[Paraview] Fwd: grain boundaries contour line

[Rovinelli, Andrea]

Does anyone has any idea on how to implement line that represent different zone inside a material like grain boundaries??

i have a 3d rectilinear grid, and at each point i have the grain id, and the vonmises stress, i wouldlike to superimpose grain boundaries to the vonmises stress.
i have already tried contour filter of a refined grid with values 0  and 1 for respectively not grain boundaries and grain boundaries  but doesn't work for this purpose.
the other thing that i tried is delaunay 3d but i can't find a way to tell to paraview of triangulate the grains id

an example of what i would like to obtain is in this image
[cid:FE68DC38-3514-40E1-AC69-5A8CD0B8801B at Belkin]
Sincerely
Andrea

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