source: GTP/trunk/Lib/Vis/Preprocessing/src/Intersectable.h @ 2543

#ifndef __INTERSECTABLE_H
#define __INTERSECTABLE_H


#include "AxisAlignedBox3.h"
#include "Mailable.h"

#define STORE_VIEWCELLS_WITH_BVH 1

namespace GtpVisibilityPreprocessor {

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


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

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


class Intersectable 
{
public:

        ///////////////////////

        enum {MESH_INSTANCE, 
                TRANSFORMED_MESH_INSTANCE, 
                SPHERE, 
                VIEW_CELL, 
                OGRE_MESH_INSTANCE,
                KD_INTERSECTABLE,
                BVH_INTERSECTABLE,
                TRIANGLE_INTERSECTABLE,
                DUMMY_INTERSECTABLE,
                ENGINE_INTERSECTABLE,
                CONTAINER_INTERSECTABLE
        };

        Intersectable();

        virtual ~Intersectable();

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

        // 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;


        ////////////////
        // virtual interface

        virtual AxisAlignedBox3 GetBox() const = 0;
        virtual int CastRay(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 GetRandomEdgePoint(Vector3 &point,
                Vector3 &normal) = 0;

        virtual int GetRandomVisibleSurfacePoint(Vector3 &point,
                Vector3 &normal,
                const Vector3 &viewpoint,
                const int maxTries) = 0;

        // virtual int GetRandomPoint(Vector3 &point,
        // vector3 &normal) = 0;

        virtual std::ostream &Describe(std::ostream &s) = 0;

        //////////////////////////////////////


        virtual int GenerateSilhouetteRays(const int nrays,
                const AxisAlignedBox3 &originBox,
                const AxisAlignedBox3 &directionBox, 
                VssRayContainer &rays); 

        virtual int GetRandomSurfacePoint(const float u,
                const float v,
                Vector3 &point,
                Vector3 &normal);

        virtual float GetArea() const;

        static bool GreaterCounter(const Intersectable *a,
                const Intersectable *b);

        /** Returns the name of the type of this intersectable
        */
        static std::string GetTypeName(Intersectable *obj);
        /** 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;
        /** Returns rays stored with this intersectable.
        */
        VssRayContainer *GetOrCreateRays();

        /** Deletes the rays associated with this intersectable.
        */
        void DelRayRefs();

        /// hack
        int mRenderedFrame;

        ///////////

        /// unique object Id
        int mId;
        /// universal counter
        int mCounter;
        /// pointer to the containing bvh leaf
        BvhLeaf *mBvhLeaf;


protected:

        /// some rays piercing this intersectable
        VssRayContainer *mVssRays;


#if STORE_VIEWCELLS_WITH_BVH
public:
        /** Returns rays stored with this intersectable.
        */
        ViewCellContainer *GetOrCreateViewCells();

        void DelViewCells();

protected:
        ViewCellContainer *mViewCells;
#endif
};


}

#endif