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Welds together replicated vertices that have equal attributes. This method uses specified epsilon values for equality comparisons.
Syntax
HRESULT WINAPI D3DXWeldVertices(
LPD3DXMESH pMesh, DWORD Flags, const D3DXWELDEPSILONS *pEpsilons, const DWORD *pAdjacencyIn, DWORD *pAdjacencyOut, DWORD *pFaceRemap, LPD3DXBUFFER *ppVertexRemap );
Parameters
- pMesh
- [in] Pointer to an ID3DXMesh object, the mesh from which to weld vertices.
- Flags
- [in] Combination of one or more flags from D3DXWELDEPSILONSFLAGS.
- pEpsilons
- [in] Pointer to a D3DXWELDEPSILONS structure, specifying the epsilon values to be used for this method. If NULL, a default value of 1.0e-6f is used for all members of D3DXWELDEPSILONS.
- pAdjacencyIn
- [in] Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the source mesh. If the edge has no adjacent faces, the value is 0xffffffff. If this parameter is set to NULL, ID3DXBaseMesh::GenerateAdjacency will be called to create logical adjacency information.
- pAdjacencyOut
- [in, out] Pointer to a destination buffer for the face adjacency array of the optimized mesh. The face adjacency is stored as an array of arrays. The innermost array is three indices of adjacent triangles, and the outer array is one set of face adjacency per triangle in the mesh.
- pFaceRemap
- [out] Pointer to a destination array containing the new index for each face. The array has the same number of elements as the original number of faces. Each element of the array contains either the index of the original face, or 0xffffffff if the original face has been removed in the vertex welding.
- ppVertexRemap
- [out] Address of a pointer to an ID3DXBuffer interface, containing the new index for each vertex.
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 The method call is invalid. For example, a method's parameter may have an invalid value. E_OUTOFMEMORY Microsoft Direct3D could not allocate sufficient memory to complete the call.
Remarks
This function uses supplied adjacency information to determine the points that are replicated. Vertices are merged based upon an epsilon comparison. Vertices with equal position must already have been calculated and represented by point-representative data.
This function combines logically-welded vertices that have similar components, such as normals within pEpsilons or texture coordinates within pEpsilons.
The following example code calls this function with welding enabled. Vertices are compared using epsilon values for normal vector and vertex position. A pointer is returned to a face remapping array, pFaceRemap.
TCHAR strMediaPath[512]; // X-file path LPD3DXBUFFER pAdjacencyBuffer = NULL; // adjacency data buffer LPD3DXBUFFER pD3DXMtrlBuffer = NULL; // material buffer LPD3DXMESH pMesh = NULL; // mesh object DWORD m_dwNumMaterials; // number of materials D3DXWELDEPSILONS Epsilons; // structure with epsilon values DWORD *pFaceRemap[65536]; // face remapping array DWORD i; // internal variable // Load the mesh from the specified file hr = D3DXLoadMeshFromX ( strMediaPath, D3DXMESH_MANAGED, m_pd3dDevice, &pAdjacencyBuffer, &pD3DXMtrlBuffer, NULL, &m_dwNumMaterials, &pMesh ) ) if( FAILED( hr ) ) goto End; // Go to error handling // Set epsilon values Epsilons.Normal = 0.001; Epsilons.Position = 0.1; // Weld the vertices for( i=0; i<65536; i++ ) { pFaceRemap[i] = 0; } hr = D3DXWeldVertices ( pMesh, D3DXWELDEPSILONS_WELDPARTIALMATCHES, &Epsilons, (DWORD*)pAdjacencyBuffer->GetBufferPointer(), (DWORD*)pAdjacencyBuffer->GetBufferPointer(), (DWORD*)pFaceRemap, NULL ) if( FAILED( hr ) ) goto End; // Go to error handling . . .
Function Information
Header d3dx9mesh.h Import library d3dx9.lib Minimum operating systems Windows 98