D3DXSplitMesh function

Splits a mesh into meshes smaller than the specified size.

Syntax

void D3DXSplitMesh(
  _In_        LPD3DXMESH   pMeshIn,
  _In_  const DWORD        *pAdjacencyIn,
  _In_  const DWORD        MaxSize,
  _In_  const DWORD        Options,
  _Out_       DWORD        *pMeshesOut,
  _Out_       LPD3DXBUFFER *ppMeshArrayOut,
  _Out_       LPD3DXBUFFER *ppAdjacencyArrayOut,
  _Out_       LPD3DXBUFFER *ppFaceRemapArrayOut,
  _Out_       LPD3DXBUFFER *ppVertRemapArrayOut
);

Parameters

pMeshIn [in]

Type: LPD3DXMESH

Pointer to an ID3DXMesh interface, representing the source mesh.

pAdjacencyIn [in]

Type: const DWORD*

Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the mesh to be simplified.

MaxSize [in]

Type: const DWORD

Maximum number of vertices in the resulting mesh.

Options [in]

Type: const DWORD

Option flags for the new meshes.

pMeshesOut [out]

Type: DWORD*

Number of meshes returned.

ppMeshArrayOut [out]

Type: LPD3DXBUFFER*

Buffer containing an array of ID3DXMesh interfaces for the new meshes. For a source mesh split into n meshes, ppMeshArrayOut is an array of n ID3DXMesh pointers.

ppAdjacencyArrayOut [out]

Type: LPD3DXBUFFER*

Buffer containing an array of adjacency arrays (DWORDs) for the new meshes. See ID3DXBuffer. This parameter is optional.

ppFaceRemapArrayOut [out]

Type: LPD3DXBUFFER*

Buffer containing an array of face remap arrays (DWORDs) for the new meshes. See ID3DXBuffer. This parameter is optional.

ppVertRemapArrayOut [out]

Type: LPD3DXBUFFER*

Buffer containing an array of vertex remap arrays for the new meshes. See ID3DXBuffer. This parameter is optional.

Return value

If the function succeeds, the return value is D3D_OK. If the function fails, the return value can be one of the following values: D3DERR_INVALIDCALL, D3DXERR_INVALIDDATA, E_OUTOFMEMORY.

Remarks

A common use of this function is to split a mesh with 32-bit indices (more than 65535 vertices) into more than one mesh, each of which has 16-bit indices.

The adjacency, vertex remap and face remap arrays are arrays are DWORDs where each array contains n DWORD pointers, followed by the DWORD data referenced by the pointers. For example, to obtain the face remap information for face 3 in mesh 2, the following code could be used, assuming the face remap data was returned in a variable named ppFaceRemapArrayOut.

   
const DWORD **face_remaps = 
    static_cast<DWORD **>(ppFaceRemapArrayOut->GetBufferPointer());
const DWORD remap = face_remaps[2][3];

Requirements

See also

Mesh Functions