i was working perfectly with direct3d under c# with no problem,and very quick, until i came accross switching to unmanaged c++. so i started from scratch creating device and so forth. the problem is, the device is created but it draws nothing, nomatter wat i do to it. here r some sample code i did: // Creating the device if( NULL == ( m_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) ) return; // Set up the structure used to create the D3DDevice ZeroMemory( &m_d3dpp, sizeof(m_d3dpp) ); m_d3dpp.Windowed = TRUE; m_d3dpp.BackBufferWidth = m_iWidth; m_d3dpp.BackBufferHeight = m_iHeight; m_d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8; m_d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; m_d3dpp.AutoDepthStencilFormat = D3DFMT_D16; m_d3dpp.EnableAutoDepthStencil = true; // Create the D3DDevice if( FAILED( m_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, m_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &m_d3dpp, &m_pd3dDevice ) ) ) { return; } //Begin Frame DWORD state; m_pd3dDevice->GetRenderState(D3DRS_ZENABLE, &state); if( state ) { m_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_COLORVALUE(0.0f,0.0f,1.0f,1.0f), m_fZDepth, m_dwStencil ); } else { m_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_COLORVALUE(0.0f,0.0f,1.0f,1.0f), m_fZDepth, m_dwStencil ); } m_pd3dDevice->BeginScene(); // EndFrame m_pd3dDevice->EndScene(); m_pd3dDevice->Present( NULL, NULL, NULL, NULL ); // Creating vertex struct struct VertexSimple { float x, y, z; DWORD diffuse; }; #define FVF_SIMPLE (D3DFVF_XYZ | D3DFVF_DIFFUSE) // Initializing geometry g_Device->CreateDevice(); g_Device->m_pd3dDevice->SetRenderState(D3DRS_LIGHTING, false); VertexSimple *vert = new VertexSimple[3]; vert[0].x = 50; vert[0].y = 50; vert[0].z = 0; vert[0].diffuse = D3DCOLOR_XRGB(10, 0, 0); vert[1].x = 150; vert[1].y = 00; vert[1].z = 0; vert[1].diffuse = D3DCOLOR_XRGB(10, 0, 0); vert[2].x = 0; vert[2].y = 0; vert[2].z = 0; vert[2].diffuse = D3DCOLOR_XRGB(10, 0, 0); g_Device->m_pd3dDevice->CreateVertexBuffer( 3*sizeof(VertexSimple), D3DUSAGE_WRITEONLY, FVF_SIMPLE, D3DPOOL_DEFAULT, &VertexBuffer, NULL ); void *pVertices = NULL; VertexBuffer->Lock( 0, sizeof( 3*sizeof(VertexSimple) ), (void**)&pVertices, 0 ); memcpy( pVertices, vert, sizeof(3*sizeof(VertexSimple) ) ); VertexBuffer->Unlock(); // My camera is initialized as follows: m_pd3dDevice = dev.m_pd3dDevice; D3DXMATRIXA16 Projection; D3DXMatrixPerspectiveFovLH(&Projection, 45.0f, 4/3, 1, 10000); m_pd3dDevice->SetTransform(D3DTS_PROJECTION, &Projection); // Look function called while rendering D3DXMATRIXA16 mView; D3DXMatrixLookAtLH(&mView, &Pos, &(View + Pos), &Up); m_pd3dDevice->SetTransform(D3DTS_VIEW, &mView); // in main, i initalize the position view and up o fthe camera as follows: pos.x = 50; pos.y = 0; pos.z = -10; view.x = 0; view.y = 0; view.z = 1; up.x = 0; up.y = 1; up.z = 0; //In my render loop i draw the three verts as follows: D3DXMATRIX world; D3DXMatrixIdentity(&world); g_Device->m_pd3dDevice->SetTransform(D3DTS_WORLD, &world); g_Device->m_pd3dDevice->SetFVF( FVF_SIMPLE ); g_Device->m_pd3dDevice->SetStreamSource( 0, VertexBuffer, 0, sizeof(VertexSimple) ); g_Device->m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 ); where is my problem? i setup the camera correct, and looks in right direction, and setup the vertices correctly. why does this same piece of code works under Managed direct3D (c#) and not under unmaned c++ Direct3D? very weird, anybody has a clue?

Just for future reference, you can make your posts look a lot more appealing by using the [ source ] - [ / source ] tags around your code fragment(s) [smile]

Anyway...

As a general rule of thumb, native/unmanaged code tends to be a little less forgiving/helpful than the managed equivalent.

You haven't got any particular information on whether anything is failing - you're not checking any return codes that I can see.

I suggest you follow the steps found here about how to debug a Direct3D application. If it's a "proper" error, the aforementioned articles methods will tell you exactly what it is [smile]

hth
Jack