The IDirect3DViewport3::SetBackgroundDepth2 method sets the background-depth field for the viewport.
HRESULT SetBackgroundDepth2(
  LPDIRECTDRAWSURFACE4 lpDDS  
);
 If the method succeeds, the return value is D3D_OK.
If the method fails, the return value may be one of the following values:
| DDERR_INVALIDOBJECT | 
| DDERR_INVALIDPARAMS | 
The depth-buffer is filled with the specified depth field when the IDirect3DViewport3::Clear or IDirect3DViewport3::Clear2 methods are called with the D3DCLEAR_ZBUFFER flag is specified.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in d3d.h.
  Import Library: Use ddraw.lib.