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

vtkTexturedSphereSource tss
  tss SetThetaResolution 18
  tss SetPhiResolution 9
vtkPolyDataMapper   earthMapper
  earthMapper SetInputConnection [tss GetOutputPort]
vtkActor earthActor
  earthActor SetMapper earthMapper

# load in the texture map
#
vtkTexture atext
vtkPNMReader pnmReader
  pnmReader SetFileName "$VTK_DATA_ROOT/Data/earth.ppm"

atext SetInputConnection [pnmReader GetOutputPort]
atext InterpolateOn
earthActor SetTexture atext

# create a earth source and actor
#
vtkEarthSource es
  es SetRadius 0.501
  es SetOnRatio 2
vtkPolyDataMapper   earth2Mapper
  earth2Mapper SetInputConnection [es GetOutputPort]
vtkActor earth2Actor
  earth2Actor SetMapper earth2Mapper

# Add the actors to the renderer, set the background and size
#
ren1 AddActor earthActor
ren1 AddActor earth2Actor
ren1 SetBackground 0 0 0.1
renWin SetSize 300 300

# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
ren1 ResetCamera
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.4
iren Initialize

# prevent the tk window from showing up then start the event loop
wm withdraw .