libigl_Martin/include/igl/lim/compute_lim.h

// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2014 Christian Schüller <schuellchr@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_COMPUTE_LIM_H
#define IGL_COMPUTE_LIM_H
#include <igl/igl_inline.h>
#include <Eigen/Core>

namespace igl
{
  // Computes a locally injective mapping of a triangle or tet-mesh based on a deformation energy
  // subject to some provided linear positional constraints Cv-d.
  //
  // Inputs:
  //   vertices          vx3 matrix containing vertex position of the mesh
  //   initialVertices   vx3 matrix containing vertex position of initial rest pose mesh
  //   elements          exd matrix containing vertex indices of all elements
  //   borderVertices    (only needed for 2D LSCM) vector containing indices of border vertices
  //   gradients         (only needed for 2D Poisson) vector containing partial derivatives of target element gradients (structure is: [xx_0, xy_0, xx_1, xy_1, ..., xx_v, xy_v, yx_0, yy_0, yx_1, yy_1, ..., yx_v, yy_v]')
  //   constraintMatrix  C: (c)x(v*(d-1)) sparse linear positional constraint matrix. X an Y-coordinates are alternatingly stacked per row (structure for triangles: [x_1, y_1, x_2, y_2, ..., x_v,y_v])
  //   constraintTargets d: c vector target positions
  //   energyType        type of used energy: 0=Dirichlet,1=Laplacian,2=Green,3=ARAP,4=LSCM
  //   tolerance         max squared positional constraints error
  //   maxIteration      max number of iterations
  //   findLocalMinima   iterating until a local minima is found. If not enabled only tolerance must be fulfilled.
  //   enableOutput      (optional) enables the output (#itaration / hessian correction / step size / positional constraints / barrier constraints / deformation energy) (default : true)
  //   enableAlphaUpdate (optional) enables dynamic alpha weight adjustment (default = true)
  //   beta              (optional) steepness factor of barrier slopes (default: ARAP/LSCM = 0.01, Green = 1)
  //   eps               (optional) smallest valid triangle area (default: 1e-5 * smallest triangle)
  //   
  // where:
  //   v : # vertices
  //   c : # linear constraints
  //   e : # elements of mesh
  //   d : # vertices per element (triangle = 3, tet = 4)
  //----------------------------------------------------------------------------------------
  // Output:
  // vertices          vx3 matrix containing resulting vertex position of the mesh
  //----------------------------------------------------------------------------------------
  // Return values:
  //  1 : Successful optimization with fulfilled tolerance
  // -1 : Max iteration reached before tolerance was fulfilled
  // -2 : not feasible -> has inverted elements (may want to decrease eps?)

  int compute_lim(
    Eigen::Matrix<double,Eigen::Dynamic,3>& vertices,
    const Eigen::Matrix<double,Eigen::Dynamic,3>& initialVertices,
    const Eigen::Matrix<int,Eigen::Dynamic,Eigen::Dynamic>& elements,
    const std::vector<int>& borderVertices,
    const Eigen::Matrix<double,Eigen::Dynamic,1>& gradients,
    const Eigen::SparseMatrix<double>& constraintMatrix,
    const Eigen::Matrix<double,Eigen::Dynamic,1>& constraintTargets,
    int energyType,
    double tolerance,
    int maxIteration,
    bool findLocalMinima);

  int compute_lim(
    Eigen::Matrix<double,Eigen::Dynamic,3>& vertices,
    const Eigen::Matrix<double,Eigen::Dynamic,3>& initialVertices,
    const Eigen::Matrix<int,Eigen::Dynamic,Eigen::Dynamic>& elements,
    const std::vector<int>& borderVertices,
    const Eigen::Matrix<double,Eigen::Dynamic,1>& gradients,
    const Eigen::SparseMatrix<double>& constraintMatrix,
    const Eigen::Matrix<double,Eigen::Dynamic,1>& constraintTargets,
    int energyType,
    double tolerance,
    int maxIteration,
    bool findLocalMinima,
    bool enableOuput,
    bool enableAlphaUpdate,
    double beta,
    double eps);
}

#ifndef IGL_STATIC_LIBRARY
#  include "compute_lim.cpp"
#endif

#endif