Hello, Having looked at the docs and explored the UI, I can't tell whether Paraview can do what I want. I have some scalar field data on a regular grid. I import that into Paraview and then use the Gradient filter to calculate the gradient of this data. Now what I want to do is query both of these data sets and plot the scalar field data only if it falls within a certain range of values AND its gradient also falls within a certain range. I can imagine doing this either by writing a filter to create a third data set which contains only those points which pass the test, but neither the Calculator nor the Custom Filter seem to let me do that. Or I could create the plot more directly by creating a multivariate transfer function, but I can't find any way to do that in the UI. Can Paraview do this kind of thing from within the UI?
Eventually I will want to add the Laplacian and be able to query all 3 field properties in order to determine what to plot, but for now I thought I would work on the simpler 2-variable case. Dale
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