GU/GU_TriDivide.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:
 *      Jeff Lait
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        GU_TriDivide.h ( GU Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GU_TriDivide__
#define __GU_TriDivide__

#include "GU_API.h"
class GB_PrimitiveGroup;
class guDivTri;
class UT_HashTable;

class GU_API GU_TriDivide
{
public:
    GU_TriDivide(GU_Detail *gdp);

    virtual ~GU_TriDivide();

    void         setDetail(GU_Detail *gdp) { myGdp = gdp; }
    GU_Detail   *getDetail() const { return myGdp; }

    void         setRefDetail(const GU_Detail *refgdp) { myRefGdp = refgdp; }
    const GU_Detail *getRefDetail() const { return myRefGdp; }

    /// Builds the triangle list.
    void         buildTopology(const GB_PrimitiveGroup *grp=0);
    
    /// Does root(3) subdivision.
    void         tridivide(int depth);

    /// Equalizes edges by splitting the longest edges.
    /// Splits are done until minimum length is less than minlength
    /// or number of splits numsplits has been done.  A value of -1
    /// is ignored.
    void         equalizeEdges(fpreal minlength, int numsplit);

    /// Transforms the triangle list into actual triangles.
    void         buildGeometry();

    /// Technically should be friended to our guDivTri.
    guDivTri    *allocTri();

protected:
    void         buildTri(GEO_PrimPoly *poly, UT_HashTable &hash);

    fpreal       calculateLength(int aidx, int bidx,
                                bool useref,
                                const UT_Vector3Array &refpos) const;

protected:
    GU_Detail                   *myGdp;
    const GU_Detail             *myRefGdp;
    UT_PtrArray<guDivTri *>      myTriList;
};

#endif

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