IfcBlobTexture

Natural language names
deTextur - als Binärformat eingefügt
enBlob Texture
frBlob de texture
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcBlobTexture
      ModeXXMODIFIEDName changed from TextureType to Mode.
Type changed from IfcSurfaceTextureEnum to IfcIdentifier.
Instantiation changed to OPTIONAL.
      ParameterXMODIFIEDName changed from RasterFormat to Parameter.
Instantiation changed to OPTIONAL.
Aggregation changed from NONE to LIST.
      RasterFormatXXMODIFIEDName changed from RasterCode to RasterFormat.
Type changed from BOOLEAN to IfcIdentifier.
      RasterCodeADDED
IFC4 Addendum 1
    IfcBlobTexture
      RepeatSMODIFIEDType changed from BOOLEAN to IfcBoolean.
      RepeatTMODIFIEDType changed from BOOLEAN to IfcBoolean.
      RasterCodeMODIFIEDType changed from BINARY to IfcBinary.
Semantic definitions at the entity
Entity definition

An IfcBlobTexture provides a 2-dimensional distribution of the lighting parameters of a surface onto which it is mapped. The texture itself is given as a single binary blob, representing the content of a pixel format file. The file format of the pixel file is given by the RasterFormat attribute and allowable formats are guided by where rule SupportedRasterFormat.

NOTE  Toolbox specific implementations of the binary datatype may restrict the maximum length of the binary blob to capture the raster file content.

For interpretation of the texture nodes see IfcImageTexture definition.

HISTORY  New entity in IFC2x3.
IFC4 CHANGE  Data type of RasterCode has been corrected to BINARY.
Attribute definitions
#AttributeTypeCardinalityDescription C
6RasterFormatIfcIdentifier[1:1] The format of the RasterCode often using a compression.X
7RasterCodeIfcBinary[1:1] Blob, given as a single binary, to capture the texture within one popular file (compression) format. The file format is provided by the RasterFormat attribute.X
Formal Propositions
RuleDescription
SupportedRasterFormatCurrently the formats of bmp, jpg, gif and pgn, shall be supported.
RasterCodeByteStreamThe size of the raster code shall be a multiple of 8 bits.
Inherited definitions from supertypes
Entity inheritance IfcSurfaceTexture IfcPresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionC
IfcPresentationItem
IfcSurfaceTexture
1RepeatSIfcBoolean[1:1] The RepeatS field specifies how the texture wraps in the S direction. If RepeatS is TRUE (the default), the texture map is repeated outside the [0.0, 1.0] texture coordinate range in the S direction so that it fills the shape. If RepeatS is FALSE, the texture coordinates are clamped in the S direction to lie within the [0.0, 1.0] range.
X
2RepeatTIfcBoolean[1:1] The RepeatT field specifies how the texture wraps in the T direction. If RepeatT is TRUE (the default), the texture map is repeated outside the [0.0, 1.0] texture coordinate range in the T direction so that it fills the shape. If RepeatT is FALSE, the texture coordinates are clamped in the T direction to lie within the [0.0, 1.0] range.
X
3ModeIfcIdentifier[0:1] The Mode attribute is provided to control the appearance of a multi textures. The mode then controls the type of blending operation. The mode includes a MODULATE for a lit appearance, a REPLACE for a unlit appearance, and variations of the two.
NOTE  The applicable values for the Mode attribute are determined by view definitions or implementer agreements. It is recommended to use the modes described in ISO/IES 19775-1.2:2008 X3D Architecture and base components Edition 2, Part 1. See 18.4.3 MultiTexture for recommended values.
X
4TextureTransformIfcCartesianTransformationOperator2D[0:1] The TextureTransform defines a 2D transformation that is applied to the texture coordinates. It affects the way texture coordinates are applied to the surfaces of geometric representation itesm. The 2D transformation supports changes to the size, orientation, and position of textures on shapes. Mirroring is not allowed to be used in the IfcCartesianTransformationOperatorX
5ParameterIfcIdentifierL[1:?] The Parameter attribute is provided to control the appearance of a multi textures. The applicable parameters depend on the value of the Mode attribute.
NOTE  The applicable values for the list of Parameter attributes are determined by view definitions or implementer agreements. It is recommended to use the source and the function fields described in ISO/IES 19775-1.2:2008 X3D Architecture and base components Edition 2, Part 1. See 18.4.3 MultiTexture for recommended values.
By convention, Parameter[1] shall then hold the source value, Parameter[2] the function value, Parameter[3] the base RGB color for select operations, and Parameter[4] the alpha value for select operations.
X
IsMappedByIfcTextureCoordinate
@Maps
S[0:?]Texture coordinates, either provided by a corresponding list of texture vertices to vertex-based geometric items or by a texture coordinate generator, that applies the surface texture to the surfaces of the geometric items. IFC4 CHANGE  New attribute added at the end of the attribute list.X
UsedInStylesIfcSurfaceStyleWithTextures
@Textures
S[0:?]X
IfcBlobTexture
6RasterFormatIfcIdentifier[1:1] The format of the RasterCode often using a compression.X
7RasterCodeIfcBinary[1:1] Blob, given as a single binary, to capture the texture within one popular file (compression) format. The file format is provided by the RasterFormat attribute.X
Formal representations
XSD Specification
 <xs:element name="IfcBlobTexture" type="ifc:IfcBlobTexture" substitutionGroup="ifc:IfcSurfaceTexture" nillable="true"/>
 <xs:complexType name="IfcBlobTexture">
  <xs:complexContent>
   <xs:extension base="ifc:IfcSurfaceTexture">
    <xs:attribute name="RasterFormat" type="ifc:IfcIdentifier" use="optional"/>
    <xs:attribute name="RasterCode" type="xs:hexBinary" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcBlobTexture
 SUBTYPE OF (IfcSurfaceTexture);
  RasterFormat : IfcIdentifier;
  RasterCode : IfcBinary;
 WHERE
  SupportedRasterFormat : SELF.RasterFormat IN ['BMP', 'JPG', 'GIF', 'PNG'];
  RasterCodeByteStream : BLENGTH(RasterCode) MOD 8 = 0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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