select a product occurrence, IfcProduct, or a product type, IfcTypeProduct.
SELECTHISTORY New select type in IFC2x4.
IfcResourceSelect provides the option to either select a resource occurrence, IfcResource, or a resource type, IfcTypeResource.
SELECTHISTORY New select type in IFC2x4.
IfcDefinitionSelect provides the option to either select an object or type object IfcObjectDefinition, or a property set template or property set, IfcPropertyDefinition.
SELECTHISTORY New select type in IFC2x4.
Definition from IAI: This type definition shall be used to distinguish between a reference to an instance either of IfcStructuralItem or IfcBuildingElement. The IfcStructuralActivityAssignmentSelect type is referenced by the entity IfcRelConnectsStructuralActivity which defines the connection between activities (IfcStructuralActivity) and the loaded element.
HISTORY: New type in Release IFC2x Edition 2.
IfcCoordinateReferenceSystemSelect is a select between either the local engineering coordinate system, represented by the IfcGeometricRepresentationContext, or another coordinate reference system, represented by IfcCoordinateReferenceSystem, to be the source of a coordinate operation.
HISTORY New select type in IFC2x4.
Definition from IAI: A measure of warping stiffness. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from IAI: A measure of linear stiffness. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from IAI: A measure of rotational stiffness. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from IAI: A measure for modulus of translational subgrade reaction which expresses the translational bedding of a structural curve item per length. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from IAI: A measure for modulus of rotational subgrade reaction which expresses the rotational bedding of a structural curve item per length. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from IAI: Bedding measure which expresses the bedding of a structural face item per area. TRUE denotes infinite stiffness (rigidity). FALSE denotes no stiffness (a release). A numeric value denotes finite linear-elastic stiffness.
HISTORY: New type in IFC 2x4.
Definition from ISO/CD 10303-42:1992 This type collects together, for reference when constructing more complex models, the subtypes which have the characteristics of a shell. A shell is a connected object of fixed dimensionality d = 0; 1; or 2, typically used to bound a region. The domain of a shell, if present, includes its bounds and 0 £ X < ¥.
Shells of dimensionality 0 and 1 are not part of the current IFC release.
NOTE Corresponding ISO 10303 type: shell. Please refer to ISO/IS 10303-42:1994, p. 127 for the final definition of the formal standard. Only the select items closed_shell (IfcClosedShell) and open_shell (IfcOpenShell) have been incorporated in the current IFC release.
HISTORY New type in IFC2x.
IfcClassificationSelect enables selection of whether a classification reference is to be referenced from an external source, or whether a classification is referenced as such.
NOTE Generally, it is expected that selection will be by IfcClassificationReference to identify an individual classification notation that classifies an element in the building information model. For example an element, such as IfcTank, might be further classified by assigning an IfcClassificationReference with Identification = ""L6814"" and a ClassificationSource identifying the appropriate version of Uniclass. IfcClassification should only be selected in circumstances where there could be a need to indicate the classification system that will be used without associating a notation or reference to an individual object. This may occur for higher level objects such as IfcProject, IfcSystem, or similar. For example an IfcStructuralAnalysisModel might be classified to be applicable to a particular version of EuroCode.
HISTORY New select type in IFC2x
IFC2x4 CHANGE Select renamed from IfcClassificationNotationSelect.
Select from:
IfcClassificationReferenceSelect enables selection of whether a classification reference is a subset of another classification reference or is a top level entry of a classification source.
HISTORY: New Select Type in IFC2x
Select From:
IfcResourceObjectSelect enables selection of resource level objects that are to be related to an resource level relationship object. The use of IfcResourceObjectSelect includes the ability to assign an external reference entity (library, classification, or documentation reference) to entities within the resource level.
HISTORY New Select type in IFC2x4.
IfcLibrarySelect enables selection of whether library information is to be contained within an IFC model or is to be referenced from an external source.
HISTORY: New Select Type in IFC2x
Select From:
Generally, it is expected that selection will be IfcLibraryReference and only rarely IfcLibraryInformation. IfcLibraryInformation should only be selected in circumstances where there could be a need to indicate the libraries that will be used without making individual references. This may occur for higher level objects such as a project or building.
IfcDocumentSelect enables selection of whether document information is to be contained within an IFC model or is to be referenced from an external source.
HISTORY: New Select Type in IFC 2x
Select From:
IfcMetricValueSelect is a select type that enables selection of the data type for the value component of an IfcMetric.
