directx中第四卷

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渐进网格

声明变量

ID3DXPMesh* PMesh = 0;

产生渐进网格

加载模型hr = SourceMesh->OptimizeInplace(    D3DXMESHOPT_ATTRSORT|    D3DXMESHOPT_COMPACT|    D3DXMESHOPT_VERTEXCACHE,    (DWORD*)adjbuffer->GetBufferPointer(),    (DWORD*)adjbuffer->GetBufferPointer(), //添加上优化后的邻接数组指针    0,0    );if (FAILED(hr)){    ::MessageBox(0, "OptimizeInplace-lost", 0, 0);    return false;}//由原网格生成渐进网格（网格指针，优化前的邻接数组指针，默认顶点属性权重，默认顶点权重，尽可能简化，简化面数，把结果存到网格指针）hr = D3DXGeneratePMesh(    SourceMesh,    (DWORD*)adjbuffer->GetBufferPointer(),    0,0,1,    D3DXMESHSIMP_FACE,    &PMesh    );if (FAILED(hr)){    ::MessageBox(0, "D3DXGeneratePMesh-lost", 0, 0);    return false;}adjbuffer->Release();//得到最大细节DWORD maxfaces = PMesh->GetMaxFaces();//设置细节PMesh->SetNumFaces(maxfaces);

绘制模型

for (int i = 0; i < Mtrls.size(); i++){    g_pd3dDevice->SetMaterial(&Mtrls[i]);    g_pd3dDevice->SetTexture(0, Textures[i]);    PMesh->DrawSubset(i);    //绘制网格骨架，为了看到效果    g_pd3dDevice->SetMaterial(&yellow_mtrl);    g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);    PMesh->DrawSubset(i);    g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);}

调整效果

int numfaces = PMesh->GetNumFaces();if (::GetAsyncKeyState('A')&0x8000f){    PMesh->SetNumFaces(numfaces + 10);}if (::GetAsyncKeyState('S')&0x8000f){    PMesh->SetNumFaces(numfaces - 10);}

效果

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