CWE-ou-minkata/Sources/Tools/MaxComponent/plClusterComponent.cpp

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
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 or by snail mail at:
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*==LICENSE==*/
#include "HeadSpin.h"


#include "max.h"
#include "meshdlib.h" 
#include "dummy.h"
#include "resource.h"
#include "plComponent.h"
#include "plComponentReg.h"
#include "MaxMain/plPlasmaRefMsgs.h"

#include "MaxExport/plExportProgressBar.h"
#include "MaxMain/plMaxNode.h"

#include "hsTypes.h"

#include "hsBitVector.h"
#include "plMath/hsRadixSort.h"
#include "plMath/plRandom.h"
#include "pfAnimation/plBlower.h"

#include "plDicer.h"
#include "plDistribComponent.h"
#include "MaxConvert/plDistributor.h"
#include "MaxConvert/plDistTree.h"
#include "plMiscComponents.h"

#include "plClusterComponent.h"


#include "MaxConvert/plClusterUtil.h"
#include "plDrawable/plClusterGroup.h"
#include "plDrawable/plSpanTemplate.h"

#include <vector>

/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
// Start with the component bookkeeping song and dance.
// Actual working code follows.
/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
void DummyCodeIncludeFuncCluster()
{

}

class plClusterComponentProc : public ParamMap2UserDlgProc
{
public:
    BOOL DlgProc(TimeValue t, IParamMap2 *map, HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
    {
        switch (msg)
        {
        case WM_COMMAND:
            if( (HIWORD(wParam) == BN_CLICKED) && (LOWORD(wParam) == IDC_CLUSTER_DO_THE_DANCE) )
            {
                plClusterComponent* cc = (plClusterComponent*)map->GetParamBlock()->GetOwner();
                cc->Cluster(nil);

                return TRUE;
            }
            if( (HIWORD(wParam) == BN_CLICKED) && (LOWORD(wParam) == IDC_CLUSTER_CLEAR) )
            {
                plClusterComponent* cc = (plClusterComponent*)map->GetParamBlock()->GetOwner();
                cc->Clear();

                return TRUE;
            }
            break;
        }

        return false;
    }
    void DeleteThis() {}
};
static plClusterComponentProc gClusterCompProc;

//Max desc stuff necessary below.
CLASS_DESC(plClusterComponent, gClusterCompDesc, "Cluster",  "Cluster", COMP_TYPE_DISTRIBUTOR, CLUSTER_COMP_CID)

class plClusterCompAccessor : public PBAccessor
{
public:
    void Set(PB2Value& v, ReferenceMaker* owner, ParamID id, int tabIndex, TimeValue t)
    {
        if( id == plClusterComponent::kWindBones )
        {
            plClusterComponent *comp = (plClusterComponent*)owner;
            comp->NotifyDependents(FOREVER, PART_ALL, REFMSG_USER_COMP_REF_CHANGED);
        }
    }
};
plClusterCompAccessor gClusterCompAccessor;

ParamBlockDesc2 gClusterBk
(   
    plComponent::kBlkComp, _T("Cluster"), 0, &gClusterCompDesc, P_AUTO_CONSTRUCT + P_AUTO_UI, plComponent::kRefComp,

    IDD_COMP_CLUSTER, IDS_COMP_CLUSTERS, 0, 0, &gClusterCompProc,

    plClusterComponent::kClusters,  _T("Clusters"), TYPE_INODE_TAB, 0,      0, 0,
        end,

    plClusterComponent::kOptimization, _T("Optimization"), TYPE_FLOAT,  0, 0,   
        p_default, 100.0,
        p_range, 0.0, 100.0,
        p_ui,   TYPE_SPINNER,   EDITTYPE_POS_FLOAT, 
        IDC_COMP_CLUSTERSIZE, IDC_COMP_CLUSTERSIZE_SPIN, 1.0,
        end,    

    plClusterComponent::kFadeIns, _T("FadeIns"), TYPE_POINT3_TAB, 0,    0, 0,
        end,

    plClusterComponent::kFadeOuts, _T("FadeOuts"), TYPE_POINT3_TAB, 0,  0, 0,
        end,

    // OBSOLETE
    plClusterComponent::kWindBone, _T("WindBone"),  TYPE_INODE,     0, 0,
//      p_ui,   TYPE_PICKNODEBUTTON, IDC_COMP_CLUSTER_WINDBONE,
//      p_prompt, IDS_COMP_CLUSTER_CHOSE_WINDBONE,
        end,

    plClusterComponent::kWindBones, _T("WindBones"),    TYPE_INODE_TAB, 0,      0, 0,
        end,

    plClusterComponent::kAutoGen,   _T("AutoGen"),  TYPE_BOOL,      0, 0,
        p_default,  FALSE,
        p_ui,   TYPE_SINGLECHEKBOX, IDC_COMP_CLUST_AUTOEXPORT,
        end,

    plClusterComponent::kAutoInstance,  _T("AutoInstance"), TYPE_BOOL,      0, 0,
        p_default,  FALSE,
        p_ui,   TYPE_SINGLECHEKBOX, IDC_COMP_CLUST_AUTOINSTANCE,
        end,

    end
);


