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Utkarsh Ayachit authored
Adding support for logging using vtkLogger in ParaView. * command line options (-v) enable users to specify log verbosity for messages shown on stderr by default. * command line options (-l) allow users to request multiple log files with different verbosities. * vtkPVLogger implements a category-based logging framework that allows users to elevate log levels for predefined categories at runtime using environment variables. * proxies support a logname attribute that gets set with user friendly name to make it easier to interpret log messages.
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