Abstract: Mesh component selection is one of the most common tasks in the 3D modeling process. However, even the latest 3D software packages still lack high-level component selection schemes. This makes users suffer from frequent mouse actions with precise control. We present a tool to select a set of vertices or edges along a line in the given mesh with ease. Because it mimics the behavior of the boundary selection tool of a popular image editing software, users can intuitively understand how to use it. A few real-world application examples are also shown, with the user discussions.