8.12.3.45 IfcTextureVertex
8.12.3.45.1 Semantic definition
An IfcTextureVertex is a list of 2 (S, T) texture coordinates.
Each vertex-based geometry node uses a set of 2D texture coordinates that map textures to vertices. Texture map values ( ImageTexture, PixelTexture) range from [0.0, 1.0] along the S-axis and T-axis. However, texture coordinate values may be in the range (-∞,∞). Texture coordinates identify a location (and thus a colour value) in the texture map. The horizontal coordinate S is specified first, followed by the vertical coordinate T. If the texture map is repeated in a given direction (S-axis or T-axis), a texture coordinate C (s or t) is mapped into a texture map that has N pixels in the given direction as follows:
Texture map location = (C - floor(C)) × NIf the texture map is not repeated, the texture coordinates are clamped to the 0.0 to 1.0 range as follows:
Texture map location = N, if C > 1.0,
= 0.0, if C < 0.0,
= C × N, if 0.0 ≤ C ≤ 1.0.
8.12.3.45.2 Entity inheritance
-
- IfcTextureVertex
- IfcColourRgbList
- IfcColourSpecification
- IfcCurveStyleFont
- IfcCurveStyleFontAndScaling
- IfcCurveStyleFontPattern
- IfcIndexedColourMap
- IfcPreDefinedItem
- IfcSurfaceStyleLighting
- IfcSurfaceStyleRefraction
- IfcSurfaceStyleShading
- IfcSurfaceStyleWithTextures
- IfcSurfaceTexture
- IfcTextStyleForDefinedFont
- IfcTextStyleTextModel
- IfcTextureCoordinate
- IfcTextureVertexList
8.12.3.45.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcTextureVertex (1) | |||
| 1 | Coordinates | LIST [2:2] OF IfcParameterValue |
The first Coordinate[1] is the S, the second Coordinate[2] is the T parameter value. |
8.12.3.45.4 Formal representation
ENTITY IfcTextureVertex
SUBTYPE OF (IfcPresentationItem);
Coordinates : LIST [2:2] OF IfcParameterValue;
END_ENTITY;