HISTORY: New type in IFC Release 2.0
Select
IfcAppliedValueSelect defines the selection of whether a value (expressed as a ratio) or an amount should be used as the value for an IfcAppliedValue.
Select from:
HISTORY: New SELECT type in IFC 2x2.
Use definitions
Selecting IfcMeasureWithUnit allows the specification of both the actual figure for the value together with the currency in which the value is represented.
Selecting IfcMonetaryMeasure allows the specification only of the value, the currency being as set by the global context
Selecting IfcRatioMeasure assumes that the amount is a percentage or other REAL number. Note that if the amount is normally specified as -20%, then this figure will need to be converted to a multiplier of 0.8
IfcTimeOrRatioSelect allows a value to be selected as being either a ratio or a time measure.
HISTORY New SELECT in IFC2x4
IfcPointOrVertexPoint provides the option to either select a geometric point (IfcPoint and subtypes) within a geometric model, or a vertex with associated point coordinates (IfcVertexPoint) within a topological model.
SELECTHISTORY New select type in IFC2x Edition 3.
IfcCurveOrEdgeCurve provides the option to either select a geometric curve (IfcCurve and subtypes) within a geometric model, or a curve with associated geometry and coordinates (IfcEdgeCurve) within a topological model.
SELECTHISTORY New select type in IFC2x Edition 3.
IfcSurfaceOrFaceSurface provides the option to either select a geometric surface (IfcSurface and subtypes) within a geometric model, or a face with associated surface geometry and coordinates (IfcFaceSurface) within a topological model.
SELECTHISTORY New select type in IFC2x3.
The IfcSolidOrShell provides the option to either select a geometric volume (IfcSolidModel and subtypes) within a geometric model, or a shell (IfcClosedShell) within a topological model.
SELECTHISTORY New select type in IFC2x4.
IfcGridPlacementDirectionSelect enables the choice of defining a grid placement be either an explicit direction, or by referencing a second grid intersection to provide the direction.
SELECT
HISTORY New select type in IFC2x4.
IfcMaterialSelect provides selection of either a material definition or a material usage definition that can be assigned to an element, a resource or another entity within IFC.
SELECT
HISTORY New select in IFC 1.0
IFC2x4 CHANGE The select now includes two new abstract entities IfcMaterialDefinition and IfcMaterialUsageDefinition with upward compatibility. The use of IfcMaterialList is deprecated from IFC2x4 onwards.
Definition from ISO/CD 10303-41:1992: A unit is a physical quantity, with a value of one, which is used as a standard in terms of which other quantities are expressed.
NOTE: Select item IfcMonetaryUnit is an addition to ISO 10303-41.
NOTE: Corresponding ISO 10303 name: unit, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
SELECT
HISTORY: New type in IFC Release 1.5.1.
IfcValue is a select type for selecting between more specialised select types IfcSimpleValue, IfcMeasureValue and IfcDerivedMeasureValue.
SELECT
HISTORY New type in IFC Release 2x.
Definition from ISO/CD 10303-41:1992: A measure value is a value as defined in ISO 31-0 (clause 2).
NOTE IfcMeasureValue is a select data type for most basic measure types coming from ISO 10303-41. Select item IfcNonNegativeLengthMeasure is in addition to ISO 10303-41.
NOTE Corresponding ISO 10303 name: measure_value, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
HISTORY New type in IFC Release 1.5.1.
IFC 2x4 change: added IfcNonNegativeLengthMeasure
IfcSimpleValue is a select type for selecting between simple value types.
SELECT
HISTORY New type in IFC Release 2x.
IFC2x4 CHANGE Items IfcDateTime, IfcDate, IfcTime, IfcDuration added.
IfcDerivedMeasureValue is a select type for selecting between derived measure types.
SELECT
HISTORY New type in IFC Release 2x.
IFC2x4 change: added IfcTemperatureRateOfChangeMeasure.
The character style select allows for a selection of character styles for text. Currently only text color and background color is selectable.
NOTE Corresponding ISO 10303 name: character_style_select. Please refer to ISO/IS 10303-46:1994, p. 89 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
IFC2x3 CHANGE The SELECT item IfcTextStyleForDefinedFont replaces the old IfcColour.
The text style select allows for the selection of styles to be assigned to an annotated text. The text style determines the text model that affect the visual presentation of characters, spaces, words, and paragraphs. There are two choices:
HISTORY New type in IFC2x2.
