PCL点云选点操作，可以作为参考，是一个控制台程序，作适当修改可以嵌入到Qt中，实现选点操作。-PCL point cloud sourcing operation can be as a reference, is a console application, make appropriate modifications can be embedded to QT to achieve sourcing operation.

用VTK显示一个圆柱体，再把VTK窗口嵌入到QT界面中(A cylinder is displayed with VTK and the VTK window is embedded in the QT interface.)