package require -exact vtkio 5.0 package require -exact vtkrendering 5.0 if {[info commands ::vtk::init::require_package] != ""} { if {[::vtk::init::require_package vtkParallelTCL 5.0]} { package provide vtkparallel 5.0 } } else { if {[info commands vtkParallelFactory] != "" || [::vtk::load_component vtkParallelTCL] == ""} { package provide vtkparallel 5.0 } }