how coprocess render the image for distributed cases

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Only vtkCPProcessor::Initialize(vtkMPICommunicatorOpaqueComm& comm, const char* workingDirectory) does, but we are not calling this version. We are calling the version that only takes a workingDirectory argument.

EDIT: after checking, we can confirm that Initialize (the version we call) does indeed modify the controller. Should we set the global controller after creating the vtkCPProcessor?