[vtkusers] Rendering Quadratic Elements

[furlanis at ele.uri.edu]

vtk people,
I'm rendering quadratic unstructured grids, and they do not appear as they do in
the user guide, or the text book. The books show the quadratic elements as
having interpolated edges, but when i render them they are drawn with straight
edges. I am putting together a graphics package for my project team so we can
view their results. They are working on finite element analysis, and are
rendering some heart models. The text book describes the quadratic quadrilateral
as being comprised of 4 quads, yet when i run your exampls and my own program,
it appears to be made out of triangles against the corners, and the middle
'area' is divided into triangles as well.
am i not passing the non-linear elements through the right filters? i want the
data to look smooth, but even when i make a quadratic edge, it is still just
straight lines.

please let me know how i can fix this problem, or if there even is a fix for it.

-Stephen Furlani
-URI