vtk-m/docs/changelog/cell_locator_changes.md

Updating structured cell locators

VTK-m will mow allow locating containing cells for a point using CellLocatorUniformGrid and CellLocatorRectilinearGrid for 2D grids.

Users are required to create the locator objects as they normally would. However, the FindCell method in vtkm::exec::CellLocator still requires users to pass a 3D point as an input.

Further, the structured grid locators no longer use the vtkm::exec::WorldToParametricCoordinates method to return parametric coordinates, instead they use fast paths for locating points in a cell of an axis-aligned grid.

Another change for the CellLocatorRectilinearGrid is that now it uses binary search on individual component arrays to search for a point.