Hello,
I would like to select a subset of points from a preexisting VTK data structure, and then use a ruler to compute distances between point pairs.

For example, from a given data set, I can first identify all cells between a temperature range 300 - 600 K using Threshold. Then I can use the CellCenters filter to plot all the centers of these points. These cell centers then appear on screen using the ‘Point Gaussian’ representation.

I would like to go further and select a subset of these visible cell centers, and compute distances between them.

Looking online, I saw older emails about a Selection Editor which was used to select cell centers, however, I understand that the Selection Editor was later removed. I havent been able to find anything else that can help me select points of my choosing.

The problem I am having is that there seems to be no way of selecting any point from the cloud of points that are rendered by the CellCenters filter. Once I can select the points I want distances between, the Ruler can indeed be used to find the distances.