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package require vtk
package require vtkinteraction
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# avoid the singularity at the Z axis using 0.0001 radian offset
vtkPlaneSource plane
plane SetOrigin 1.0 0.0 -1.0
plane SetPoint1 1.0 6.28318530719 -1.0
plane SetPoint2 1.0 0.0 1.0
plane SetXResolution 19
plane SetYResolution 9
vtkCylindricalTransform transform
vtkTransformPolyDataFilter tpoly
tpoly SetInputConnection [plane GetOutputPort]
tpoly SetTransform transform
vtkTransformPolyDataFilter tpoly2
tpoly2 SetInputConnection [tpoly GetOutputPort]
tpoly2 SetTransform [transform GetInverse]
# also cover the inverse transformation by going back and forth
vtkTransformPolyDataFilter tpoly3
tpoly3 SetInputConnection [tpoly2 GetOutputPort]
tpoly3 SetTransform transform
vtkDataSetMapper mapper
mapper SetInputConnection [tpoly3 GetOutputPort]
vtkPNMReader earth
earth SetFileName "$VTK_DATA_ROOT/Data/earth.ppm"
vtkTexture texture
texture SetInputConnection [earth GetOutputPort]
texture InterpolateOn
vtkActor world
world SetMapper mapper
world SetTexture texture
# Add the actors to the renderer, set the background and size
#
ren1 AddActor world
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 300 300
[ren1 GetActiveCamera] SetPosition 8 -10 6
[ren1 GetActiveCamera] SetFocalPoint 0 0 0
[ren1 GetActiveCamera] SetViewAngle 15
[ren1 GetActiveCamera] SetViewUp 0.0 0.0 1.0
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.4
ren1 ResetCameraClippingRange
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
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