Hi, I have paraview 3.14 with 64-bit Win7. I have an ensight file with about 5 million points. I used GradientOfUnstructuredDataSet to calculate the gradient, and use the gradient to calculate the Q-value for vortex detection (the Q-criterion).
(1) The selected points does not support any evidence of vortex. Does anyone know how the GradientOfUnstructuredDataSet filter work? (2) I also compute the vorticity (this option is under GradientOfUnstructuredDataSet filter) but I did not find any resulted variable in the list. I was thinking using it to do vortex detection. Can anyone tell me where to find this variable? (3) The result of stream trace filter is noting (cell/point number is 0) as I think it is due to the lack of gird connectivity. I tried GridConnecivity filter to make the connection but I failed. The vtkErrorMessage: “Missing pedigree node array.”, “This filter cannot handle sub-datasets of type: vtkUnstructuredGrid. Skipping block.”, and “ExecuteProcess: Unknown input ScalarType.” Can anyone tell me what does the pedigree node mean and how can I get streamline with the unstructured grid? Tons of thank! Best, Mei Chen
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