[vtkusers] How to get boundary points???

[david e ignacio]

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!
>