1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
package require vtk
package require vtkinteraction
package require vtktesting
#
# Demonstrate the use of clipping and capping on polyhedral data. Also shows how to
# use triangle filter to triangulate loops.
#
# create pipeline
#
# Read the polygonal data and generate vertex normals
vtkBYUReader cow
cow SetGeometryFileName "$VTK_DATA_ROOT/Data/Viewpoint/cow.g"
vtkPolyDataNormals cowNormals
cowNormals SetInputConnection [cow GetOutputPort]
# Define a clip plane to clip the cow in half
vtkPlane plane
plane SetOrigin 0.25 0 0
plane SetNormal -1 -1 0
vtkClipPolyData clipper
clipper SetInputConnection [cowNormals GetOutputPort]
clipper SetClipFunction plane
clipper GenerateClipScalarsOn
clipper GenerateClippedOutputOn
clipper SetValue 0.5
vtkPolyDataMapper clipMapper
clipMapper SetInputConnection [clipper GetOutputPort]
clipMapper ScalarVisibilityOff
vtkProperty backProp
eval backProp SetDiffuseColor $tomato
vtkActor clipActor
clipActor SetMapper clipMapper
eval [clipActor GetProperty] SetColor $peacock
clipActor SetBackfaceProperty backProp
# Create polygons outlining clipped areas and triangulate them to generate cut surface
vtkCutter cutEdges; #Generate cut lines
cutEdges SetInputConnection [cowNormals GetOutputPort]
cutEdges SetCutFunction plane
cutEdges GenerateCutScalarsOn
cutEdges SetValue 0 0.5
vtkStripper cutStrips; #Forms loops (closed polylines) from cutter
cutStrips SetInputConnection [cutEdges GetOutputPort]
cutStrips Update
vtkPolyData cutPoly; #This trick defines polygons as polyline loop
cutPoly SetPoints [[cutStrips GetOutput] GetPoints]
cutPoly SetPolys [[cutStrips GetOutput] GetLines]
vtkTriangleFilter cutTriangles; #Triangulates the polygons to create cut surface
cutTriangles SetInput cutPoly
vtkPolyDataMapper cutMapper
cutMapper SetInput cutPoly
cutMapper SetInputConnection [cutTriangles GetOutputPort]
vtkActor cutActor
cutActor SetMapper cutMapper
eval [cutActor GetProperty] SetColor $peacock
# Create the rest of the cow in wireframe
vtkPolyDataMapper restMapper
restMapper SetInput [clipper GetClippedOutput]
restMapper ScalarVisibilityOff
vtkActor restActor
restActor SetMapper restMapper
[restActor GetProperty] SetRepresentationToWireframe
# Create graphics stuff
#
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 clipActor
ren1 AddActor cutActor
ren1 AddActor restActor
ren1 SetBackground 1 1 1
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 30
[ren1 GetActiveCamera] Elevation 30
[ren1 GetActiveCamera] Dolly 1.5
ren1 ResetCameraClippingRange
renWin SetSize 300 300
iren Initialize
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up then start the event loop
wm withdraw .
# Lets you move the cut plane back and forth
proc Cut {v} {
clipper SetValue $v
cutEdges SetValue 0 $v
cutStrips Update
cutPoly SetPoints [[cutStrips GetOutput] GetPoints]
cutPoly SetPolys [[cutStrips GetOutput] GetLines]
cutMapper Update
renWin Render
}
|
