John,
I commonly have unstructured finite element meshes that have been
described to ParaView via an EnSight format as distinct 'Parts'
based on material type. In deed, the isosurfaces have
discontinuities, In my case, the discontinuities are desirable.
However, one can use PV's Merge Blocks filter to join a set of
Blocks/Parts into a single Block/Part, and then construct the
desired isosurfaces. The discontinuities should then be smoothed
out.
Hope this helps.
Sam
On 9/20/2015 10:27 PM, John Moore
wrote:
It appears I have run into an issue with generating
isosurfaces from Hex elements. I am visualizing high order
data, which is discontinuous at the element interfaces,
but continuous within each of the subdivisions used to
visualize the element.
If I create a volumetric isosurface I often get large
discontinuities. However, If I create a slice of the
volumetric data and then take an isosurface of the slice,
I obtain isolines without large discontinuities. When I
visualize the isolines and isosurfaces simultaneously,
they do not intersect as they should. It seems very odd
that taking a slice and then taking the isosurface of the
slice produces the correct result, while taking the
volumetric isosurface does not.
I think the issue stems from the fact that the isosurfaces
for Hexes are generated by the marching cubes algorithm,
which can fail if there are trilinear terms. I've
implemented my own isosurface generation algorithm, with the
same results. I assume some kind of fix has been implemented
for the slice feature or isosurface algorithm in 2D. Can
anyone confirm this? And if so, is there a plan to implement
a more robust Hex isosurface algorithm? Or perhaps I'm on
the wrong track here...
Thank you for looking,
John
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