CompositeSqrt3T.hh

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//=============================================================================
//
//  CLASS SQRT3T
//
//=============================================================================
 
#ifndef OPENMESH_SUBDIVIDER_UNIFORM_COMPOSITESQRT3T_HH
#define OPENMESH_SUBDIVIDER_UNIFORM_COMPOSITESQRT3T_HH
 
 
//== INCLUDES =================================================================
 
#include "Composite/CompositeT.hh"
#include "Composite/CompositeTraits.hh"
 
 
//== NAMESPACE ================================================================
 
namespace OpenMesh   { // BEGIN_NS_OPENMESH
namespace Subdivider { // BEGIN_NS_DECIMATER
namespace Uniform    { // BEGIN_NS_UNIFORM
 
 
//== CLASS DEFINITION =========================================================
 
template <typename MeshType, typename RealType = double>
class CompositeSqrt3T : public CompositeT<MeshType, RealType>
{
public:
 
   typedef CompositeT<MeshType, RealType> Inherited;
 
public:
 
  CompositeSqrt3T() : Inherited() {};
  explicit CompositeSqrt3T(MeshType& _mesh) : Inherited(_mesh) {};
  ~CompositeSqrt3T() {}
 
public:
   
  const char *name() const override { return "Uniform Composite Sqrt3"; }
 
protected: // inherited interface
 
  void apply_rules(void) override
  {
    Inherited::Tvv3(); 
    Inherited::VF(); 
    Inherited::FF(); 
    Inherited::FVc(coeffs_); 
  }
 
protected:
   
  typedef typename Inherited::Coeff Coeff;
 
  struct FVCoeff : public Coeff 
  {
    FVCoeff() : Coeff() { init(50); }
 
    void init(size_t _max_valence)
    {
      weights_.resize(_max_valence);
      std::generate(weights_.begin(), 
                    weights_.end(), compute_weight() );
    }
    
    double operator()(size_t _valence) override { return weights_[_valence]; }
 
    struct compute_weight 
    {
      compute_weight() : val_(0) { }
 
      double operator()(void) // sqrt(3) weights for non-boundary vertices
      { 
        return 2.0/3.0 * (cos(2.0*M_PI/val_++)+1.0); 
      }
      size_t val_;
    };
 
    std::vector<double> weights_;
    
  } coeffs_;
 
};
 
 
//=============================================================================
} // END_NS_UNIFORM
} // END_NS_SUBDIVIDER
} // END_NS_OPENMESH
//=============================================================================
#endif // OPENMESH_SUBDIVIDER_UNIFORM_COMPOSITESQRT3T_HH defined
//=============================================================================