（新手向）渲染彩色三角形问题

lf723

[em21]渲染后，一片空白，没见到如期的2个彩色三角形，code如下
//顶点结构体
struct ColorVertex
{
        ColorVertex(){};
        ColorVertex(float x,float y,float z,D3DCOLOR cl)
        {
                _x = x;_y = y;_z = z;_color = cl;
        }
        float _x,_y,_z;
        D3DCOLOR _color;
        static const DWORD FVF;
};


const DWORD ColorVertex::FVF = D3DFVF_XYZ | D3DFVF_DIFFUSE;

IDirect3DDevice9* Device = NULL;

IDirect3DVertexBuffer9* VB = NULL;

D3DXMATRIX world;


BOOL Setup()
{
         Device->CreateVertexBuffer(3 * sizeof(ColorVertex),D3DUSAGE_WRITEONLY,ColorVertex::FVF,D3DPOOL_MANAGED,&VB,0);

        ColorVertex* v;
        VB->Lock(0,sizeof(ColorVertex),(void**)&v,0);

        v[0] = ColorVertex(-1.0f,0.0f,2.0f,RED);
        v[1] = ColorVertex(0.0f,1.0f,2.0f,GREEN);
        v[2] = ColorVertex(1.0f,0.0f,2.0f,BLUE);

        VB->Unlock();

        //视图矩阵
        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 Vi;

        D3DXMatrixLookAtLH(&Vi,&position,&target,&up);

        Device->SetTransform(D3DTS_VIEW,&Vi);

        //投影矩阵
        D3DXMATRIX proj;

        D3DXMatrixPerspectiveFovLH(&proj,D3DX_PI * 0.5f,600/800,1.0f,1000.0f);

        Device->SetTransform(D3DTS_PROJECTION,&proj);

        //屏蔽灯光
        Device->SetRenderState(D3DRS_LIGHTING,FALSE);

          return TRUE;
}

BOOL Display(float timeDetal)
{

        if (Device)
        {
               
                Device->Clear(0,0,D3DCLEAR_TARGET,0xffffffff,1.0f,0);
               
                //开始渲染
                Device->BeginScene();

                Device->SetFVF(ColorVertex::FVF);

                Device->SetStreamSource(0,VB,0,sizeof(ColorVertex));


                D3DXMatrixTranslation(&world,-1.25f,0.0f,0.0f);

                Device->SetTransform(D3DTS_WORLD,&world);

                Device->SetRenderState(D3DRS_SHADEMODE,D3DSHADE_FLAT);

                Device->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);

                D3DXMatrixTranslation(&world,1.25f,0.0f,0.0f);

                Device->SetTransform(D3DTS_WORLD,&world);

                Device->SetRenderState(D3DRS_SHADEMODE,D3DSHADE_GOURAUD);

                Device->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);

                //结束渲染
                Device->EndScene();

                Device-&gtresent(0,0,0,0);

        }

        return TRUE;
}

查看别人的类似也一样的渲染，为什么这里渲染不出来，环境：P8400，9600GM，WIN7 64,在线等

ljm

看看每个调用的返回值有没有失败的