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Cluster.h

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/*
    File:       Cluster.h

    Function:   Implements hierarchical radiosity clusters

    Author:     Andrew Willmott

    Copyright:  (c) 1997-2000, Andrew Willmott
*/

#ifndef __Cluster__
#define __Cluster__

#include "HRElem.h"


class Cluster : public HRElem
{
public:
                Cluster();
    virtual     ~Cluster();

    Void        SetElems(HRElemList *elemIn);
    Cluster     *CreateHierarchy();

    Void        PushElems();
    Void        CreateBounds();

    Void        DrawNodeElem(Renderer &r);
    Void        DrawLeafElem(Renderer &r);
    Void        DrawPatches(Renderer &r);

    Void        Print(ostream &s);

    // radiosity routines.  
    Void        Reset();
    Bool        IsLeaf();
    Void        ApplyToChildren(Void (HRElem::*method)(Void*), Void *ref = 0);

    Void        EltUpdateBounds(Point &, Point &)
                { return; };
    GCLReal     EltArea()   
                { return(clusterArea); };
    GCLReal     EltProjArea(const Vector &n);
    GCLReal     EltMaxProjArea(const Vector &n);
    Point       EltCentre() 
                { return(centre); };
    Colour      EltE()      
                { return(E); };
    Colour      EltRho()    
                { return(maxRho); };
    Void        EltSampleTransport(Int numSamples, Point p[], Vector n[],
                        Matd &coeffs);
    GCLReal     EltCalcTransport(HRElem *from, Matd &coeffs);

    Void        AddIrradiance(const Colour &E, const Vector &m);
    Colour      GetPower(const Vector &m);
    Void        EltGetSamples(Int numSamples, Point pts[]);

    Void        DistributeColours();
    Void        DistributeColoursBest(ShadeInfo &shadeInfo);

    GCLReal     Error();
    Void        Add();
    Void        Push();
    Void        Pull();
    Void        ClearB();
    Void        ClearR();
    Void        CalcLeafRadiosity();
    Void        InitRad();

    Void        MakeChildLinks(HRElem *other, HRLink *link,
                               Int which, Int levels);
    Void        EltSetVisPoints(HRElem *to, Point p[]);

    // Misc
    Int         NumCoeffs() { return(1); }
    Colour      *B_Coeffs() { return(&B); };
    Colour      *R_Coeffs() { return(&R); };

    // Fields
    Point       min, max;       // bounds
    Point       centre;
    Int         level;
    HRElemList  elems;          // non-cluster elements held by this cluster
    Cluster     *child[8];      // child clusters

    GCLReal     clusterVol;     // volume of the cluster
    GCLReal     clusterArea;    // surface area contained by cluster
    Colour      maxRho;         // max reflectivity in cluster
    Colour      E;              // emittance -- currently unused.
    Colour      B;
    Colour      R;
    static Colour lastB;
};

#endif

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