message: Description of the miniapp.
diff: -// MFEM Distance Function Solver - Parallel Version
  +// Copyright (c) 2010-2021, Lawrence Livermore National Security, LLC. Produced
  +// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
  +// LICENSE and NOTICE for details. LLNL-CODE-806117.
  +//
  +// This file is part of the MFEM library. For more information and source code
  +// availability visit https://mfem.org.
  +//
  +// MFEM is free software; you can redistribute it and/or modify it under the
  +// terms of the BSD-3 license. We welcome feedback and contributions, see file
  +// CONTRIBUTING.md for details.
  +//
  +// -------------------------------------------------
  +// Distance Miniapp: Finite element distance solver
  +// -------------------------------------------------
  +//
  +// This miniapp computes the shortest distance to a given point source or to the
  +// zero level set of a given function. The input can be a DeltaCoefficient (for
  +// a point source), or any Coefficient (for the case of a level set). The
  +// output is a GridFunction that can be scalar (representing the scalar
  +// distance), or a vector (its magnitude is the distance, and its direction is
  +// the starting direction of the shortest path). The miniapp support 2 solvers:
  +//
  +// 1. Heat solver:
  +// Crane, Weischedel, Weischedel
  +// Geodesics in Heat: A New Approach to Computing Distance Based on Heat Flow
  +// ACM Transactions on Graphics, Vol. 32, No. 5, October, 2013
  +// 2. p-Laplacian solver:
  +// Belyaev, Fayolle
  +// On Variational and PDE-based Distance Function Approximations, Section 7.
  +// Computational Mathematics and Mathematical Physics 59, 2019
  //
  // Compile with: make distance
  //
  