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# This example demonstrates adding two implicit models
# to produce an (unexpected!) result
# first we load in the standard vtk packages into tcl
package require vtk
package require vtkinteraction
package require vtktesting
vtkCone geomObject1
vtkSphere geomObject2
geomObject2 SetRadius 0.5
geomObject2 SetCenter 0.5 0 0
vtkImplicitSum sum
sum SetNormalizeByWeight 1
sum AddFunction geomObject1 2
sum AddFunction geomObject2 1
vtkSampleFunction sample
sample SetImplicitFunction sum
sample SetSampleDimensions 60 60 60
sample ComputeNormalsOn
vtkContourFilter surface
surface SetInputConnection [sample GetOutputPort]
surface SetValue 0 0.0
vtkPolyDataMapper mapper
mapper SetInputConnection [surface GetOutputPort]
mapper ScalarVisibilityOff
vtkActor actor
actor SetMapper mapper
eval [actor GetProperty] SetDiffuseColor 0.2 0.4 0.6
eval [actor GetProperty] SetSpecular 0.4
eval [actor GetProperty] SetDiffuse 0.7
eval [actor GetProperty] SetSpecularPower 40
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 actor
ren1 SetBackground 1 1 1
renWin SetSize 300 300
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 60
[ren1 GetActiveCamera] Elevation -10
[ren1 GetActiveCamera] Dolly 1.5
ren1 ResetCameraClippingRange
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
renWin Render
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