Removing the wrong surface after running Poisson Reconstruction in PCL

  3d-reconstruction, c++, point-cloud-library, windows

I have a similar problem like link. But I used the Poisson Reconstruction algorithm in PCL instead of MeshLab to reconstruct a box. I got a mesh with some extened surface as shown in this image.I want to remove the extened surface now.
enter image description here

I do not understand the answer to the above question,and I don’t want to modify the source code of PCL.
Is there any other way to solve this problem? The version of PCL in my computer is 1.10.

Any suggestions will be appreciated.

Source: Windows Questions