如何獲取點數據的邊界框？

Question

如何獲取數據集的範圍？也稱爲數據的邊界框。數據與StructuredPointsReader一起閱讀。

Answer 1

因爲vtkStructuredPoints（vtkStructuredPointsReader上的GetOutput（）類型）是vtkDataSet的子類，所以可以使用vtkDataSet的GetBounds（double [6]）函數。這裏是一個例子：

double bounds[6]; 
    structuredPointsReader->Update(); 
    structuredPointsReader->GetOutput()->GetBounds(bounds); 

    std::cout << "xmin: " << bounds[0] << " " 
      << "xmax: " << bounds[1] << std::endl 
      << "ymin: " << bounds[2] << " " 
      << "ymax: " << bounds[3] << std::endl 
      << "zmin: " << bounds[4] << " " 
      << "zmax: " << bounds[5] << std::endl;