/usr/share/vtk/Rendering/Tcl/Cylinder.tcl is in vtk-examples 5.8.0-17.5.
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# This simple example shows how to do basic rendering and pipeline
# creation.
#
# We start off by loading some Tcl modules. One is the basic VTK library;
# the second is a package for rendering, and the last includes a set
# of color definitions.
#
package require vtk
package require vtkinteraction
package require vtktesting
# This creates a polygonal cylinder model with eight circumferential facets.
#
vtkCylinderSource cylinder
cylinder SetResolution 8
# The mapper is responsible for pushing the geometry into the graphics
# library. It may also do color mapping, if scalars or other attributes
# are defined.
#
vtkPolyDataMapper cylinderMapper
cylinderMapper SetInputConnection [cylinder GetOutputPort]
# The actor is a grouping mechanism: besides the geometry (mapper), it
# also has a property, transformation matrix, and/or texture map.
# Here we set its color and rotate it -22.5 degrees.
vtkActor cylinderActor
cylinderActor SetMapper cylinderMapper
eval [cylinderActor GetProperty] SetColor $tomato
cylinderActor RotateX 30.0
cylinderActor RotateY -45.0
# Create the graphics structure. The renderer renders into the
# render window. The render window interactor captures mouse events
# and will perform appropriate camera or actor manipulation
# depending on the nature of the events.
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actors to the renderer, set the background and size
#
ren1 AddActor cylinderActor
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 200 200
# The next line associates a Tcl proc with a "keypress-u" event
# in the rendering window. In this case the proc deiconifies the
# .vtkInteract Tk form that was defined when we loaded
# "package require vtkinteraction".
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# This allows the interactor to initalize itself. It has to be
# called before an event loop. In this example, we allow Tk to
# start the event loop (this is done automatically by Tk after
# the user script is executed).
iren Initialize
# We'll zoom in a little by accessing the camera and invoking a "Zoom"
# method on it.
ren1 ResetCamera
[ren1 GetActiveCamera] Zoom 1.5
renWin Render
# prevent the tk window from showing up then start the event loop
wm withdraw .
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