请问为什么设置灯光和材质后物体是全白的

Greentea107

LPDIRECT3DDEVICE9 pDevice = NULL;
ID3DXMesh * teapot;
D3DMATERIAL9 mat;

void InitTeapot()
{
        D3DXCreateTeapot(pDevice, &teapot, 0);
        D3DXCOLOR red( D3DCOLOR_XRGB(255,0,0));
        D3DXCOLOR black(D3DCOLOR_XRGB(0,0,0));
        mat = InitMaterial(red,red,red,black,1.0f);
        pDevice->SetMaterial(&mat);
        D3DXVECTOR3 dir(1.0f, -0.0f, 0.25f);
        D3DXCOLOR   c(D3DCOLOR_XRGB(255,255,255));
        D3DLIGHT9 dirLight = InitDirectionalLight(&dir, &c);

        pDevice->SetLight(0, &dirLight);
        pDevice->LightEnable(0, true);

        SetupPerspective();
        SetupCamera();
        pDevice->SetRenderState(D3DRS_LIGHTING,false);
        pDevice->SetRenderState(D3DRS_NORMALIZENORMALS, true);
        pDevice->SetRenderState(D3DRS_SPECULARENABLE, false);
}

void SetupCamera()
{
        D3DXVECTOR3 position (0.0f, 0.0f, -5.0f);
        D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
        D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
        D3DXMATRIX V;
        D3DXMatrixLookAtLH(&V,&position,&target,&up);
        pDevice->SetTransform(D3DTS_VIEW,&V);
}

void SetupPerspective()
{
        D3DXMATRIX pro;
        D3DXMatrixPerspectiveFovLH(&pro,D3DX_PI * 0.5f,nWindowWidth/nWindowHeight,1.0f,1000.0f);
        pDevice->SetTransform(D3DTS_PROJECTION,&pro);
}

D3DMATERIAL9 InitMaterial(D3DXCOLOR a,D3DXCOLOR d,D3DXCOLOR s,D3DXCOLOR e,float p)
{
        D3DMATERIAL9 mat;
        mat.Ambient = a;
        mat.Diffuse = d;
        mat.Specular = s;
        mat.Emissive = e;
        mat.Power = p;
        return mat;
}

bool Render(double time)
{
        if (pDevice == NULL) return false;
        pDevice->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,155,255), 1.0f, 0);
        pDevice->BeginScene();
       
        D3DXMATRIX tploc;
        static double y = 0;
        y += time;
        D3DXMatrixRotationY(&tploc,y);
        pDevice->SetTransform(D3DTS_WORLD,&tploc);
        teapot->DrawSubset(0);
       
        pDevice->EndScene();
        pDevice-&gtresent(0, 0, 0, 0);
        return true;
}
程序能够运行，但物体就是白色的，这是为什么啊？我好像没有地方出错啊

x06j21

pDevice->SetRenderState(D3DRS_LIGHTING,false);