source: GTP/trunk/Lib/Vis/Preprocessing/src/Intersectable.h @ 1176

#ifndef __INTERSECTABLE_H
#define __INTERSECTABLE_H

#include "AxisAlignedBox3.h"
#include "Pvs.h"
#include <set>

namespace GtpVisibilityPreprocessor {

struct VssRayContainer;
class KdLeaf;

class Intersectable {
public:
  // last mail id -> warning not thread safe!
  // both mailId and mailbox should be unique for each thread!!!
  static int sMailId;
  static int sReservedMailboxes;
  int mMailbox;
  
  /// unique object Id
  int mId;
  
  /// universal counter
  int mCounter;
        
  /// object based pvs
  KdPvs mKdPvs;
  
  /// view cell based pvs per object
  ViewCellPvs mViewCellPvs;

  /// kd leaves that this intersectable belongs to
  //set<KdLeaf *> mKdLeaves;

  /// # of object references
  int mReferences;

  enum { MESH_INSTANCE, 
                 TRANSFORMED_MESH_INSTANCE, 
                 SPHERE, 
                 VIEW_CELL, 
                 OGRE_MESH_INSTANCE,
                 KD_INTERSECTABLE
                };
  
  Intersectable(): mMailbox(0), mReferences(0) {}

        void SetId(const int id) { mId = id; }
        int GetId() { return mId; }
        

        static void NewMail(const int reserve = 1) {
                sMailId += sReservedMailboxes;
                sReservedMailboxes = reserve;
        }
        
        void Mail() { mMailbox = sMailId; }
        bool Mailed() const { return mMailbox == sMailId; }

        void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
        bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }

        int IncMail() { return ++ mMailbox - sMailId; }


    virtual AxisAlignedBox3 GetBox() const = 0;
        virtual int CastRay(GtpVisibilityPreprocessor::Ray &ray) = 0;
        
        virtual bool IsConvex() const = 0;
        virtual bool IsWatertight() const = 0;
        virtual float IntersectionComplexity() = 0;
  
        virtual int NumberOfFaces() const = 0;
        virtual int Type() const = 0;

        virtual int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal) = 0;

        virtual int GetRandomVisibleSurfacePoint(Vector3 &point,
                                                                                         Vector3 &normal,
                                                                                         const Vector3 &viewpoint,
                                                                                         const int maxTries) = 0;
  
        virtual ostream &Describe(ostream &s) = 0;
        
        virtual int GenerateSilhouetteRays(const int nrays,
                                                                           const AxisAlignedBox3 &originBox,
                                                                           const AxisAlignedBox3 &directionBox, VssRayContainer &rays) 
        {
                return 0;
        }

        static bool GreaterCounter(const Intersectable *a,
                                                         const Intersectable *b) 
        {
                return a->mCounter > b->mCounter;
        }

        static string GetTypeName(Intersectable *obj)
        {
                switch(obj->Type())
                {
                case MESH_INSTANCE:
                        return "mesh_instance\n";
                
                case TRANSFORMED_MESH_INSTANCE:
                        return "transformed_mesh_instance\n";
                        
                case SPHERE:
                        return "sphere\n";

                case VIEW_CELL:
                        return "view cell\n";
                
                case OGRE_MESH_INSTANCE:
                        return "ogre_mesh_instance\n";

                case KD_INTERSECTABLE:
                        return "kd_intersectable\n";

                default:
                        return "unknown\n";
                }
        }
};


}

#endif