This is a general framework to interpolate attributes from a data source,
using the input as the set of interpolation points. It requires
specifying an interpolation kernel (several of which have been
created), as well as a locator for fast spatial searching. Although
similar in concept to vtkProbeFilter, it does not interpolate
using a cells interpolation basis, rather it uses a local evaluation
of the specified kernel, applied to the local points (neighborhood)
around each interpolation point, to compute the interpolated data values.
The algorithm is threaded with vtkSMPTools.