[how to]How to input const uint32_t* adjacency

[orangeagain]

I know mesh base on vertex and triangle index, but where is adjacency from?

    HRESULT __cdecl UVAtlasCreate(
        _In_reads_(nVerts)                  const XMFLOAT3* positions,
        _In_                                size_t nVerts,
        _When_(indexFormat == DXGI_FORMAT_R16_UINT, _In_reads_bytes_(nFaces * sizeof(uint16_t)))
        _When_(indexFormat != DXGI_FORMAT_R16_UINT, _In_reads_bytes_(nFaces * sizeof(uint32_t))) const void* indices,
        _In_                                DXGI_FORMAT indexFormat,
        _In_                                size_t nFaces,
        _In_                                size_t maxChartNumber,
        _In_                                float maxStretch,
        _In_                                size_t width,
        _In_                                size_t height,
        _In_                                float gutter,
        _In_reads_(nFaces * 3)                const uint32_t* adjacency,
        _In_reads_opt_(nFaces * 3)            const uint32_t* falseEdgeAdjacency,
        _In_reads_opt_(nFaces * 3)            const float* pIMTArray,
        _In_opt_                            std::function<HRESULT __cdecl(float percentComplete)> statusCallBack,
        _In_                                float callbackFrequency,
        _In_                                UVATLAS options,
        _Inout_ std::vector<UVAtlasVertex>& vMeshOutVertexBuffer,
        _Inout_ std::vector<uint8_t>& vMeshOutIndexBuffer,
        _Inout_opt_ std::vector<uint32_t>* pvFacePartitioning = nullptr,
        _Inout_opt_ std::vector<uint32_t>* pvVertexRemapArray = nullptr,
        _Out_opt_                           float* maxStretchOut = nullptr,
        _Out_opt_                           size_t* numChartsOut = nullptr);

[walbourn]

Per the documentation wiki you can use DirectXMesh's GenerateAdjacencyAndPointReps to compute it.

[orangeagain]

Per the documentation wiki you can use DirectXMesh's GenerateAdjacencyAndPointReps to compute it.

Can I input empty to it?

[walbourn]

Face-adjacency information is required for the algorithm.