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#!/usr/bin/env python
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
#
# Do picking with an actor with a texture.
# This example draws a cone at the pick point, with the color
# of the cone set from the color of the texture at the pick position.
#
# renderer and interactor
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# read the volume
reader = vtk.vtkJPEGReader()
reader.SetFileName(VTK_DATA_ROOT + "/Data/beach.jpg")
#---------------------------------------------------------
# Do the surface rendering
sphereSource = vtk.vtkSphereSource()
sphereSource.SetRadius(100)
textureSphere = vtk.vtkTextureMapToSphere()
textureSphere.SetInputConnection(sphereSource.GetOutputPort())
sphereStripper = vtk.vtkStripper()
sphereStripper.SetInputConnection(textureSphere.GetOutputPort())
sphereStripper.SetMaximumLength(5)
sphereMapper = vtk.vtkPolyDataMapper()
sphereMapper.SetInputConnection(sphereStripper.GetOutputPort())
sphereMapper.ScalarVisibilityOff()
sphereTexture = vtk.vtkTexture()
sphereTexture.SetInputConnection(reader.GetOutputPort())
sphereProperty = vtk.vtkProperty()
sphereProperty.BackfaceCullingOn()
sphere = vtk.vtkActor()
sphere.SetMapper(sphereMapper)
sphere.SetTexture(sphereTexture)
sphere.SetProperty(sphereProperty)
#---------------------------------------------------------
ren.AddViewProp(sphere)
camera = ren.GetActiveCamera()
camera.SetFocalPoint(0, 0, 0)
camera.SetPosition(100, 400, -100)
camera.SetViewUp(0, 0, -1)
ren.ResetCameraClippingRange()
renWin.Render()
#---------------------------------------------------------
# the cone should point along the Z axis
coneSource = vtk.vtkConeSource()
coneSource.CappingOn()
coneSource.SetHeight(12)
coneSource.SetRadius(5)
coneSource.SetResolution(31)
coneSource.SetCenter(6, 0, 0)
coneSource.SetDirection(-1, 0, 0)
#---------------------------------------------------------
picker = vtk.vtkCellPicker()
picker.SetTolerance(1e-6)
picker.PickTextureDataOn()
# A function to point an actor along a vector n = (nx,ny.nz)
def PointCone(actor, n):
if n[0] < 0.0:
actor.RotateWXYZ(180, 0, 1, 0)
actor.RotateWXYZ(180, (n[0] - 1.0) * 0.5, n[1] * 0.5, n[2] * 0.5)
else:
actor.RotateWXYZ(180, (n[0] + 1.0) * 0.5, n[1] * 0.5, n[2] * 0.5)
# Pick the actor
picker.Pick(104, 154, 0, ren)
#print picker
p = picker.GetPickPosition()
n = picker.GetPickNormal()
ijk = picker.GetPointIJK()
data = picker.GetDataSet()
i = ijk[0]
j = ijk[1]
k = ijk[2]
if data.IsA("vtkImageData"):
r = data.GetScalarComponentAsDouble(i, j, k, 0)
g = data.GetScalarComponentAsDouble(i, j, k, 1)
b = data.GetScalarComponentAsDouble(i, j, k, 2)
else:
r = 255.0
g = 0.0
b = 0.0
r = r / 255.0
g = g / 255.0
b = b / 255.0
coneActor1 = vtk.vtkActor()
coneActor1.PickableOff()
coneMapper1 = vtk.vtkDataSetMapper()
coneMapper1.SetInputConnection(coneSource.GetOutputPort())
coneActor1.SetMapper(coneMapper1)
coneActor1.GetProperty().SetColor(r, g, b)
coneActor1.GetProperty().BackfaceCullingOn()
coneActor1.SetPosition(p)
PointCone(coneActor1, n)
ren.AddViewProp(coneActor1)
ren.ResetCameraClippingRange()
renWin.Render()
#---------------------------------------------------------
# test-related code
def TkCheckAbort (__vtk__temp0=0, __vtk__temp1=0):
foo = renWin.GetEventPending()
if (foo != 0):
renWin.SetAbortRender(1)
pass
renWin.AddObserver("AbortCheckEvent", TkCheckAbort)
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