//This is how my custom vertex is declared

struct CUSTOMVERTEX
{
    D3DXVECTOR3 position; // The position.

	D3DXVECTOR3 normal;
    FLOAT       tu, tv;   // The texture coordinates.

};

#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_NORMAL|D3DFVF_TEX1)

LPDIRECT3DVERTEXBUFFER8 g_pVB; // Buffer to hold vertices

LPDIRECT3DTEXTURE8      g_pGroundTexture; // Our ground texture

D3DMATERIAL8 Material;
//Then i load the texture:

D3DXCreateTextureFromFile( device, "ground.bmp", &g_pGroundTexture));
// and create the vertex buffer

device->CreateVertexBuffer( 5*sizeof(CUSTOMVERTEX),0,D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT, &g_pVB))
//and set up the material

ZeroMemory(&Material,sizeof(Material));
Material.Diffuse.r = 1.0f;
Material.Diffuse.g = 1.0f;
Material.Diffuse.b = 1.0f;

CUSTOMVERTEX* pVertices;
// lock the vertex buffer

g_pVB->Lock( 0, 0, (BYTE**)&pVertices, 0 )

// and initialize the vertices

// i want to show a plane in the x/z axis, the normals point up

pVertices[0].position=D3DXVECTOR3(0.0f,0.0f,1.0f);
pVertices[0].normal=D3DXVECTOR3(0.0f,1.0f,0.0f);
pVertices[0].tu=0.0f;
pVertices[0].tv=0.0f;
pVertices[1].position=D3DXVECTOR3(0.0f,0.0f,0.0f);
pVertices[1].normal=D3DXVECTOR3(0.0f,1.0f,0.0f);
pVertices[1].tu=0.0f;
pVertices[1].tv=1.0f;
pVertices[2].position=D3DXVECTOR3(1.0f,0.0f,1.0f);
pVertices[2].normal=D3DXVECTOR3(0.0f,1.0f,0.0f);
pVertices[2].tu=1.0f;
pVertices[2].tv=0.0f;
pVertices[3].position=D3DXVECTOR3(1.0f,0.0f,0.0f);
pVertices[3].normal=D3DXVECTOR3(0.0f,1.0f,0.0f);
pVertices[3].tu=1.0f;
pVertices[3].tv=1.0f;
g_pVB->Unlock();


// then render it

device->SetTexture( 0, g_pGroundTexture);
device->SetTextureStageState( 0, D3DTSS_COLOROP,   D3DTOP_MODULATE );
device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
device->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
device->SetTextureStageState( 0, D3DTSS_ALPHAOP,   D3DTOP_DISABLE );

device->SetMaterial(&Material);
device->SetVertexShader( D3DFVF_CUSTOMVERTEX );
device->SetStreamSource( 0, g_pVB, sizeof(CUSTOMVERTEX) );
device->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0,4);

      

  	//*** Set up some lights to make the scene look cool	D3DXVECTOR3 vecDir;	D3DLIGHT8 light;	ZeroMemory( &light, sizeof(D3DLIGHT8) );	light.Type       = D3DLIGHT_DIRECTIONAL;	light.Diffuse.r  = 1.0f;	light.Diffuse.g  = 1.0f;	light.Diffuse.b  = 1.0f;	light.Ambient.r  = 0.0f;	light.Ambient.g  = 0.0f;	light.Ambient.b  = 0.0f;	light.Specular.r = 0.0f;	light.Specular.g = 0.0f;	light.Specular.b = 0.0f;	vecDir = D3DXVECTOR3(0.0f,-1.0f,0.0f);		D3DXVec3Normalize( (D3DXVECTOR3*)&light.Direction, &vecDir );		light.Range       = 1000.0f;	device->SetLight( 0, &light );	device->LightEnable( 0, TRUE );	device->SetRenderState( D3DRS_LIGHTING, TRUE );	//*** Finally, turn on some ambient light.	device->SetRenderState( D3DRS_AMBIENT, 0x00202020 );