8.12.3.1 IfcBlobTexture
8.12.3.1.1 Semantic 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.
For interpretation of the texture nodes see IfcImageTexture definition.
8.12.3.1.2 Entity inheritance
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- IfcSurfaceTexture
- IfcColourRgbList
- IfcColourSpecification
- IfcCurveStyleFont
- IfcCurveStyleFontAndScaling
- IfcCurveStyleFontPattern
- IfcIndexedColourMap
- IfcPreDefinedItem
- IfcSurfaceStyleLighting
- IfcSurfaceStyleRefraction
- IfcSurfaceStyleShading
- IfcSurfaceStyleWithTextures
- IfcTextStyleForDefinedFont
- IfcTextStyleTextModel
- IfcTextureCoordinate
- IfcTextureVertex
- IfcTextureVertexList
8.12.3.1.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcSurfaceTexture (7) | |||
| 1 | RepeatS | IfcBoolean |
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. |
| 2 | RepeatT | IfcBoolean |
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. |
| 3 | Mode | OPTIONAL IfcIdentifier |
Mode shall hold the type of map this corresponds to, chosen from the following list: AMBIENT, NORMAL, EMISSIVE, METALLICROUGHNESS, OCCLUSION, SHININESS, SPECULAR, DIFFUSE. If Mode is omitted, DIFFUSE is assumed. |
| 4 | TextureTransform | OPTIONAL IfcCartesianTransformationOperator2D |
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 items. The 2D transformation supports changes to the size, orientation, and position of textures on shapes. Mirroring is not allowed to be used in the IfcCartesianTransformationOperator |
| 5 | Parameter | OPTIONAL LIST [1:?] OF IfcIdentifier | |
| IsMappedBy | SET [0:?] OF IfcTextureCoordinate FOR Maps |
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. |
|
| UsedInStyles | SET [0:?] OF IfcSurfaceStyleWithTextures FOR Textures |
No description available. |
|
| Click to show 7 hidden inherited attributes Click to hide 7 inherited attributes | |||
| IfcBlobTexture (2) | |||
| 6 | RasterFormat | IfcIdentifier |
The format of the RasterCode often using a compression. |
| 7 | RasterCode | IfcBinary |
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. |
8.12.3.1.4 Formal propositions
| Name | Description |
|---|---|
| RasterCodeByteStream |
The size of the raster code shall be a multiple of 8 bits. |
|
|
| SupportedRasterFormat |
Currently the formats of bmp, jpg, gif and pgn, shall be supported. |
|
|
8.12.3.1.5 Examples
8.12.3.1.6 Formal representation
ENTITY IfcBlobTexture
SUBTYPE OF (IfcSurfaceTexture);
RasterFormat : IfcIdentifier;
RasterCode : IfcBinary;
WHERE
RasterCodeByteStream : BLENGTH(RasterCode) MOD 8 = 0;
SupportedRasterFormat : SELF.RasterFormat IN ['BMP', 'JPG', 'GIF', 'PNG'];
END_ENTITY;