Franco you cannot slice or isosurface a dataset made of poly-vertices, because there is no 3D cell.
your best bet would be to use the Point Interpolation filters (standard points , or SPH points). However, these filters require at least one scalar array attached to the points. Your data only contains a vector-valued array. If you decompose the vector into its 3 components, you would be able to use the Point Interpolators. ----------------- Jean/CSCS
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