I am tring to create a light effect on a 3D triangle.(The code below is what I have written) but the result when running this program is that I have only a black screen with nothing on it! Can anyone please to help to check my code! Thanks very much!(by the way, I basicly copy out the code from Microsoft Tutorial) //I initialize my d3d here: // Create the D3D object. if( NULL == ( m_pD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) ) return E_FAIL; // Get the current desktop display mode, so we can set up a back // buffer of the same format D3DDISPLAYMODE d3ddm; if( FAILED( m_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) ) return E_FAIL; // Set up the structure used to create the D3DDevice D3DPRESENT_PARAMETERS d3dpp; ZeroMemory( &d3dpp, sizeof(d3dpp) ); d3dpp.Windowed = TRUE; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = d3ddm.Format; d3dpp.EnableAutoDepthStencil = TRUE; d3dpp.AutoDepthStencilFormat = D3DFMT_D16; // Create the D3DDevice if( FAILED( m_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, m_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &m_pd3dDevice ) ) ) { return E_FAIL; } // Turn off culling m_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE ); // Turn on the zbuffer m_pd3dDevice->SetRenderState( D3DRS_ZENABLE, TRUE ); /////////////////////////////////////////////////////////// //I create my vertex buffer here: // Create the vertex buffer. if( FAILED( m_pd3dDevice->CreateVertexBuffer( 3*2*sizeof(CUSTOMVERTEX), 0, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &m_pVB ) ) ) { return E_FAIL; } // Fill the vertex buffer. We are algorithmically generating a cylinder // here, including the normals, which are used for lighting. CUSTOMVERTEX* pVertices; if( FAILED( m_pVB->Lock( 0, 0, (BYTE**)&pVertices, 0 ) ) ) return E_FAIL; pVertices[0].position = D3DXVECTOR3( -1.0f,-1.0f, -2.0f ); pVertices[0].normal = D3DXVECTOR3( 1.0f, -2.0f, 2.0f ); pVertices[1].position = D3DXVECTOR3( -1.0f,-1.0f, -2.0f ); pVertices[1].normal = D3DXVECTOR3( 0.0f, 2.0f, 0.0f ); pVertices[2].position = D3DXVECTOR3( -1.0f,-1.0f, -2.0f ); pVertices[2].normal = D3DXVECTOR3( 0.0f,0.0f,0.0f ); m_pVB->Unlock(); return S_OK; //////////////////////////////////////////////////////////////// //I setup my light here: // Set up a material. The material here just has the diffuse and ambient // colors set to yellow. Note that only one material can be used at a time. D3DMATERIAL8 mtrl; ZeroMemory( &mtrl, sizeof(D3DMATERIAL8) ); mtrl.Diffuse.r = mtrl.Ambient.r = 1.0f; mtrl.Diffuse.g = mtrl.Ambient.g = 1.0f; mtrl.Diffuse.b = mtrl.Ambient.b = 1.0f; mtrl.Diffuse.a = mtrl.Ambient.a = 1.0f; m_pd3dDevice->SetMaterial( &mtrl ); // Set up a white, directional light, with an oscillating direction. // Note that many lights may be active at a time (but each one slows down // the rendering of our scene). However, here we are just using one. Also, // we need to set the D3DRS_LIGHTING renderstate to enable lighting 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; vecDir = D3DXVECTOR3(cosf(/*/timeGetTime()*/44/350.0f), 1.0f, sinf(timeGetTime()/350.0f) ); D3DXVec3Normalize( (D3DXVECTOR3*)&light.Direction, &vecDir ); light.Range = 1000.0f; m_pd3dDevice->SetLight( 0, &light ); m_pd3dDevice->LightEnable( 0, TRUE ); m_pd3dDevice->SetRenderState( D3DRS_LIGHTING, TRUE ); // Finally, turn on some ambient light. m_pd3dDevice->SetRenderState( D3DRS_AMBIENT, 0x00202020 ); ////////////////////////////////////////////////////////////// //I render my scene here: // Clear the backbuffer to a black color m_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 ); // Begin the scene m_pd3dDevice->BeginScene(); // Setup the world, view, and projection matrices SetupMatrix(); SetLight(); // Render the vertex buffer contents m_pd3dDevice->SetStreamSource( 0, m_pVB, sizeof(CUSTOMVERTEX) ); m_pd3dDevice->SetVertexShader( D3DFVF_CUSTOMVERTEX ); m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 ); // End the scene m_pd3dDevice->EndScene(); // Present the backbuffer contents to the display m_pd3dDevice->Present( NULL, NULL, NULL, NULL ); ///////////////////////////////////////////////////////////// Sorry about such a long code,but I really need your code to fix it because I am an absolute newbie to D3D. Thanks for your great help once again!!!!!!

REALLY NO ONE WILLING TO HELP OUT?????????????????????

why do the 3 vertices have the same position?
why do you create a 6-vertex VB and draw a 3-vertex triangle?
are your sure your light is pointing through the tri but not somewhere in Mars?