Step 1: Defining a Custom Vertex Format

Before using textures, a custom vertex format that includes texture coordinates must be used. Texture coordinates tells Microsoft® Direct3D® where to place a texture for each vector in a primitive. Texture coordinates range from 0.0 to 1.0, where (0.0, 0.0) represents the top left-hand side of the texture and (1.0, 1.0) represents the bottom right-hand side of the texture.

The following code fragment shows how the Texture sample project sets up it's custom vertex format to include texture coordinates.

' Custom vertex type.
Private Type CUSTOMVERTEX
    postion As D3DVECTOR    '3-D position for vertex.
    color As Long           'Color of the vertex.
    tu As Single            'Texture map coordinate.
    tv As Single            'Texture map coordinate.
End Type

' Custom FVF.
Const D3DFVF_CUSTOMVERTEX = (D3DFVF_XYZ Or D3DFVF_DIFFUSE Or D3DFVF_TEX1)

For more information on texture coordinates, see Texture Coordinates.

Now that a custom vertex type has been defined, the next step is to load a texture and create a cylinder, as described in Step 2: Initializing Screen Geometry.