[vtkusers] error in using vtkCellLocator::IntersectWithLine

[xujf]

>xujf wrote:
>> Hi,vtkusers:
>>    I get an isosurface using vtkImageMarchingCubes,and I get a line using >vtklinesource.
>> I want to get the point of intersection of the isosurface and the line.In order to get
>> the point of intersection,I use vtkCellLocator::IntersectWithLine.But error is found:
>> AttributeError:IntersectWithLine.
>> 
>> this is my programe:(written in python)
>> 
>> import sys,os 
>> from paths import *
>> from vtkMINCReader import *
>>
>> reader=vtkMINCReader()
>> reader.SetFileName("E:/picture/brain.mnc")
>>
>> filter=vtkImageMarchingCubes()
>> filter.SetInput(reader.GetOutput())
>> filter.SetValue(0,1200)
>> 
>> tolerance=100.0

>xujf,

>	Just after tolerance add:
>
>filter.Update()
>print filter.GetOutput().GetNumberOfCells()
>
>If it is equal to zero you won\'t be able to go any furhter.

>Mathieu

Hi,Mathieu:
   Thanks very much for your help.
   I add these two sentences in my programe: 
filter.Update()
print filter.GetOutput().GetNumberOfCells()

the result is 1839638.it is not zero.
still the sentence in my programe"returnState=myCellLocator.IntersectWithLine(center,point,tolerance,t,intersectionPoint,parametricCoords,subCellID,cellID)"
has an error:
AttributeError :IntersectWithLine

Best Regards!