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HRESULT Optimize(
  DWORD Flags,
  CONST DWORD * pAdjacencyIn,
  DWORD * pAdjacencyOut,
  DWORD * pFaceRemap,
  LPD3DXBUFFER * ppVertexRemap,
  LPD3DXMESH * ppOptMesh
);
Parameters
Flags
[in] Specifies the type of optimization to perform. This parameter can be set to a combination of one or more flags from D3DXMESHOPT and D3DXMESH (except D3DXMESH_32BIT, D3DXMESH_IB_WRITEONLY, and D3DXMESH_WRITEONLY).
pAdjacencyIn
[in] Pointer to an array of three DWORDs per face that specifies the three neighbors for each face in the source mesh. If the edge has no adjacent faces, the value is 0xffffffff. See Remarks.
pAdjacencyOut
[in, out] Pointer to an array of three DWORDs per face that specifies the three neighbors for each face in the optimized mesh. If the edge has no adjacent faces, the value is 0xffffffff.
pFaceRemap
[in, out] An array of DWORDs, one per face, that identifies the original mesh face that corresponds to each face in the optimized mesh. If the value supplied for this argument is NULL, face remap data is not returned.
ppVertexRemap
[out] Address of a pointer to an ID3DXBuffer interface, which contains a DWORD for each vertex that specifies how the new vertices map to the old vertices. This remap is useful if you need to alter external data based on the new vertex mapping.
ppOptMesh
[out] Address of a pointer to an ID3DXMesh interface, representing the optimized mesh.

HRESULT D3DXSimplifyMesh(
  LPD3DXMESH pMesh,
  CONST DWORD * pAdjacency,
  CONST D3DXATTRIBUTEWEIGHTS * pVertexAttributeWeights,
  CONST FLOAT * pVertexWeights,
  DWORD MinValue,
  DWORD Options,
  LPD3DXMESH * ppMesh
);
Parameters
pMesh
[in] Pointer to an ID3DXMesh interface, representing the source mesh.
pAdjacency
[in] Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the mesh to be simplified.
pVertexAttributeWeights
[in] Pointer to a D3DXATTRIBUTEWEIGHTS structure, containing the weight for each vertex component. If this parameter is set to NULL, a default structure is used. See Remarks.
pVertexWeights
[in] Pointer to an array of vertex weights. If this parameter is set to NULL, all vertex weights are set to 1.0.
MinValue
[in] Number of vertices or faces, depending on the flag set in the Options parameter, by which to simplify the source mesh.
Options
[in] Specifies simplification options for the mesh. One of the flags in D3DXMESHSIMP can be set.
ppMesh
[out] Address of a pointer to an ID3DXMesh interface, representing the returned simplification mesh.