嗨,提前谢谢你抽出时间。在
我目前正在创建一个软件包,它将允许用户可视化导入的数据。我当前使用的数据是一个.txt文件,其尺寸为120列乘24320行。我正在导入并转换为尺寸为120x128x190的三维网格。然后我将这些数据与阈值进行比较,并将值1分配给值大于阈值的任何单元格。这一切都很好,我甚至手动检查了数据保存和交叉检查它与txt文件,它是正确的,但是我不能让可视化工作正常,而不是输出一个心形,它给出了一个非常规则的网格状图案(见http://img855.imageshack.us/img855/4944/vtk.png)。我真的拼命想让这个工作,所以任何帮助将不胜感激。我当前使用的代码是:
import vtk
from vtk.util import vtkImageImportFromArray
from numpy import *
#intensity threshold 900000
# import the data
# read files
intensityI=[]
print("Reading files...")
in_file = open("intensity.txt", "rt")
for line in in_file.readlines():
intensityI.append([])
for i in line.split():
intensityI[-1].append(float(i))
in_file.close()
print("...done")
#set parameters specific to data
nx = 119
ny = 127
nz = 189
sizex=nx+1
sizey=ny+1
sizez=nz+1
threshold = 900000
#convert to array
I = zeros((sizez, sizex, sizey))
It = zeros((sizez, sizex, sizey), dtype=uint8)
print("converting to 3D array...")
z=0
while z<sizez:
x=0
while x<sizex:
y=0
while y<sizey:
I[z][x][y] = int(intensityI[(z*128)+y][x])
#print(I[z][x][y])
#print(int(intensityI[(z*128)+y][x]))
if I[z][x][y] > threshold:
It[z][x][y] = 1
y += 1
x += 1
z += 1
print("...done")
print("converting to string...")
# I now contains raw intensity information
# It contains thesholded intensity
dataImporter = vtk.vtkImageImport()
data_string = It.tostring()
dataImporter.CopyImportVoidPointer(data_string, len(data_string))
dataImporter.SetDataScalarTypeToUnsignedChar()
dataImporter.SetNumberOfScalarComponents(1)
dataImporter.SetDataExtent(0, nz, 0, ny, 0, nx)
dataImporter.SetWholeExtent(0, nz, 0, ny, 0, nx)
print("...done")
print("drawing...")
alphaChannelFunc = vtk.vtkPiecewiseFunction()
alphaChannelFunc.AddPoint(1, 0.05)
alphaChannelFunc.AddPoint(0, 0.0)
colorFunc = vtk.vtkColorTransferFunction()
colorFunc.AddRGBPoint(1, 1.0, 0.0, 0.0)
#colorFunc.AddRGBPoint(0, 0.0, 1.0, 0.0)
volumeProperty = vtk.vtkVolumeProperty()
volumeProperty.SetColor(colorFunc)
volumeProperty.SetScalarOpacity(alphaChannelFunc)
compositeFunction = vtk.vtkVolumeRayCastCompositeFunction()
volumeMapper = vtk.vtkVolumeRayCastMapper()
volumeMapper.SetVolumeRayCastFunction(compositeFunction)
volumeMapper.SetInputConnection(dataImporter.GetOutputPort())
volume = vtk.vtkVolume()
volume.SetMapper(volumeMapper)
volume.SetProperty(volumeProperty)
renderer = vtk.vtkRenderer()
renderWin = vtk.vtkRenderWindow()
renderWin.AddRenderer(renderer)
renderInteractor = vtk.vtkRenderWindowInteractor()
renderInteractor.SetRenderWindow(renderWin)
renderer.AddVolume(volume)
renderer.SetBackground(0,0,0)
renderWin.SetSize(400, 400)
def exitCheck(obj, event):
if obj.GetEventPending() != 0:
obj.SetAbortRender(1)
renderWin.AddObserver("AbortCheckEvent", exitCheck)
renderInteractor.Initialize()
renderWin.Render()
renderInteractor.Start()
print("...done")
我假设这个问题是由于我使用numpy数组引起的,所以我尝试使用vtkStructuredPoints,但是如果我试图将1写入vtkStructuredPoints数组,则会出现以下错误:TypeError:'vtkobject'对象在It[z][x][y] = 1
行上不可订阅,因此我不确定该错误消息意味着什么。在
我用来创建vtkStructuredPoints数组的代码是
^{pr2}$非常感谢您提供的任何帮助或建议。在
约翰
目前没有回答
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