[vtkusers] How to get boundary points???

[Jeff Lee]

vtkFeatureEdges will give you the boundaryEdges.  I think if you grab 
the output of that filter, it will have the cells (lines) and points you 
require.
-Jeff

david e ignacio wrote:

> I don't know if there is a prebuilt class that does this.  If you want 
> to implement this yourself, you can look up such things as "Graham's 
> Scan" and also Jarvis's March.  They are fairly simple algorithms that 
> run in O(nlogn) and O(nh) where h is the number of points in the hull.
> Let me know if you need more help than that.  If I ever get some free 
> time from my schoolwork and this is still needed, I can put something 
> together.
>
> Let me know
> Dave
>
> Larry wrote:
>
>> Hello, everyone!
>> I have a vtkPolyData, which is in my case actually a bunch of triangle
>> cells lie on the same plane, now I want to get the boundary that 
>> enclose all
>> the triangles.
>> Simply to say, that I have some points, and I'd like to figure out 
>> the boundary points.
>>
>> Is there any way in vtk to do that?
>>
>> Thanks!
>>  
>
>
>
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