Z-Buffer...?....

void DX_Graphics::Initialize(HWND hWnd){	d3d = Direct3DCreate9(D3D_SDK_VERSION);						// Get pointer to Direct3D interface	// Test for hardware capabilities	DWORD mRequestedVP = D3DCREATE_HARDWARE_VERTEXPROCESSING;	D3DDISPLAYMODE mode;	d3d->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &mode);	if(FAILED(d3d->CheckDeviceType(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,mode.Format, mode.Format,true)))		MessageBox(hWnd, "Error","CheckDeviceType failed", MB_ICONEXCLAMATION | MB_OK);	if(FAILED(d3d->CheckDeviceType(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,D3DFMT_X8R8G8B8, D3DFMT_X8R8G8B8,false)))		MessageBox(hWnd, "Error","CheckDeviceType failed", MB_ICONEXCLAMATION | MB_OK);	// Device capabilities	D3DCAPS9 caps;	if(FAILED(d3d->GetDeviceCaps(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,∩︀)))		MessageBox(hWnd, "Error","Device caps failed", MB_ICONEXCLAMATION | MB_OK);		devBehaviorFlags = 0;	if(caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)		devBehaviorFlags |= mRequestedVP;	else		devBehaviorFlags |= D3DCREATE_SOFTWARE_VERTEXPROCESSING;	if(caps.DevCaps & D3DDEVCAPS_PUREDEVICE && devBehaviorFlags & D3DCREATE_HARDWARE_VERTEXPROCESSING)		devBehaviorFlags |= D3DCREATE_PUREDEVICE;	bool hardwareVP = false;	bool pure = false;	if(caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)		hardwareVP = true;	if(caps.DevCaps & D3DDEVCAPS_PUREDEVICE)		pure = true;	ZeroMemory(&d3dpp, sizeof(d3dpp));							// Set d3dpp struct values to NULL	d3dpp.EnableAutoDepthStencil = TRUE;    d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8;	d3dpp.BackBufferCount = 1;	d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;					// set the back buffer format to 32-bit    d3dpp.BackBufferWidth = WIDTH;								// set the width of the buffer    d3dpp.BackBufferHeight = HEIGHT;							// set the height of the buffer	d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;	// Usually equal to the refresh rate	d3dpp.hDeviceWindow = hWnd;	d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;				// Anti-alias level	d3dpp.MultiSampleQuality = 0;								// Quality of anti-alias	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;					// Describes how the SwapEffect deals whith old data in backbuffers.		if(isWindowed)												// Use this for windowed-mode		d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;	else														// Use for full-screen		d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;	d3dpp.Windowed = isWindowed;								// Set to windowed or fullscreen.  Only sets the device to fullscreen, not the actual Win32 window.	// This is a large function with many parameters but it will probably stay the same for most games which get written.	d3d->CreateDevice(		D3DADAPTER_DEFAULT,										// Find the graphics card		D3DDEVTYPE_HAL,											// Used to tell device to use software or hardware (HAL --> Hardware Abstraction Layer)		hWnd,													// Handle to the window		//D3DCREATE_MULTITHREADED |								// Multithread safe		devBehaviorFlags,										// Use software, hardware, or mixed to calculate vertex		&d3dpp,													// Pointer to the D3DPRESENT_PARAMETERS struct		&d3ddev);												// This is a pointer to a pointer to the graphics device interface.		//------------------------------------------------------------------------------------		InitLight();	d3ddev->SetRenderState(D3DRS_LIGHTING, FALSE);				// turn on the 3D lighting	d3ddev->SetRenderState(D3DRS_ZENABLE, TRUE);				// turn on the z-buffer	d3ddev->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_XRGB(50, 50, 50));    // ambient light	d3ddev->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);		// Turn on alphablending	d3ddev->SetRenderState(D3DRS_ALPHATESTENABLE, TRUE);		// Turn on testing for alpha	d3ddev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);		// Set the type of blending	SetProjection();	return;}