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.
 *
 */

#ifndef __GU_Attractor_h__
#define __GU_Attractor_h__

#include "GU_API.h"
#include <UT/UT_Vector3.h>
#include <GA/GA_AttributeRef.h>
#include <GA/GA_Handle.h>

class GU_Detail;
class GU_AttractorOffsets;
class GU_PtAttractorOffsets;

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

    void        setAttractor      (GU_Detail *gdp);
    GU_Detail   *getAttractor() const { return attractor; }

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

    void        initPointAttractorForce();
    void        cleanPointAttractorForce();

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

    GU_Detail*                  attractor;
    GU_AttractorOffsets*        attOffsets;
    GU_PtAttractorOffsets*      ptAttOffsets;
    GA_ROAttributeRef           myNmlOffset;
    GA_ROHandleV3               myNmlHandle;
    int                         myComputedNormal;
};

#endif