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126 lines
3.7 KiB
126 lines
3.7 KiB
package require vtk
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package require vtkinteraction
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package require vtktesting
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# Perform psuedo volume rendering in a structured grid by compositing
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# translucent cut planes. This same trick can be used for unstructured
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# grids. Note that for better results, more planes can be created. Also,
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# if your data is vtkImageData, there are much faster methods for volume
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# rendering.
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# Create pipeline. Read structured grid data.
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#
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vtkPLOT3DReader pl3d
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pl3d SetXYZFileName "$VTK_DATA_ROOT/Data/combxyz.bin"
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pl3d SetQFileName "$VTK_DATA_ROOT/Data/combq.bin"
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pl3d SetScalarFunctionNumber 100
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pl3d SetVectorFunctionNumber 202
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pl3d Update
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# A convenience, use this filter to limit data for experimentation.
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vtkExtractGrid extract
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extract SetVOI 1 55 -1000 1000 -1000 1000
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extract SetInputConnection [pl3d GetOutputPort]
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# The (implicit) plane is used to do the cutting
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vtkPlane plane
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plane SetOrigin 0 4 2
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plane SetNormal 0 1 0
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# The cutter is set up to process each contour value over all cells
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# (SetSortByToSortByCell). This results in an ordered output of polygons
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# which is key to the compositing.
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vtkCutter cutter
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cutter SetInputConnection [extract GetOutputPort]
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cutter SetCutFunction plane
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cutter GenerateCutScalarsOff
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cutter SetSortByToSortByCell
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vtkLookupTable clut
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clut SetHueRange 0 .67
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clut Build
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vtkPolyDataMapper cutterMapper
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cutterMapper SetInputConnection [cutter GetOutputPort]
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cutterMapper SetScalarRange .18 .7
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cutterMapper SetLookupTable clut
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vtkActor cut
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cut SetMapper cutterMapper
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# Add in some surface geometry for interest.
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vtkContourFilter iso
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iso SetInputConnection [pl3d GetOutputPort]
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iso SetValue 0 .22
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vtkPolyDataNormals normals
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normals SetInputConnection [iso GetOutputPort]
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normals SetFeatureAngle 45
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vtkPolyDataMapper isoMapper
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isoMapper SetInputConnection [normals GetOutputPort]
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isoMapper ScalarVisibilityOff
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vtkActor isoActor
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isoActor SetMapper isoMapper
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eval [isoActor GetProperty] SetDiffuseColor $tomato
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eval [isoActor GetProperty] SetSpecularColor $white
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eval [isoActor GetProperty] SetDiffuse .8
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eval [isoActor GetProperty] SetSpecular .5
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eval [isoActor GetProperty] SetSpecularPower 30
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vtkStructuredGridOutlineFilter outline
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outline SetInputConnection [pl3d GetOutputPort]
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vtkTubeFilter outlineTubes
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outlineTubes SetInputConnection [outline GetOutputPort]
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outlineTubes SetRadius .1
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vtkPolyDataMapper outlineMapper
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outlineMapper SetInputConnection [outlineTubes GetOutputPort]
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vtkActor outlineActor
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outlineActor SetMapper outlineMapper
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# Create the RenderWindow, Renderer and Interactor
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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 outlineActor
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eval [outlineActor GetProperty] SetColor $banana
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ren1 AddActor isoActor
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isoActor VisibilityOn
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ren1 AddActor cut
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set opacity .1
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[cut GetProperty] SetOpacity 1
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ren1 SetBackground 1 1 1
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renWin SetSize 640 480
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set cam1 [ren1 GetActiveCamera]
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$cam1 SetClippingRange 3.95297 50
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$cam1 SetFocalPoint 9.71821 0.458166 29.3999
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$cam1 SetPosition 2.7439 -37.3196 38.7167
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$cam1 ComputeViewPlaneNormal
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$cam1 SetViewUp -0.16123 0.264271 0.950876
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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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# Cut: generates n cut planes normal to camera's view plane
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#
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proc Cut {n} {
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global cam1 opacity
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eval plane SetNormal [$cam1 GetViewPlaneNormal]
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eval plane SetOrigin [$cam1 GetFocalPoint]
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eval cutter GenerateValues $n -5 5
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clut SetAlphaRange $opacity $opacity
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renWin Render
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}
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# Generate 10 cut planes
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Cut 20
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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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