WEMNearestPointOnSurface.h

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/*************************************************************************************
**
** Copyright 2019, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#pragma once
 
#include "WEMTools/WEMToolsIncludes.h"
 
// #define WEM_BSH_DEBUG   // un-comment this to get an idea of how many checks are performed
 
ML_START_NAMESPACE
 
namespace WEMBoundingSphereHierarchy {
  class TreeElement;
};

class MLWEM_EXPORT WEMNearestPointOnSurface
{
public:
  WEMNearestPointOnSurface(WEM* wem);
  ~WEMNearestPointOnSurface();

  bool isValid() const { return _bsh != nullptr; }

  struct Result
  {
    Result() : patch(nullptr), triangle(nullptr) { w[0] = 0; w[1] = 0; w[2] = 0; }

    WEMTrianglePatch* patch;
    WEMTriangle* triangle;
    double w[3];
  };

  Result getNearestTriangle(const Vector3& p) const;
 
#ifdef WEM_BSH_DEBUG
  // debugging interface:
  static void incSphereChecks() { _sphereChecks++; }
  static void incTriangleChecks() { _triangleChecks++; }
#endif
 
private:
  WEMBoundingSphereHierarchy::TreeElement* _bsh;
 
  // debugging/profiling data
  int _usedTriangleCount;
#ifdef WEM_BSH_DEBUG
  // this is not thread-safe!!!
  static int _sphereChecks;
  static int _triangleChecks;
#endif
};
 
 
 
 
ML_END_NAMESPACE