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196 lines
7.3 KiB
196 lines
7.3 KiB
package require vtk
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package require vtkinteraction
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#
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# This example reads a volume dataset, extracts two isosurfaces that
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# represent the skin and bone, creates three orthogonal planes (saggital,
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# axial, coronal), and displays them.
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#
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# Create the renderer, the render window, and the interactor. The renderer
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# draws into the render window, the interactor enables mouse- and
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# keyboard-based interaction with the scene.
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#
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vtkRenderer aRenderer
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vtkRenderWindow renWin
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renWin AddRenderer aRenderer
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# The following reader is used to read a series of 2D slices (images)
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# that compose the volume. The slice dimensions are set, and the
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# pixel spacing. The data Endianness must also be specified. The reader
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# usese the FilePrefix in combination with the slice number to construct
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# filenames using the format FilePrefix.%d. (In this case the FilePrefix
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# is the root name of the file: quarter.)
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vtkVolume16Reader v16
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v16 SetDataDimensions 64 64
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v16 SetDataByteOrderToLittleEndian
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v16 SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
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v16 SetImageRange 1 93
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v16 SetDataSpacing 3.2 3.2 1.5
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# An isosurface, or contour value of 500 is known to correspond to the
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# skin of the patient. Once generated, a vtkPolyDataNormals filter is
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# is used to create normals for smooth surface shading during rendering.
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# The triangle stripper is used to create triangle strips from the
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# isosurface these render much faster on may systems.
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vtkContourFilter skinExtractor
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skinExtractor SetInputConnection [v16 GetOutputPort]
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skinExtractor SetValue 0 500
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vtkPolyDataNormals skinNormals
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skinNormals SetInputConnection [skinExtractor GetOutputPort]
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skinNormals SetFeatureAngle 60.0
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vtkStripper skinStripper
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skinStripper SetInputConnection [skinNormals GetOutputPort]
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vtkPolyDataMapper skinMapper
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skinMapper SetInputConnection [skinStripper GetOutputPort]
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skinMapper ScalarVisibilityOff
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vtkActor skin
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skin SetMapper skinMapper
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[skin GetProperty] SetDiffuseColor 1 .49 .25
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[skin GetProperty] SetSpecular .3
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[skin GetProperty] SetSpecularPower 20
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# An isosurface, or contour value of 1150 is known to correspond to the
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# skin of the patient. Once generated, a vtkPolyDataNormals filter is
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# is used to create normals for smooth surface shading during rendering.
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# The triangle stripper is used to create triangle strips from the
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# isosurface these render much faster on may systems.
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vtkContourFilter boneExtractor
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boneExtractor SetInputConnection [v16 GetOutputPort]
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boneExtractor SetValue 0 1150
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vtkPolyDataNormals boneNormals
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boneNormals SetInputConnection [boneExtractor GetOutputPort]
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boneNormals SetFeatureAngle 60.0
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vtkStripper boneStripper
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boneStripper SetInputConnection [boneNormals GetOutputPort]
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vtkPolyDataMapper boneMapper
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boneMapper SetInputConnection [boneStripper GetOutputPort]
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boneMapper ScalarVisibilityOff
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vtkActor bone
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bone SetMapper boneMapper
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[bone GetProperty] SetDiffuseColor 1 1 .9412
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# An outline provides context around the data.
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#
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vtkOutlineFilter outlineData
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outlineData SetInputConnection [v16 GetOutputPort]
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vtkPolyDataMapper mapOutline
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mapOutline SetInputConnection [outlineData GetOutputPort]
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vtkActor outline
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outline SetMapper mapOutline
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[outline GetProperty] SetColor 0 0 0
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# Now we are creating three orthogonal planes passing through the
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# volume. Each plane uses a different texture map and therefore has
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# diferent coloration.
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# Start by creatin a black/white lookup table.
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vtkLookupTable bwLut
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bwLut SetTableRange 0 2000
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bwLut SetSaturationRange 0 0
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bwLut SetHueRange 0 0
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bwLut SetValueRange 0 1
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# Now create a lookup table that consists of the full hue circle (from HSV).
