GU_Spring.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_Spring_h__
#define __GU_Spring_h__

#include "GU_API.h"
#include <UT/UT_ValArray.h>
#include <GEO/GEO_Detail.h>
#include "GU_Topology.h"

class GA_ROAttributeRef;
class GU_SpringEdge;

class GU_API GU_Spring 
{
public:

             GU_Spring();
    virtual ~GU_Spring();

    void        setupEdges      (GU_Detail *gdp, GA_PrimitiveGroup *group = 0,
                                 int force = 0);
    void        computeEdges    (GU_Detail *gdp, int behavior, 
                                 float tension,
                                 const GA_ROAttributeRef &tensionoffset,
                                 const GA_ROAttributeRef &veloffset,
                                 float timeinc);
    void        getForce        (UT_Vector3& force, GA_Offset ptoff, GA_Index ptind,
                                 float springk,
                                 const GA_ROHandleF &springkattrib);

private:

    UT_ValArray<GU_SpringEdge*>         edges;
    GU_Topology                         topology;

    void        cleanEdges      ();
    void        buildEdges      (GEO_Primitive *prim);

};

#endif