Have you ever wanted to slice a dataset along a curve such as a spline or the streamline output by ParaView's Stream Tracer filter? The slice filter only allows a plane, sphere and box as the surface to slice. The Slice Along Polyline filter just added to ParaView's development branch allows slicing along a non-intersecting curve.
The resulting surface from this filter is the surface cut if a laser was run along the curve while being kept parallel to the z-axis. Here is an example of slicing a Wavelet source along a Spline: