[Paraview] How to extract the boundary of an unstructured grid?

[Stephen Wornom]

Cory Quammen wrote:
> The Extract Surface filter in ParaView is probably what you want.
>    
What I do is to create a new variable "Bnd" that is zero at interior 
points and non-zero value(s) on the interfaces.
Then
Extract Surface
Threshold (choose Bnd and the value of the interface)
This works for me (cylinder, sphere surfaces, ...etc)
Hope this helps,
Stephen
> - Cory
>
> On Tue, Nov 15, 2011 at 4:06 PM, Fred Fred<stan1313 at hotmail.fr>  wrote:
>    
>> Is there a filter - typically inherited from
>> vtkUnstructuredGridToPolyDataFilter but I did not see any - to extract the
>> boundary of an unstructured grid as a polydata set?
>> Same question for a structured grid BTW.
>>
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stephen.wornom at inria.fr
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