[vtkusers] How should I get the right normal of a polygon defined in vtkCellArray?

[michal you]

Thanks,Amy.
But after I do as you suggested,how should I access the normal of each 
polygon mannually?I want to read out the polygon information and write into 
other file formats.But vtkCellArray doesn't seem to provide such method to 
get the normal of a polygon ,it just offer the vertex infomation.
Thanks again.


>From: Amy Squillacote <amy.squillacote at kitware.com>
>To: "michal you" <higherone at msn.com>, vtkusers at vtk.org
>CC: vtkusers-request at vtk.org
>Subject: Re: [vtkusers] How should I get the right normal of a polygon  
>defined in vtkCellArray?
>Date: Thu, 29 Sep 2005 08:33:50 -0400
>
>Have you tried using the vtkPolyDataNormals filter with ComputeCellNormals 
>turned on and ComputePointNormals turned off?
>
>- Amy
>
>At 08:00 AM 9/29/2005, michal you wrote:
>>I must distinguish which side of the polygon is the inner side or outer 
>>side?Is there any way I can do this?Thanks for any suggestions.
>>
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