Hello, I want to compute streamlines in deal.II after solving a velocity potential equation, so I need to get velocity (gradient of solution) on the point to take the streamline a step forward. Unfortunately, each streamline consists around 2000 points which means it should call `VectorTools::point_gradient` 2000 times. It takes too much time. I search the document but find VectorTools::point_gradient only support searching the point belong to which cell globally. I think it can be optimized, because if I have got previous point, next point should locate in the same cell or neighbor cells. My question is: Is any ready-made function of `point_gradient` in deal.II supporting searching the specified point's owner cell only around given cells not globally? Thanks for your reply in advance.
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