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/usr/lib/vtk-5.8/tcl/vtkinteraction/vtkinteraction.tcl is in tcl-vtk 5.8.0-5.

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package require -exact vtkrendering 5.8

# We need Tk to implement the interactive features.
package require Tk

# Load the interaction features.
foreach s {Interactor bindings-rw bindings-iw bindings setget} {
  source [file join [file dirname [info script]] "${s}.tcl"]
}

package provide vtkinteraction 5.8