PointEmittance.h

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/* $Id:$ */

#ifndef __POINT_EMITTANCE_H
#define __POINT_EMITTANCE_H

#include <esg/emittance/Emittance.h>
#include <esg/geometry/Sphere.h>

/*
 * Omnidirectional emittance from single point.
 */

namespace esg {

class PointEmittance : public Emittance {
protected:
    static Sphere _stochasticEmitter;
    
protected:
    virtual void _duplicate_attributes (const Emittance& src) {
        Emittance::_duplicate_attributes(src);
    }

    PointEmittance () {}
    
public:
    PointEmittance (const Vector3&  loc,
                    const Color3f&  inten = Color3f(1,1,1),
                    double          fadeDist  = .0,
                    double          fadePower = .0)
        : Emittance(loc,true,Vector3(0,0,0),false,inten,fadeDist,fadePower) {}

    virtual Emittance* clone () const;

    virtual bool intensity (const Vector3& /* view point */,
                            Color3f&       /* intensity  */) const;

    virtual bool intensity (const Vector3& /* emittance direction */,
                            float          /* emittance distance  */,
                            Color3f&       /* intensity           */) const;

    virtual bool stochasticEmission (Vector3& d);
};
    
}; // namespace

#endif // __POINT_EMITTANCE_H

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