#ifndef CATMULL_CLARK_H
#define CATMULL_CLARK_H
#include <Eigen/Core>

// Conduct num_iters iterations of Catmull-Clark subdivision on a **pure quad**
// mesh (V,F).
//
// Inputs:
//   V  #V by 3 list of vertex positions
//   F  #F by 4 list of quad mesh indices into V
//   num_iters  number of iterations
// Outputs:
//   SV  #SV by 3 list of vertex positions
//   SF  #SF by 4 list of quad mesh indices into SV
// 
void catmull_clark(
  const Eigen::MatrixXd & V,
  const Eigen::MatrixXi & F,
  const int num_iters,
  Eigen::MatrixXd & SV,
  Eigen::MatrixXi & SF);
#endif