[Paraview] Disabling polygon offset (z-fighting prevention) in Paraview

[Olumide]

Hi -

I use Paraview not for visualizing datasets, but for inspecting 
polygonal meshes and the operations I perform on them. My work involves 
computing various points and line segments on meshes, and I use 
VTK/Paraview to see if the points and line segments are where they ought 
to be (if not, I conclude that there's a bug in my code and then proceed 
to hunt it down).

<Digression>
Why I use VTK for this task: VTK is the the only publicly available 3d 
graphics file format I'm aware of that explicitly supports and points, 
lines, and meshes, and has a viewer for viewing these entities. Most 
other 3d graphics file formats either support surfaces alone or have no 
ready-made viewers.
</Digression>

Lately however, upon closer inspection, I've noticed that many of the 
points and line segments that I compute appear to hover above the mesh 
they are computed from and never quite touch it, and points never seem 
to lie on the line segments they are supposed to. For example, see:
http://i17.photobucket.com/albums/b52/videohead/SurfaceError.png
(note that the yellow line segment hover above the blue surface in the 
horizon)

After much experimentation, debugging and consultation, I now suspect 
that this is caused by polygon offset in Paraview, designed to prevent 
z-fighting. I would therefore like to know:

(i.) if my suspicion is correct i.e. Paraview implement polygon offset 
for preventing z-fighting in this case

(ii.) if the above is true, how polygon offset can be disabled without 
recompiling the source

Thanks,

- Olumide