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HRMesh.h

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/*
    File:           HRMesh.h

    Function:       Defines a hierarchical mesh for use with hierarchical/
                    wavelet radiosity methods.
                    
    Author(s):      Andrew Willmott

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


#ifndef __HRMesh__
#define __HRMesh__

#include "HRElem.h"
#include "HierMesh.h"

// --- Hierarchical Radiosity mesh element ------------------------------------


class HRMeshElem : public HRElem, public HierElem
{
public:
                    HRMeshElem();

    Void            Reset();
    Void            Print(ostream &s);
    Void            CreatePatches(PatchList &patches);

    Bool            IsLeaf()
                    { return((flags & hrIntNode) == 0); };
    Void            ApplyToChildren(Void (HRElem::*method)(Void*), 
                                    Void *ref = 0);
    Void            MakeChildLinks(HRElem *other, HRLink *link, 
                                   Int which, Int levels);
    HRMeshElem      *Child(Int i)
                    { return((HRMeshElem*) child[i]); };

    Void            Draw(Renderer &r);
    Void            DrawNodeElem(Renderer &r);
    Void            DrawLeafElem(Renderer &r);
    Void            DrawMatrixRec(Void *dmi);

    Void            EltUpdateBounds(Point &min, Point &max);
    GCLReal         EltArea()   { return(area); };
    GCLReal         EltProjArea(const Vector &v)
                                { return(area * Max(0.0, dot(normal, v))); };
    Point           EltCentre() { return(centre); };
    Colour          EltE()      { return(Emittance()); };
    Colour          EltRho()    { return(Reflectance()); };

    Void            EltSetVisPoints(HRElem *to, Point p[]);
    Void            EltGetSamples(Int numSamples, Point pts[]);

    // --- kernel sampling... -------------------------------------------------
    
    Void            SampleKernel(
                            const GCLMat    &fromU,     // source patch samples         
                            HRMeshElem      *to,        // dest. patch
                            const GCLMat    &toU,       // destination samples
                            GCLMat          &samples,   // results of sampling
                            GCLReal         *visPtr     // accumulate visibility
                        );
    Void            SubToSubFormFactor(
                            Int         nFrom, 
                            HRMeshElem  *to,
                            Int         nTo, 
                            GCLMat      &samples, 
                            GCLReal     *visPtr
                        );
    Void            EstSubFormFactor(
                            Int             nFrom, 
                            HRMeshElem      *to,
                            const GCLMat    &toU,
                            GCLMat          &samples, 
                            GCLReal         *visPtr
                        );
    Void            DrawSampledLeaf(Renderer &r, Int n);
    Void            HRCorrectLeaves();
    Void            SetHighlight(Int h);
};

#endif

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