package require vtk
package require vtkinteraction
package require vtktesting

vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin

# create a sphere source and actor
#
vtkSphereSource sphere
vtkPolyDataMapper   sphereMapper
    sphereMapper SetInputConnection [sphere GetOutputPort]
vtkLODActor sphereActor
    sphereActor SetMapper sphereMapper
eval [sphereActor GetProperty] SetDiffuseColor $banana
eval [sphereActor GetProperty] SetSpecular .4
eval [sphereActor GetProperty] SetSpecularPower 20

# create the spikes using a cone source and the sphere source
#
vtkConeSource cone
  cone SetResolution 20
vtkGlyph3D glyph
    glyph SetInputConnection [sphere GetOutputPort]
    glyph SetSource [cone GetOutput]
    glyph SetVectorModeToUseNormal
    glyph SetScaleModeToScaleByVector
    glyph SetScaleFactor 0.25
vtkPolyDataMapper spikeMapper
    spikeMapper SetInputConnection [glyph GetOutputPort]
vtkLODActor spikeActor
    spikeActor SetMapper spikeMapper
eval [spikeActor GetProperty] SetDiffuseColor $tomato
eval [spikeActor GetProperty] SetSpecular .4
eval [spikeActor GetProperty] SetSpecularPower 20

# Add the actors to the renderer, set the background and size
#
ren1 AddActor sphereActor
ren1 AddActor spikeActor
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 300 300

# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
ren1 ResetCamera
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.4
$cam1 Azimuth 30
$cam1 Elevation 30
renWin Render

iren FlyTo ren1 0.37723 0.154699 0.204326

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