Add Select by source

Please add the ability to select all cells that are intersected by a source, or points (near) a source. An example is a line. If I have a line source in a pipe, with fluid flowing through the pipe, I may want to select all of the cells that touch the line, or points that are near the line. I want the same thing for a Spline or Plane Source. Although this may be strange, maybe a filter that has two inputs?

This must be traceable, and work with Python.

This is for Watney.