DirectXMesh几何处理库
DirectXMesh 是微软开发的 DirectX 的几何处理库。
示例代码：
std::unique_ptr<WaveFrontReader<uint16_t>> mesh( new WaveFrontReader<uint16_t>() );
if ( FAILED( mesh->Load( L"test.obj" ) ) )
// Error
if ( mesh->hasNormals )
// Skip next computation
size_t nFaces = mesh->indices.size() / 3;
size_t nVerts = mesh->vertices.size();
std::unique_ptr<XMFLOAT3[]> pos( new XMFLOAT3[ nVerts ] );
for( size_t j = 0; j < nVerts; ++j )
pos[ j ] = mesh->vertices[ j ].position;
std::unique_ptr<XMFLOAT3[]> normals( new XMFLOAT3[ nVerts ] );
if ( FAILED( ComputeNormals( &mesh->indices.front(), nFaces, pos.get(), nVerts, CNORM_DEFAULT, normals.get() ) ) )
// Error
if ( !mesh->hasTexcoords )
// Skip next computation
std::unique_ptr<XMFLOAT2[]> texcoords( new XMFLOAT2[ nVerts ] );
for( size_t j = 0; j < nVerts; ++j )
texcoords[ j ] = mesh->vertices[ j ].textureCoordinate;
std::unique_ptr<XMFLOAT3[]> tangents( new XMFLOAT3[ nVerts ] );
std::unique_ptr<XMFLOAT3[]> bitangents( new XMFLOAT3[ nVerts ] );
if ( FAILED( ComputeTangentFrame( &mesh->indices.front(), nFaces,
pos.get(), normals.get(), texcoords.get(), nVerts,
tangents.get(), bitangents.get() ) ) )
// Error
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