D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlGraphics/DistanceLODEvaluator.hpp

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#ifndef DistanceLODEvaluator_INCLUDE_ONCE
#define DistanceLODEvaluator_INCLUDE_ONCE

#include <vlGraphics/Actor.hpp>

namespace vl
{
  //-----------------------------------------------------------------------------
  // DistanceLODEvaluator
  //-----------------------------------------------------------------------------
  class DistanceLODEvaluator: public LODEvaluator
  {
  public:
    DistanceLODEvaluator() 
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }
    virtual const char* className() { return "vl::DistanceLODEvaluator"; }
    virtual int evaluate(Actor* actor, Camera* camera)
    {
      if (mDistanceRangeSet.empty())
        return 0;

      vec3 center = actor->transform() ? actor->transform()->worldMatrix() * actor->lod(0)->boundingBox().center() : actor->lod(0)->boundingBox().center();
      double dist = (camera->inverseViewMatrix().getT() - center).length();

      // we assume the distances are sorted in increasing order
      int i=0;
      for(; i<(int)mDistanceRangeSet.size(); ++i)
      {
        if (dist<mDistanceRangeSet[i])
          return i;
      }

      return i; // == mDistanceRangeSet.size()
    }

    const std::vector<double>& distanceRangeSet() { return mDistanceRangeSet; }
    void clearDistanceRangeSet() { mDistanceRangeSet.clear(); }
    int distanceRangeCount() const { return (int)mDistanceRangeSet.size(); }
    double distanceRange(int index) const { return mDistanceRangeSet[index]; }

    void setDistanceRangeSet(const std::vector<double>& distance_set) { mDistanceRangeSet = distance_set; std::sort(mDistanceRangeSet.begin(), mDistanceRangeSet.end()); }
    void addDistanceRange(double distance) { mDistanceRangeSet.push_back(distance); std::sort(mDistanceRangeSet.begin(), mDistanceRangeSet.end()); }
    void setDistanceRange(int index, double distance) { mDistanceRangeSet[index] = distance; std::sort(mDistanceRangeSet.begin(), mDistanceRangeSet.end()); }

  protected:
    std::vector<double> mDistanceRangeSet;
  };
}

#endif