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/usr/lib/tcltk/vtk-6.3/vtkinteraction/vtkinteraction.tcl is in tcl-vtk6 6.3.0+dfsg1-5.

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package require -exact vtkrenderingcore 6.3
package require -exact vtkrenderingopengl 6.3

# 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 6.3