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vtkLookupTable hueLut
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hueLut SetTableRange 0 2000
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hueLut SetHueRange 0 1
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hueLut SetSaturationRange 1 1
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hueLut SetValueRange 1 1
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# Finally, create a lookup table with a single hue but having a range
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# in the saturation of the hue.
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vtkLookupTable satLut
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satLut SetTableRange 0 2000
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satLut SetHueRange .6 .6
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satLut SetSaturationRange 0 1
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satLut SetValueRange 1 1
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# Create the first of the three planes. The filter vtkImageMapToColors
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# maps the data through the corresponding lookup table created above.
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# The vtkImageActor is a type of vtkProp and conveniently displays an image
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# on a single quadrilateral plane. It does this using texture mapping and
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# as a result is quite fast. (Note: the input image has to be unsigned
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# char values, which the vtkImageMapToColors produces.) Note also that
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# by specifying the DisplayExtent, the pipeline requests data of this
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# extent and the vtkImageMapToColors only processes a slice of data.
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vtkImageMapToColors saggitalColors
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saggitalColors SetInputConnection [v16 GetOutputPort]
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saggitalColors SetLookupTable bwLut
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vtkImageActor saggital
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saggital SetInput [saggitalColors GetOutput]
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saggital SetDisplayExtent 32 32 0 63 0 92
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# Create the second (axial) plane of the three planes. We use the same
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# approach as before except that the extent differs.
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vtkImageMapToColors axialColors
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axialColors SetInputConnection [v16 GetOutputPort]
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axialColors SetLookupTable hueLut
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vtkImageActor axial
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axial SetInput [axialColors GetOutput]
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axial SetDisplayExtent 0 63 0 63 46 46
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# Create the third (coronal) plane of the three planes. We use the same
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# approach as before except that the extent differs.
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vtkImageMapToColors coronalColors
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coronalColors SetInputConnection [v16 GetOutputPort]
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coronalColors SetLookupTable satLut
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vtkImageActor coronal
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coronal SetInput [coronalColors GetOutput]
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coronal SetDisplayExtent 0 63 32 32 0 92
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# It is convenient to create an initial view of the data. The FocalPoint
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# and Position form a vector direction. Later on (ResetCamera() method)
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# this vector is used to position the camera to look at the data in
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# this direction.
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vtkCamera aCamera
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aCamera SetViewUp 0 0 -1
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aCamera SetPosition 0 1 0
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aCamera SetFocalPoint 0 0 0
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aCamera ComputeViewPlaneNormal
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# Actors are added to the renderer.
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aRenderer AddActor outline
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aRenderer AddActor saggital
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aRenderer AddActor axial
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aRenderer AddActor coronal
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aRenderer AddActor axial
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aRenderer AddActor coronal
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aRenderer AddActor skin
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aRenderer AddActor bone
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# Turn off bone for this example.
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bone VisibilityOff
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# Set skin to semi-transparent.
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[skin GetProperty] SetOpacity 0.5
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# An initial camera view is created. The Dolly() method moves
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# the camera towards the FocalPoint, thereby enlarging the image.
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aRenderer SetActiveCamera aCamera
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aRenderer ResetCamera
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aCamera Dolly 1.5
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# Set a background color for the renderer and set the size of the
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# render window (expressed in pixels).
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aRenderer SetBackground 1 1 1
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renWin SetSize 640 480
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# Note that when camera movement occurs (as it does in the Dolly()
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# method), the clipping planes often need adjusting. Clipping planes
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# consist of two planes: near and far along the view direction. The
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# near plane clips out objects in front of the plane the far plane
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# clips out objects behind the plane. This way only what is drawn
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# between the planes is actually rendered.
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aRenderer ResetCameraClippingRange
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# Set up a callback (using command/observer) to bring up the Tcl
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# command GUI when the keypress-u (UserEvent) key is pressed.
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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# Interact with data. The Tcl/Tk event loop is started automatically.
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iren Initialize
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wm withdraw .
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