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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#!/usr/bin/env python
import vtk
from vtk.test import Testing
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Interpolate onto a volume
# Parameters for debugging
NPts = 1000000
math = vtk.vtkMath()
math.RandomSeed(31415)
# create pipeline
#
points = vtk.vtkBoundedPointSource()
points.SetNumberOfPoints(NPts)
points.SetBounds(-3,3, -1,1, -1,1)
points.ProduceRandomScalarsOn()
points.ProduceCellOutputOff()
points.Update()
# Create a cylinder
cyl = vtk.vtkCylinder()
cyl.SetCenter(-2,0,0)
cyl.SetRadius(0.02)
# Create a (thin) box implicit function
box = vtk.vtkBox()
box.SetBounds(-1,0.5, -0.5,0.5, -0.0005, 0.0005)
# Create a sphere implicit function
sphere = vtk.vtkSphere()
sphere.SetCenter(2,0,0)
sphere.SetRadius(0.8)
# Boolean (union) these together
imp = vtk.vtkImplicitBoolean()
imp.SetOperationTypeToUnion()
imp.AddFunction(cyl)
imp.AddFunction(box)
imp.AddFunction(sphere)
# Extract points along sphere surface
extract = vtk.vtkFitImplicitFunction()
extract.SetInputConnection(points.GetOutputPort())
extract.SetImplicitFunction(imp)
extract.SetThreshold(0.0005)
extract.Update()
# Now generate normals from resulting points
curv = vtk.vtkPCACurvatureEstimation()
curv.SetInputConnection(extract.GetOutputPort())
curv.SetSampleSize(6)
# Time execution
timer = vtk.vtkTimerLog()
timer.StartTimer()
curv.Update()
timer.StopTimer()
time = timer.GetElapsedTime()
print("Points processed: {0}".format(NPts))
print(" Time to generate curvature: {0}".format(time))
# Break out the curvature into thress separate arrays
assign = vtk.vtkAssignAttribute()
assign.SetInputConnection(curv.GetOutputPort())
assign.Assign("PCACurvature", "VECTORS", "POINT_DATA")
extract = vtk.vtkExtractVectorComponents()
extract.SetInputConnection(assign.GetOutputPort())
extract.Update()
print(extract.GetOutput(0).GetScalarRange())
print(extract.GetOutput(1).GetScalarRange())
print(extract.GetOutput(2).GetScalarRange())
# Three different outputs for different curvatures
subMapper = vtk.vtkPointGaussianMapper()
subMapper.SetInputConnection(extract.GetOutputPort(0))
subMapper.EmissiveOff()
subMapper.SetScaleFactor(0.0)
subActor = vtk.vtkActor()
subActor.SetMapper(subMapper)
subActor.AddPosition(0,2.25,0)
sub1Mapper = vtk.vtkPointGaussianMapper()
sub1Mapper.SetInputConnection(extract.GetOutputPort(1))
sub1Mapper.EmissiveOff()
sub1Mapper.SetScaleFactor(0.0)
sub1Actor = vtk.vtkActor()
sub1Actor.SetMapper(sub1Mapper)
sub2Mapper = vtk.vtkPointGaussianMapper()
sub2Mapper.SetInputConnection(extract.GetOutputPort(2))
sub2Mapper.EmissiveOff()
sub2Mapper.SetScaleFactor(0.0)
sub2Actor = vtk.vtkActor()
sub2Actor.SetMapper(sub2Mapper)
sub2Actor.AddPosition(0,-2.25,0)
# Create the RenderWindow, Renderer and both Actors
#
ren0 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren0)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
#
ren0.AddActor(subActor)
ren0.AddActor(sub1Actor)
ren0.AddActor(sub2Actor)
ren0.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(250,250)
cam = ren0.GetActiveCamera()
cam.SetFocalPoint(0,0,-1)
cam.SetPosition(0,0,0)
ren0.ResetCamera()
iren.Initialize()
# render the image
#
renWin.Render()
#iren.Start()
|
