GU_PolyReduce.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.
 *
 * NAME:        Polygonal reduction tool (C++)
 *
 * COMMENTS:
 */

#ifndef __GU_PolyReduce_h__
#define __GU_PolyReduce_h__

#include "GU_API.h"
#include <UT/UT_Vector3.h>
class GA_EdgeGroup;
class GEO_Detail;

// Description of a single edge collapse
class GU_API GU_EdgeCollapseNode
{
public:
    int                          myIv1, myIv2;  // Source indices to reduce.
    int                          myNewIv;       // Resulting index.
    int                          myDegenTri;    // Tris removed
    UT_Vector3                   myV;           // Resulting position.
    int                          myNewPt;       // New point number
    
private:
    friend class GU_EdgeCollapseList;
    GU_EdgeCollapseNode         *myNext, *myPrev;
};

// A list of edge collapses:
class GU_API GU_EdgeCollapseList
{
public:
    GU_EdgeCollapseList() { myHead = 0; myTail = 0; }
    ~GU_EdgeCollapseList();

    GU_EdgeCollapseNode         *next(GU_EdgeCollapseNode *node);
    void                         remove(GU_EdgeCollapseNode *node);
    void                         append(GU_EdgeCollapseNode *node);
    int                          empty() const { return myHead ? 0 : 1; }
    GU_EdgeCollapseNode         *first() const { return myHead; }

private:
    GU_EdgeCollapseNode         *myHead, *myTail;
};

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

    int         numpolys;       // Number of polys to reduce to.
    float       percentage;     // Percentage to reduce
    int         usepercent;     // Which method to use.
    bool        useedgelimit;   // Constrain number of edges to collapse
    int         numedgecollapse;// Max edges to collapse.
    int         meshinvert;     // Test for mesh inversion?
    float       optimization;   // 1 for optimized point positions
                                // 0 for just mid points
    float       borderweight;   // Weighting to add to border planes
    float       lengthweight;   // Weighting to add to the length of sides
    int         keepedges;      // Never collapse the edges
    int         snap;           // Snap to existing vertices

    // Feature edgse:
    GEO_Detail   *gdpf;                 // Detail containing feature edges
    const GA_EdgeGroup *features;       // Feature edges
    const GA_EdgeGroup *forcecollapse;  // Edges to collapse.
    float         featureweight;        // The weight thereof

    int         altergeo;       // Do we change the geometry at all?

    GU_EdgeCollapseList *edgelist;      // Where we accumulate all ecols.
    int         uniquevertex;   // Number unique vertex
    int         initialtris;    // Number stris started with

    float       attribweight;   // Importance of the weight attribute.
    float       topologicalweight;      // Penalty factor for high valences.
};
    

#endif