[vtkusers] Surface from rough grid

[Kenneth Porter]

I've got points collected from a physical system that are nominally on a 
rectangular grid, but with some distortion off the nominal grid due to the 
physical nature of the data collection. There may be missing points. (The 
data is of a disk, so there won't be "corners" on the grid.) I'd like to 
display the result color-coded by height, and I found an example for that 
here:

<http://www.vtk.org/Wiki/VTK_Examples_Color_a_mesh_by_height>

Is there a straightforward way to take my grid of points and convert them 
to a mesh for this?