[vtkusers] what kind input data does vtkstreamline need?

[Amy Squillacote]

Hi Zhao,

The output type of vtkMarchingCubes is vtkPolyData, which is not generally 
used in generating stream lines.  Try generating streamlines from the data 
you use as the input to marching cubes.

- Amy

At 11:42 AM 5/17/2005, Zhao Yongqiang wrote:
>Will,
>
>Thank you for your reply. I check the mailing list and the document of 
>VTK, but i can not find how to associate the isosurface data with the 
>vector field. So, my question is :
>How to build vector field to represent blood flow and how to associate?
>Can I build the field from the isosurface data? and can I use the 
>isosurface data as source object of vtkStreamline?
>
>Zhao Yongqiang
>2005.5.17
>
>Will Schroeder wrote:
>
>>Zhao-
>>
>>Streamlines need a vector field (which in your case should be a 
>>representation of blood flow). That is, the volume that you isocontoured 
>>should have vectors associated with it, and should be the input to the 
>>streamline filter. Then of course you'll want to specify a starting point 
>>or points for the streamline.
>>
>>Will
>>
>>At 11:05 AM 5/16/2005, Zhao Yongqiang wrote:
>>
>>>Hi all,
>>>       After i get the segmented data, i use marching cube to visualize 
>>> the blood vessel. Then,  I want to use vtkstreamline to simulate blood 
>>> flow. But when i use the output of the marching cube as the input of 
>>> vtkstreamline , it said that "No vector data defined!".
>>>      Can someone tell me the reason? and how to solve it?
>>>      Thanks in advance!
>>>
>>>
>>>Zhao Yongqiang
>>>2005.5.16
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>>
>>
>
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