IFCPRESENTATIONAPPEARANCERESOURCE
The data model consists of the following:
The schema IfcPresentationAppearanceResource defines the
resources used for geometric representations and presentations of styled items.
The primary application of this resource is for presenting the annotation
occurrences of curve, text, filled area, symbol, and surfaces.
NOTE: The definitions of this
resource of the IFC model have been taken from the International Standard
10303: "Industrial automation systems and integration - Product data
representation and exchange", Part 46 "Integrated generic resources: Visual
presentation". The reference of the final international standard is ISO/IS
10303-46:1994. The IfcPresentationAppearanceResource refers to the
clause 6, "Presentation appearance" of the standard.
The definitions taken from ISO/IS 10303-46:1994 have undergone a
adaptation process, characterized by:
- adaptation of the IFC naming convention (inner majuscules and Ifc
prefix)
- adaptation of the STEP entities, where multiple inheritance or
non-exclusive inheritance (i.e. AND or ANDOR subtype constraints) are used
- selection of a subset of the IR, using subtype and select
pruning
- dimensionality of geometric representation items defined at each item
(not through the representation context)
- omission of the name attribute at the representation item
In addition to the adaptations from ISO/IS 10303-46:1994 the following
changes and additions have been made:
- surface styles, including the definition of lighting and rendering
properties and surface textures, are defined according to an adaptation of
definitions from
- ISO/IEC 14772-1: 1997: The Virtual Reality Modeling Language
(VRML) specification
- ISO/IEC FCD 19775:200x, the Extensible 3D (X3D)
specification
The semantic definitions of IfcPresentationAppearanceResource are
defined following the adaptation of the ISO/CD 10303-46:1992,
Industrial Automation Systems and Integration: Product Data Representation
and Exchange - Part 46: Integrated Generic Resources. Visual presentation.
The type, class, and function semantic definition sections follow the adapted
wording of the working draft, which is clearly indicated and quoted at each
reference.
The definitions of all parts of the
IfcPresentationAppearanceResource, that are taken from ISO10303-46,
ISO/IEC 14772-1, or ISO/IEC FCD 19775, are explicitly excluded from the
copyright of the International Alliance of Interoperability.
NOTE: For more information on
the definitions as defined in the formal ISO standard please refer to: ISO/IS
10303-46:1994, Industrial Automation Systems and Integration: Product Data
Representation and Exchange - Part 46: Integrated generic resources: Visual
presentation. The formal standard can be obtained through the local publishers
of standards in each individual country.
NOTE: For more information on
the definitions of the Virtual Reality Modeling Language (VRML) specification,
see http://www.web3d.org/ for more
information
NOTE: For more information on
the definitions of the Extensible 3D specification, see
http://www.web3d.org/ for more
information
The following is within the scope of the current versions of the
presentation resources:
- definition of presentation style attributes for realistic and
symbolic visualizations of geometric and non-geometric displayble elements in
the product information, including presentation styles for
- curve
- text
- filled area
- symbol
- surface
- support of externally defined character fonts and symbols;
- support of pre defined character fonts and symbols;
- image control by a layer mechanism.
Interfaced schemas (6):
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IfcLabel,
IfcPositiveLengthMeasure,
IfcLengthMeasure,
IfcRatioMeasure,
IfcPlaneAngleMeasure,
IfcPositiveRatioMeasure,
IfcNormalisedRatioMeasure,
IfcParameterValue,
IfcIdentifier,
IfcInteger,
IfcReal,
IfcDescriptiveMeasure,
IfcSIUnit);
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Entities (32):
Defined types (5):
Select types (13):
Enumerations (4):
