[vtkusers] problem about user defined subclass of vtkCamera&In-Reply-To=<s8f49da2.027 at gue-w23s-

[Yanbing Hu]

found the answer. directly inherit from vtkCamera doesn't work since it
provides empty implementation for two of its member function (render(),
updataviewport()). if inherit from vtkOpenGLCamera, it works fine

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