IFC2x3 CHANGE The items within the IfcTextStyleSelect have changed to IfcTextStyleWithBoxCharacteristics and IfcTextStyleTextModel.
Definition from ISO/CD 10303-46:1992: The size select is a selection of a specific positive length measure.
Definition from ISO: The size (or width) measure value is given in the global drawing length units.
NOTE global units are defined at the single IfcProject instance, given by UnitsInContext:IfcUnitAssignment, the same units are used for the geometric representation items and for the style definitions.
NOTE Corresponding ISO 10303 name: size_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
IFC2x3 CHANGE The SELECT item IfcMeasureWithUnit has been removed from the IfcSizeSelect, the IfcRatioMeasure and IfcDescriptiveMeasure has been added.
Definition from ISO/CD 10303-46:1992: The fill style select is a selection between different fill area styles.
NOTE Corresponding ISO 10303 name: fill_style_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
The fill area style tile shape select is used to make a selection for the style of the fill area style tile.
NOTE: The IfcFillAreaStyleTileShapeSelect is an entity that had been adopted from ISO 10303, Industrial automation systems and integration—Product data representation and exchange, Part 46: Integrated generic resources: Visual presentation.
NOTE Corresponding ISO 10303 name: fill_area_style_tile_shape_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
The style assignment select is a selection of two wasy of assigning presentation styles to an IfcStyledItem.
NOTE The select type has been introduced to provide an upward compatible improvement for assigning styles to a styled items.
HISTORY New select type in IFC2x4.
Definition from ISO/CD 10303-46:1992: The presentation style select is a selection of one of many kinds of styles, a different one for each kind of geometric representation item to be styled.
NOTE Corresponding ISO 10303 name: presentation_style_Select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
IFC2x4 CHANGE The select type has been deprecated.
The symbol style select allows for the selection of styles to be assigned to an annotated symbol.
NOTE: The selection is restricted to colour within the current release of IFC
NOTE Corresponding ISO 10303 name: symbol_style_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New entity in IFC2x2.
Definition from ISO/CD 10303-46:1992: The surface style element select is a selection of the different surface styles to use in the presentation of the side of a surface.
The select type only includes the IfcSurfaceStyleRendering (which is the equivalent to surface_style_rendering) from the select type surface_style_element_select. In addition it has the IfcSurfaceStyleLighting, which holds the exact physically based lighting properties for lighting based calculation algorithms (as the opposite to the rendering based calculation), the IfcSurfaceStyleRefraction (for more advanced refraction indices) and IfcSurfaceStyleWithTextures (to allow for image textures applied to surfaces). In addition an IfcExternallyDefinedSurfaceStyle can be selected that points into an external material library.
NOTE The IfcSurfaceLightingProperties are needed for exact lighting calculation, because physically based lighting calculation algorithms need exact physically based parameters. The factors in IfcSurfaceStyleRendering lack the physical base, they are intended for rendering calculations, but a lighting calculation based software cannot use these values.
NOTE: Corresponding ISO 10303 type: surface_style_element_select. Please refer to ISO/IS 10303-46:1994, p. 85 for the final definition of the formal standard.
HISTORY: New Select type in IFC2x2.
The IfcColourOrFactor enables the selection of either a RGB colour value or a scalar factor value for the use as values of the reflectance components.
HISTORY: New type in IFC2x2.
The IfcSpecularHighlightSelect defines the selectable types of value for specular highlight sharpness.
NOTE: The two select types relate to the different ways to specifiy the sharpness (or shininess) of the specular part of the reflectance equation. It relates to the attributes:For each surface side style only one of the two methods is needed for calculating the specular part of the equation.
- in ISO10303-46 the attribute specular_exponent is given
- in VRML97 the attribute shininess is given
HISTORY: New type in IFC2x2.
Definition from ISO/CD 10303-46:1992: The curve font or scaled curve font select is a selection of either a curve font style select (being either a predefined curve font or an explicitly defined curve font) or a curve style font and scaling.
NOTE Corresponding ISO 10303 name: curve_font_or_scaled_curve_font_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New entity in IFC2x2.
Definition from ISO/CD 10303-46:1992: The curve style font select is a selection of a curve style font or a predefined curve style font.
NOTE Corresponding ISO 10303 name: curve_style_font_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New entity in IFC2x2.
The IfcHatchLineDistanceSelect is a selection between different ways to determine the distance and potentially start point of hatch lines, either by an offset distance length measure or by a vector.
HISTORY New type in IFC2x3.
The defined symbol select is a selection between a predefined symbol and an externally defined symbol.
