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90 lines
2.5 KiB
90 lines
2.5 KiB
# This example shows how to construct a surface from a point cloud. First
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# we generate a volume using the vtkSurfaceReconstructionFilter. The volume
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# values are a distance field. Once this is generated, the volume is
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# countoured at a distance value of 0.0.
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#
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package require vtk
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package require vtkinteraction
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# Read some points. Use a programmable filter to read them.
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#
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vtkProgrammableSource pointSource
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pointSource SetExecuteMethod readPoints
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proc readPoints {} {
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global VTK_DATA_ROOT
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set output [pointSource GetPolyDataOutput]
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vtkPoints points
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$output SetPoints points
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set file [open "$VTK_DATA_ROOT/Data/cactus.3337.pts" r]
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while { [gets $file line] != -1 } {
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scan $line "%s" firstToken
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if { $firstToken == "p" } {
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scan $line "%s %f %f %f" firstToken x y z
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points InsertNextPoint $x $y $z
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}
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}
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points Delete; #okay, reference counting
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}
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# Construct the surface and create isosurface.
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#
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vtkSurfaceReconstructionFilter surf
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surf SetInputConnection [pointSource GetOutputPort]
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vtkContourFilter cf
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cf SetInputConnection [surf GetOutputPort]
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cf SetValue 0 0.0
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# Sometimes the contouring algorithm can create a volume whose gradient
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# vector and ordering of polygon (using the right hand rule) are
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# inconsistent. vtkReverseSense cures this problem.
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vtkReverseSense reverse
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reverse SetInputConnection [cf GetOutputPort]
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reverse ReverseCellsOn
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reverse ReverseNormalsOn
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vtkPolyDataMapper map
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map SetInputConnection [reverse GetOutputPort]
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map ScalarVisibilityOff
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vtkActor surfaceActor
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surfaceActor SetMapper map
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[surfaceActor GetProperty] SetDiffuseColor 1.0000 0.3882 0.2784
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[surfaceActor GetProperty] SetSpecularColor 1 1 1
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[surfaceActor GetProperty] SetSpecular .4
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[surfaceActor GetProperty] SetSpecularPower 50
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# Create the RenderWindow, Renderer and both Actors
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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 surfaceActor
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ren1 SetBackground 1 1 1
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renWin SetSize 400 400
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[ren1 GetActiveCamera] SetFocalPoint 0 0 0
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[ren1 GetActiveCamera] SetPosition 1 0 0
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[ren1 GetActiveCamera] SetViewUp 0 0 1
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ren1 ResetCamera
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[ren1 GetActiveCamera] Azimuth 20
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[ren1 GetActiveCamera] Elevation 30
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[ren1 GetActiveCamera] Dolly 1.2
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ren1 ResetCameraClippingRange
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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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