source: GTP/trunk/Lib/Vis/Preprocessing/src/Intersectable.h @ 1687

#ifndef __INTERSECTABLE_H
#define __INTERSECTABLE_H

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

namespace GtpVisibilityPreprocessor {

struct VssRayContainer;
class KdLeaf;
class BvhLeaf;
class BvhNode;
class Intersectable;
struct Face;


struct FaceParentInfo {
        /// intersectable
        Intersectable *mObject;
        /// face index
        int mFaceIndex;

        FaceParentInfo(Intersectable *obj, const int fi):
        mObject(obj), mFaceIndex(fi)
        {}
};


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;

  /// Mailbox used for traversals
  int mMailbox;
  
  /// unique object Id
  int mId;

  /// universal counter
  int mCounter;

  /// pointer to the containing bvh leaf
  BvhLeaf *mBvhLeaf;
//BvhNode *mBvhLeaf;
  /// some rays piercing this intersectable
  VssRayContainer mVssRays;

  /// # of references to this instance
  int mReferences;

  //////////////////
  // note matt: delete these, they are only taking memory+


  /// object based pvs
  KdPvs mKdPvs;

  /// view cell based pvs per object
  ViewCellPvs mViewCellPvs;
        
  ///////////////////////

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

  virtual Intersectable::~Intersectable() {};

  void SetId(const int id) { mId = id; }
  int GetId() { return mId; }
  
  ////////////////////////////////////////////////
  //    Mailing stuff
  
  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 float GetArea() const {return 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";
          }
  }

  /** returns normal from the face with the specified index.
  PROBLEM: Does not fit to all intersectable types (e.g., spheres)
  */
  virtual Vector3 GetNormal(const int idx) const { return Vector3(0, 0, 0); }
};


}

#endif