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
|
#!/usr/bin/env python
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
cone = vtk.vtkConeSource()
cone.SetHeight(3.0)
cone.SetRadius(1.0)
cone.SetResolution(10)
coneMapper = vtk.vtkPolyDataMapper()
coneMapper.SetInputConnection(cone.GetOutputPort())
# Actor for opacity as a property value.
coneActor = vtk.vtkActor()
coneActor.SetMapper(coneMapper)
coneActor.GetProperty().SetOpacity(0.5)
# Actor for opacity through LUT.
elevation = vtk.vtkElevationFilter()
elevation.SetInputConnection(cone.GetOutputPort())
coneMapper2 = vtk.vtkPolyDataMapper()
coneMapper2.SetInputConnection(elevation.GetOutputPort())
lut = vtk.vtkLookupTable()
lut.SetAlphaRange(0.9, 0.1)
lut.SetHueRange(0, 0)
lut.SetSaturationRange(1, 1)
lut.SetValueRange(1, 1)
coneMapper2.SetLookupTable(lut)
coneMapper2.SetScalarModeToUsePointData()
coneMapper2.SetScalarVisibility(1)
coneMapper2.InterpolateScalarsBeforeMappingOn()
coneActorLUT = vtk.vtkActor()
coneActorLUT.SetMapper(coneMapper2)
coneActorLUT.SetPosition(0.1, 1.0, 0)
coneActorLUT.GetProperty().SetOpacity(0.99)
# Actor for opacity through texture.
reader = vtk.vtkPNGReader()
reader.SetFileName(VTK_DATA_ROOT + "/Data/alphachannel.png")
reader.Update()
sphere = vtk.vtkTexturedSphereSource()
texture = vtk.vtkTexture()
texture.SetInputConnection(reader.GetOutputPort())
coneMapper3 = vtk.vtkPolyDataMapper()
coneMapper3.SetInputConnection(sphere.GetOutputPort())
coneActorTexture = vtk.vtkActor()
coneActorTexture.SetTexture(texture)
coneActorTexture.SetMapper(coneMapper3)
coneActorTexture.SetPosition(0, -1.0, 0)
coneActorTexture.GetProperty().SetColor(0.5, 0.5, 1)
coneActorTexture.GetProperty().SetOpacity(0.99)
ren1 = vtk.vtkRenderer()
ren1.AddActor(coneActor)
ren1.AddActor(coneActorLUT)
ren1.AddActor(coneActorTexture)
ren1.SetBackground(0.1, 0.2, 0.4)
ren1.SetUseDepthPeeling(1)
# 20 layers of translucency
ren1.SetMaximumNumberOfPeels(20)
# 2 out of 1000 pixels
ren1.SetOcclusionRatio(0.002)
renWin = vtk.vtkRenderWindow()
renWin.SetMultiSamples(0)
renWin.SetAlphaBitPlanes(1)
renWin.AddRenderer(ren1)
renWin.SetSize(300, 300)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
style = vtk.vtkInteractorStyleTrackballCamera()
iren.SetInteractorStyle(style)
iren.Initialize()
camera = ren1.GetActiveCamera()
camera.SetPosition(9, -1, 3)
camera.SetViewAngle(30)
camera.SetViewUp(0.05, 0.96, 0.24)
camera.SetFocalPoint(0, 0.25, 0)
ren1.ResetCameraClippingRange()
renWin.Render()
print(ren1.GetLastRenderingUsedDepthPeeling())
if (ren1.GetLastRenderingUsedDepthPeeling()):
print("depth peeling was used")
else:
print("depth peeling was not used (alpha blending instead)")
#iren.Start()
|
