source: GTP/trunk/Lib/Vis/Preprocessing/src/RayCaster.h @ 1824

#ifndef _RayCaster_H__
#define _RayCaster_H__

#include "Containers.h"
#include <string>
#include "Vector3.h"

using namespace std;


namespace GtpVisibilityPreprocessor {


class Intersectable;
class VssRay;
class SimpleRayContainer;
class AxisAlignedBox3;
//class Vector3;
struct VssRayContainer;
class Preprocessor;
struct SimpleRay;


/** This class provides an interface for ray casting.
*/
class RayCaster
{

public:
        
        enum {
          INTERNAL_RAYCASTER = 0,
          INTEL_RAYCASTER
        };

        RayCaster(const Preprocessor &preprocessor);

        virtual ~RayCaster();

        virtual int Type() const = 0;

        /** Wrapper for casting single ray.
                @returns ray or NULL if invalid
        */
        VssRay *CastRay(
                const SimpleRay &simpleRay,
            const AxisAlignedBox3 &box,
                const bool castDoubleRay
                );

        virtual int CastRay(
                const SimpleRay &simpleRay,
        VssRayContainer &vssRays,
                const AxisAlignedBox3 &box,
                const bool castDoubleRay,
                const bool pruneInvalidRays = true
                ) = 0;

         virtual void CastRays16(
                 const int i,
                 SimpleRayContainer &rays, 
                 VssRayContainer &vssRays,
                 const AxisAlignedBox3 &sbox,
                 const bool castDoubleRay,
                 const bool pruneInvalidRays = true
                 ) = 0;
        

protected:
        struct Intersection
        {
                Intersection(): mObject(NULL), mFaceId(0)
                {}

                Intersection(const Vector3 &p, const Vector3 &n, Intersectable *o, const int f):
                        mPoint(p), mNormal(n), mObject(o), mFaceId(f)
                {}

                Intersection(const Vector3 &p): mPoint(p), mObject(NULL), mFaceId(0)
                {}
                Vector3 mPoint;
                Vector3 mNormal;
                Intersectable *mObject;
                int mFaceId;
        };


        int ProcessRay(
                         const SimpleRay &ray,
                         Intersection &hitA,
                         Intersection &hitB,
                         VssRayContainer &vssRays,
                         const AxisAlignedBox3 &box,
                         const bool castDoubleRay,
                         const bool pruneInvalidRays = true
                         );

        /** Checks if ray is valid.
                I.e., the ray is in valid view space.
                @note: clamps the ray to valid view space.
        */
        bool ValidateRay(const Vector3 &origin,
                                         const Vector3 &direction,
                                 const AxisAlignedBox3 &box,
                                         Intersection &hit);
        
        const Preprocessor &mPreprocessor;
};


}

#endif