[vtkusers] weird patches in delaunay triangulation

[Burlen]

Hi, in an attempt to visualize some multi resolution data I'm constructing a 
surface by passing vtkPolyData made from vtkPoints, & a vtkDoubleArray 
through the vtkDelaunay2D filter & then writing the output to file for use 
with paraview. In the resulting visualization I see a bunch of anomalies, 
that look like pentagonal patches in one case and hexagonal in another. the 
following images shows what I'm talking about. There are three visualizations 
shown, the first is that of a vtkUnstructuredGrid obtained from the output of 
vtkAppendFilter(), the second is that of a vtkDelaunay2D filter acting on the 
vtkPoints and arrays from vtkPointData that are in the output of the 
vtkAppendFilter, the third is that of a vtkDelaunay2D acting on a vtkPolyData 
which I built using vtkPoints and vtkDoubleArrays sorted in ascending order 
after removing duplicate points. 

http://quaoar.sr.unh.edu/images/delaunay_splotches.png 

Does any one know what I could do to correct this? Or why it might be 
happening?

-- 

Burlen Loring
Space Science Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire
39 College Road, Durham, NH 03824
Phone: 603-862-1140