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105 lines
3.3 KiB
105 lines
3.3 KiB
# This example demonstrates how to use boolean combinations of implicit
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# functions to create a model of an ice cream cone.
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# first we load in the standard vtk packages into tcl
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package require vtk
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package require vtkinteraction
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package require vtktesting
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# Create implicit function primitives. These have been carefully placed to
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# give the effect that we want. We are going to use various combinations of
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# these functions to create the shape we want; for example, we use planes
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# intersected with a cone (which is infinite in extent) to get a finite
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# cone.
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#
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vtkCone cone
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cone SetAngle 20
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vtkPlane vertPlane
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vertPlane SetOrigin .1 0 0
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vertPlane SetNormal -1 0 0
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vtkPlane basePlane
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basePlane SetOrigin 1.2 0 0
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basePlane SetNormal 1 0 0
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vtkSphere iceCream
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iceCream SetCenter 1.333 0 0
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iceCream SetRadius 0.5
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vtkSphere bite
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bite SetCenter 1.5 0 0.5
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bite SetRadius 0.25
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# Combine primitives to build ice-cream cone. Clip the cone with planes.
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vtkImplicitBoolean theCone
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theCone SetOperationTypeToIntersection
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theCone AddFunction cone
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theCone AddFunction vertPlane
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theCone AddFunction basePlane
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# Take a bite out of the ice cream.
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vtkImplicitBoolean theCream
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theCream SetOperationTypeToDifference
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theCream AddFunction iceCream
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theCream AddFunction bite
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# The sample function generates a distance function from the
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# implicit function (which in this case is the cone). This is
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# then contoured to get a polygonal surface.
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#
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vtkSampleFunction theConeSample
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theConeSample SetImplicitFunction theCone
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theConeSample SetModelBounds -1 1.5 -1.25 1.25 -1.25 1.25
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theConeSample SetSampleDimensions 60 60 60
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theConeSample ComputeNormalsOff
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vtkContourFilter theConeSurface
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theConeSurface SetInputConnection [theConeSample GetOutputPort]
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theConeSurface SetValue 0 0.0
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vtkPolyDataMapper coneMapper
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coneMapper SetInputConnection [theConeSurface GetOutputPort]
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coneMapper ScalarVisibilityOff
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vtkActor coneActor
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coneActor SetMapper coneMapper
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eval [coneActor GetProperty] SetColor $chocolate
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# The same here for the ice cream.
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#
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vtkSampleFunction theCreamSample
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theCreamSample SetImplicitFunction theCream
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theCreamSample SetModelBounds 0 2.5 -1.25 1.25 -1.25 1.25
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theCreamSample SetSampleDimensions 60 60 60
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theCreamSample ComputeNormalsOff
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vtkContourFilter theCreamSurface
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theCreamSurface SetInputConnection [theCreamSample GetOutputPort]
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theCreamSurface SetValue 0 0.0
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vtkPolyDataMapper creamMapper
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creamMapper SetInputConnection [theCreamSurface GetOutputPort]
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creamMapper ScalarVisibilityOff
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vtkActor creamActor
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creamActor SetMapper creamMapper
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eval [creamActor GetProperty] SetColor $mint
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# Create the usual rendering stuff
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#
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# Add the actors to the renderer, set the background and size
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#
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ren1 AddActor coneActor
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ren1 AddActor creamActor
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ren1 SetBackground 1 1 1
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renWin SetSize 250 250
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ren1 ResetCamera
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[ren1 GetActiveCamera] Roll 90
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[ren1 GetActiveCamera] Dolly 1.5
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ren1 ResetCameraClippingRange
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iren Initialize
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# render the image
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#
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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renWin Render
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# prevent the tk window from showing up then start the event loop
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wm withdraw .
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