IfcTextureVertex

Definition from IAI: An IfcTextureVertex is a list of 2 (S, T) texture coordinates.

The following additional definitions from ISO/IEC FCD 19775:200x, the Extensible 3D (X3D) specification, apply:

> 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)) × N

> If 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.

> Texture coordinates may be transformed (scaled, rotated, translated) by supplying a TextureTransform as a component of the texture's definition.

> HISTORY: New entity in IFC Release 2x Edition 2.

EXPRESS specification:

ENTITY IfcTextureVertex;
Coordinates | : | LIST [2:2] OF IfcParameterValue;
END_ENTITY;

Attribute definitions:

Coordinates | : | The first coordinate[1] is the S, the second coordinate[2] is the T parameter value.

Inheritance graph

ENTITY IfcTextureVertex;
ENTITY IfcTextureVertex;
Coordinates | : | LIST [2:2] OF IfcParameterValue;
END_ENTITY;