vtkBinnedDecimation is a high-performance, threaded algorithm for
reducing the number of triangles in a mesh. It is similar to
vtkQuadricClustering but typically 10-50x faster.

The initial implementation used the input points as the output
points. This had negative impact on the rendering system as
larger than necessary VBOs could be created. This new implementation
creates new points, and discards points that are not used. Also,
performance improvements were made in the form of four different
algorithms.