Direct3D 9学习笔记(11)网格(Mesh)2

网格优化与邻接

最新推荐文章于 2022-05-16 22:11:02 发布

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最新推荐文章于 2022-05-16 22:11:02 发布

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本文介绍了一种通过优化网格来生成属性表的方法，并展示了如何利用邻接信息进行网格克隆的过程。具体包括网格优化参数设置、邻接信息的获取及展示、以及网格克隆的具体实现。

七.网格优化

参数解释:

示例:

//
// Optimize the mesh to generate an attribute table.
//

std::vector<DWORD> adjacencyBuffer(Mesh->GetNumFaces() * 3);
Mesh->GenerateAdjacency(0.0f, &adjacencyBuffer[0]);

hr = Mesh->OptimizeInplace(        
    D3DXMESHOPT_ATTRSORT |
    D3DXMESHOPT_COMPACT  |
    D3DXMESHOPT_VERTEXCACHE,
    &adjacencyBuffer[0],
    0, 0, 0);

八.属性表

九.邻接信息

示例:

void dumpAdjacencyBuffer(std::ofstream& outFile, ID3DXMesh* mesh)
{
    outFile << "Adjacency Buffer:" << std::endl;
    outFile << "-----------------" << std::endl << std::endl;

    // three enttries per face
    std::vector<DWORD> adjacencyBuffer(mesh->GetNumFaces() * 3);

    mesh->GenerateAdjacency(0.0f, &adjacencyBuffer[0]);

    for(int i = 0; i < mesh->GetNumFaces(); i++)
    {
        outFile << "Triangle's adjacent to triangle " << i << ": ";
        outFile << adjacencyBuffer[i * 3    ] << " ";
        outFile << adjacencyBuffer[i * 3 + 1] << " ";
        outFile << adjacencyBuffer[i * 3 + 2] << std::endl;
    }

    outFile << std::endl << std::endl;
}

十.网格克隆

HRESULT CloneMesh(
    [in]           DWORD Options,
    [in]           const D3DVERTEXELEMENT9 *pDeclaration,
    [in]           LPDIRECT3DDEVICE9 pDevice,
    [out, retval]  LPD3DXMESH *ppCloneMesh
    );