Add the line controls to the Spline Source
Turns out the spline source is a very powerful tool to extract variable data in a dataset along a curved line. The interface sucks. Please update it to match the controls used by Plot Over Line.
- We want the starting end to be a ball, other end to be an arrow.
- Allow "p" to place the hightlighted control point on the surface of an object. Allow "1" and "2" to place the starting point and ending point.
- Keep the spline source visible if you are clicking on other filters.
Here is a use case. Use it with disk_out_ref.exo. https://discourse.paraview.org/t/extract-data-from-a-volume-along-an-elliptical-line/723