NOTE Corresponding ISO 10303 name: defined_symbol_select. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.
HISTORY New type in IFC2x2.
A goniometric light gets its intensity distribution function (how much light goes in any one direction) from one of two sources: (i) an industry-standard file, (ii) from distribution data passed directly via the IfcLightIntensityDistribution.
The light distribution provides the luminous intensity distribution according to some standardized light distribution curves.
Select:
| Type | Definition |
| IfcExternalReference | Light distribution is represented by a standard photometric data file such as Eulumdat, IES, CIBSE TM14. |
| IfcLightIntensityDistribution | For representing a light distribution directly the following values needs to be given in a table like structure with column and row headings. These headings should contain the angles (C/γ or B/β ) and the table body contains the intensity values, (normally normalized to cd/Klm). The angles can be non- equidistant and the angle steps can be almost any value in the valid range, so a list of all available angles in both directions covers all cases. |
HISTORY New type in IFC2x2.
Definition from ISO/CD 10303-46:1992: The layered things type selects those things, which can be grouped in layers.
It is the collection of all those items, that are assigned to a single layer. These items are representation items or complete representations (IfcRepresentationItem, IfcRepresentation). If an IfcRepresentation is referenced, all IfcRepresentationItem within its set of Items are assigned to the same layer.
NOTE: Corresponding ISO 10303 name: layered_item. It was called layered_things in the ISO/CD version and had been renamed to layered_item in the ISO/IS final version. Please refer to ISO/IS 10303-46:1994, p. 13 for the final definition of the formal standard.
HISTORY: New type in IFC2x2.
Definition from ISO/CD 10303-42:1992: This type identifies the types of entity which may be selected as the root of a CSG tree including a single CSG primitive as a special case.
Definition from IAI: The IfcBooleanResult, and subtypes of IfcCsgPrimitive3D are defined as potential root tree expression (at IfcCsgSolid). A subtype of IfcCsgPrimitive3D marks the special case of a CSG solid solely expressed by a single primitive.
NOTE Corresponding ISO 10303-42 type: csg_select, please refer to ISO/IS 10303-42:1994, p.168 for the final definition of the formal standard.
HISTORY New Type in IFC Release 1.5.1.
Definition from ISO/CD 10303-42:1992: This select type identifies the types of entities which can occur in a geometric set.
NOTE: Corresponding ISO 10303 type: geometric_set_select. Please refer to ISO/IS 10303-42:1994, p. 169 for the final definition of the formal standard.
HISTORY: New type in IFC Release 2x.
Definition from ISO/CD 10303-42:1992: This select type identifies all those types of entities which may participate in a Boolean operation to form a CSG solid.
Definition from IAI: CSG primitives are out of scope for the current IFC Release. Only faceted B-reps, swept area solids and half space solids are available as Boolean operands. Boolean results themselves can be used as operands thus enabling nested Boolean operations.
NOTE Corresponding STEP type: boolean_operand, please refer to ISO/IS 10303-42:1994, p.167 for the final definition of the formal standard. In IFC Release 1.5.1 & 2.0 only Boolean results (IfcBooleanResult), half space solids (IfcHalfSpaceSolid), faceted B-Rep, extruded solids and revolved solids (IfcSolidModel) are defined for being valid Boolean operands.
HISTORY: New Type in IFC Release 1.5.1
Definition from ISO/CD 10303-42:1992: This select type collects together both versions of the placement as used in two dimensional or in three dimensional Cartesian space. This enables entities requiring this information to reference them without specifying the space dimensionality.
NOTE: Corresponding STEP type: axis2_placement, please refer to ISO/IS 10303-42:1994, p. 19 for the final definition of the formal standard.
HISTORY: New type in IFC Release 1.5
Definition from ISO/CD 10303-42:1992: This select type identifies the two possible ways of trimming a parametric curve; by a Cartesian point on the curve, or by a REAL number defining a parameter value within the parametric range of the curve.
NOTE Corresponding ISO 10303 type: trimming_select, please refer to ISO/IS 10303-42:1994, p. 20 for the final definition of the formal standard.
HISTORY New Type in IFC Release 1.0
Definition from ISO/CD 10303-42:1992: This type is used to identify the types of entity which can participate in vector computations.
NOTE Corresponding STEP type: vector_or_direction, please refer to ISO/IS 10303-42:1994, p. 20 for the final definition of the formal standard.
HISTORY New Type in IFC Release 1.5