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#
# This example shows how to add an observer to a Tcl program. It extends
# the Step1/Tcl/Cone.tcl Tcl example (see that example for information on
# the basic setup).
#
# VTK uses a command/observer design pattern. That is, observers watch for
# particular events that any vtkObject (or subclass) may invoke on
# itself. For example, the vtkRenderer invokes a "StartEvent" as it begins
# to render. Here we add an observer that invokes a command when this event
# is observed.
#
#
# First we include the VTK Tcl packages which will make available
# all of the vtk commands to Tcl
#
package require vtk
#
# Here we define our callback
#
proc myCallback {} {
puts "Starting to render"
}
#
# Next we create the pipelinne
#
vtkConeSource cone
cone SetHeight 3.0
cone SetRadius 1.0
cone SetResolution 10
vtkPolyDataMapper coneMapper
coneMapper SetInputConnection [cone GetOutputPort]
vtkActor coneActor
coneActor SetMapper coneMapper
vtkRenderer ren1
ren1 AddActor coneActor
ren1 SetBackground 0.1 0.2 0.4
# here we setup the callback
ren1 AddObserver StartEvent myCallback
vtkRenderWindow renWin
renWin AddRenderer ren1
renWin SetSize 300 300
#
# now we loop over 360 degreeees and render the cone each time
#
for {set i 0} {$i < 360} {incr i} {
after 10
# render the image
renWin Render
# rotate the active camera by one degree
[ren1 GetActiveCamera] Azimuth 1
}
#
# Free up any objects we created
#
vtkCommand DeleteAllObjects
#
# exit the application
#
exit
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