[vtkusers] How to plot polygon on the sphere

[Jim Peterson]

David Doria wrote:
> On Sat, Dec 18, 2010 at 1:55 AM, DONG Li <dongli at lasg.iap.ac.cn> wrote:
>   
>> Dear all,
>>
>> I have calculated the Delaunay triangulation and Voronoi diagram of some data points on the SPHERE. How do I plot them on the sphere? The edge should be spherical great-circle. Any idea?
>>
>> Best regards,
>>
>> DONG Li
>>     
Maybe I am missing the lesson we are trying to explore here, but isn't a 
spherical great circle the points on the surface of the sphere that 
intersect with the plane described by the center of the sphere and the 
start and end points and "between" those two points? I think I would 
treat it as a clipping problem more than a spacial analysis.

Hope that helps,
Jim