The program crashed when I changed the view point with my mouse
At that time QVtkWidget is playing a point cloud continuously, the viewpoint could not be used when it is displaying something?
Hi and welcome to devnet forum
To my understanding is the QVtkWidget part of https://www.vtk.org/ basically only using Qt libs. Probably your question is better raised in the forum or mailing list there.
Otherwise when the problem occurs in a Qt source part of your own, you need to post some source snippet showing how you are using Qt and where the problem may be.