GU/GU_Attractor.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 */

#ifndef __GU_Attractor_h__
#define __GU_Attractor_h__

#include "GU_API.h"
#include <UT/UT_Vector3.h>

class GEO_Point;
class GU_Detail;
class GU_AttractorOffsets;
class GU_PtAttractorOffsets;

class GU_API GU_Attractor
{
public:
  
     GU_Attractor (void);
    ~GU_Attractor (void);

    void        setAttractor      (GU_Detail *gdp);

    // Get the force on a point/particle 
    GEO_Point*  getAttractorForce 
                    (const GEO_Point *ppt, 
                     UT_Vector3 &force,
                     int singleAttractor = 0,
                     unsigned num = 0);
    GEO_Point*  getAttractorForce 
                    (const UT_Vector4 &pos, 
                     UT_Vector3 &force,
                     int singleAttractor = 0,
                     unsigned num = 0);

    void        initPointAttractorForce();
    void        cleanPointAttractorForce();

private:
    GEO_Point*  getPointAttractorForce( const UT_Vector4 &pos, 
                                        UT_Vector3 &force,
                                        int singleAttractor,
                                        unsigned num);

    GU_Detail*                  attractor;
    GU_AttractorOffsets*        attOffsets;
    GU_PtAttractorOffsets*      ptAttOffsets;
    int                         myNmlOffset;
    int                         myComputedNormal;
};

#endif

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