source: GTP/trunk/Lib/Vis/Preprocessing/src/IntersectableWrapper.h @ 2538

#ifndef __INTERSECTABLEWRAPPER_H
#define __INTERSECTABLEWRAPPER_H

#include "AxisAlignedBox3.h"
#include "Intersectable.h"
#include "Triangle3.h"


namespace GtpVisibilityPreprocessor {


class KdNode;
class BvhLeaf;
class Ray;
class KdTree;
struct VssRayContainer;
struct Triangle3;
struct Face;

/** Wrapper used for creating a PVS compliant intersectable.
*/
template<typename T>
class IntersectableWrapper: public Intersectable
{
public:
        IntersectableWrapper(T item);

        /** Returns node associated with this instance. 
        */
        T GetItem() const;
        /** See get.
        */
        void SetItem(T item);


        /////////////////////////////////////////////
        //-- inherited functions from Intersectable

        AxisAlignedBox3 GetBox() const;
        
        int CastRay(Ray &ray);
        
        bool IsConvex() const;
        bool IsWatertight() const;
        float IntersectionComplexity();
  
        int NumberOfFaces() const;
        
        int GetRandomSurfacePoint(GtpVisibilityPreprocessor::Vector3 &point, 
                                                          GtpVisibilityPreprocessor::Vector3 &normal);

        int GetRandomVisibleSurfacePoint(GtpVisibilityPreprocessor::Vector3 &point,
                                                                         GtpVisibilityPreprocessor::Vector3 &normal,
                                                                         const GtpVisibilityPreprocessor::Vector3 &viewpoint,
                                                                         const int maxTries);
  
        std::ostream &Describe(std::ostream &s);
        
        int GetRandomEdgePoint(Vector3 &point, Vector3 &normal);


protected:
        
        T mItem;
};


template<typename T>
IntersectableWrapper<T>::IntersectableWrapper(T item):
Intersectable(), mItem(item)
{
}

template<typename T>
void IntersectableWrapper<T>::SetItem(T item)
{
        mItem = item;
}

template<typename T>
T IntersectableWrapper<T>::GetItem() const
{ 
        return mItem; 
}
        
template<typename T>
AxisAlignedBox3 IntersectableWrapper<T>::GetBox() const
{       // TODO matt
        return AxisAlignedBox3();
}

template<typename T>
int IntersectableWrapper<T>::CastRay(Ray &ray)
{       // TODO matt
        return 0;
}
        
template<typename T>
bool IntersectableWrapper<T>::IsConvex() const
{
        return true;
}

template<typename T>
bool IntersectableWrapper<T>::IsWatertight() const
{
        return true;
}


template<typename T>
float IntersectableWrapper<T>::IntersectionComplexity()
{
        return 1.0f;
}


template<typename T>
int IntersectableWrapper<T>::NumberOfFaces() const
{
        return 0;
}


template<typename T>
int IntersectableWrapper<T>::GetRandomSurfacePoint(Vector3 &point,
                                                                                                   Vector3 &normal)
{
        return 0;
}



template<typename T>
int IntersectableWrapper<T>::GetRandomEdgePoint(Vector3 &point,
                                                                                                Vector3 &normal)
{
        return 0;
}


template<typename T>
int IntersectableWrapper<T>::GetRandomVisibleSurfacePoint(Vector3 &point,
                                                                                                                  Vector3 &normal,
                                                                                                                  const Vector3 &viewpoint,
                                                                                                                  const int maxTries)
{
        return 0;
}
  
template<typename T>
std::ostream &IntersectableWrapper<T>::Describe(std::ostream &s)
{
        s << mItem;
        return s;
}


class KdIntersectable: public IntersectableWrapper<KdNode *>
{
public:
        KdIntersectable(KdNode *item, const AxisAlignedBox3 &box);
    
        int Type() const
        {
                return Intersectable::KD_INTERSECTABLE;
        }

    AxisAlignedBox3 GetBox() const 
        {
                return mBox;
        }

        /// the bounding box of this intersectable
        AxisAlignedBox3 mBox;
};


typedef std::map<KdNode *, KdIntersectable *> KdIntersectableMap;


class TriangleIntersectable: public IntersectableWrapper<Triangle3>
{
public:
        TriangleIntersectable(const Triangle3 &item):
        IntersectableWrapper<Triangle3>(item) {}

        int CastRay(Ray &ray);
        AxisAlignedBox3 GetBox() const;
        int NumberOfFaces() const;
        Vector3 GetNormal(const int idx) const;

        float GetArea() const {return mItem.GetArea();}

        int Type() const
        {
                return Intersectable::TRIANGLE_INTERSECTABLE;
        }

        int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal);

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

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

        int GetRandomEdgePoint(Vector3 &point, Vector3 &normal);

};


/** Intersectable acting as a proxy.
*/
class DummyIntersectable: public IntersectableWrapper<int>
{
public:
        DummyIntersectable(const int item):
          IntersectableWrapper<int>(item) { SetId(item); }

        int Type() const
        {
                return Intersectable::DUMMY_INTERSECTABLE;
        }
};


/** Intersectable wrapping is a group of objects.
*/
class ContainerIntersectable: public GtpVisibilityPreprocessor::IntersectableWrapper<ObjectContainer *>
{
public:
        ContainerIntersectable(ObjectContainer *item):
          IntersectableWrapper<ObjectContainer *>(item) {}

        // hack
        ContainerIntersectable::~ContainerIntersectable() 
        {
                delete mItem;
        }

        int Type() const
        {
                return Intersectable::CONTAINER_INTERSECTABLE;
        }
};

}

#endif