hsBool plClusterComponent::SetupProperties(plMaxNode *node, plErrorMsg *pErrMsg)
{
    fSetupDone = false;
    fExported = false;

    int numClust = fCompPB->Count(kClusters);
    int i;
    for( i = numClust-1; i >= 0; --i )
    {
        if( !fCompPB->GetINode(kClusters, TimeValue(0), i) )
            fCompPB->Delete(kClusters, i, 1);
    }

    return true;
}

static int CompTemplNodes(const void *elem1, const void *elem2) 
{
    plDistribInstance* distA = (plDistribInstance*)elem1;
    plDistribInstance* distB = (plDistribInstance*)elem2;
    
    plMaxNode* a = (plMaxNode*)distA->fNode;
    plMaxNode* b = (plMaxNode*)distB->fNode;
    
    if( a == b )
        return 0;
    
    if( a->GetRenderLevel(!a->GetNoDeferDraw()) < b->GetRenderLevel(!b->GetNoDeferDraw()) )
        return -1;
    if( a->GetRenderLevel(!a->GetNoDeferDraw()) > b->GetRenderLevel(!b->GetNoDeferDraw()) )
        return 1;
    
    if( a < b )
        return -1;
    
    return 1;
}

hsBool plClusterComponent::PreConvert(plMaxNode *node, plErrorMsg *pErrMsg)
{
    if( !fSetupDone )
    {
        int numClust = fCompPB->Count(kClusters);
        int i;
        for( i = 0; i < numClust; i++ )
        {
            plMaxNodeBase* clust = (plMaxNodeBase*)fCompPB->GetINode(kClusters, TimeValue(0), i);
            if( clust )
            {
                Box3 fade(fCompPB->GetPoint3(kFadeIns, TimeValue(0), i), fCompPB->GetPoint3(kFadeOuts, TimeValue(0), i));

                // Deal here is that, although we'd love to properly sort all the time, most of the time we don't
                // need to and/or can't afford it, at least with the closeup dense plants. This is a sort of hacky
                // way to guess whether we can afford a proper sort. The idea is that anything that is only visible
                // from farther than N feet away is probably some cheap imposter kind of representation that we can
                // afford to face sort (it's likely to be two sided convex objects too, which means it'll need the sort).
                // Can we do better? Not tonight.
                const float kMinDistantFadeIn = 70.f;
                const float kMaxDistantFadeOut = 10.f;
                BOOL faceSort = false;
                if( fade.Min()[2] < 0 )
                {
                    if( fade.Min()[0] > kMinDistantFadeIn )
                        faceSort = true;
                }
                else if( fade.Max()[2] > 0 )
                {
                    if( fade.Max()[1] < kMaxDistantFadeOut )
                        faceSort = true;
                }
                if( faceSort )
                    faceSort = true;

                clust->SetFade(fade);
                clust->SetNoDeferDraw(true);
                clust->SetNoFaceSort(!faceSort);
                clust->SetNormalChan(plDistributor::kNormMapChan);

                if( i < fCompPB->Count(kWindBones) )
                {
                    plMaxNodeBase* windBone = (plMaxNodeBase*)fCompPB->GetINode(kWindBones, TimeValue(0), i);
                    // FISHHACK
                    // BoneUpdate
                    // Add clust as first bone, windBone as second.
                    if( windBone && (windBone != clust) )
                        clust->AddBone(windBone);
                }
            }
        }
        
        ISetupRenderDependencies();

        fClusterGroups.clear();
        
        if (fCompPB->GetInt(kAutoInstance))
        {
            hsBitVector doneBits;
            
            IBuildDistribTab();
            if( !fDistribTab.Count() )
            {
                fSetupDone = true;
                return true;
            }
            
            plDistribInstTab nodes;
            
            plExportProgressBar bar;
            if( IBuildNodeTab(nodes, pErrMsg, bar) )
            {
                nodes.Sort(CompTemplNodes);
                
                plClusterUtil util;
                
                int i = 0;
                while( i < nodes.Count() )
                {
                    plMaxNode* repNode = (plMaxNode*)nodes[i].fNode;
                    
                    int nextNode;
                    for( nextNode = i+1; (nextNode < nodes.Count()) && (nodes[i].fNode == nodes[nextNode].fNode); nextNode++ )
                    {} // intentional, we just want the i value

                    // As far as I can tell, we don't actually use the templates generated here, we just use the count
                    // to know how many groups to create, and then generate the templates again in Convert().
                    // Looks like a hack that never got cleaned up.
                    plSpanTemplTab templs = util.MakeTemplates(repNode);
                    int j;
                    for( j = 0; j < templs.Count(); j++ )
                    {
                        fClusterGroups.push_back(util.CreateGroup(repNode, GetINode()->GetName()));
                        delete templs[j];
                    }

                    i = nextNode;
                }
            }
            IClearNodeTab();
            IClearDistribTab();
        }

        fSetupDone = true;
    }
    return true;
}

hsBool plClusterComponent::Convert(plMaxNode *node, plErrorMsg *pErrMsg) 
{ 
    if( !fExported && (fCompPB->GetInt(kAutoInstance)) )
    {
        hsBitVector doneBits;

        IBuildDistribTab();
        if( !fDistribTab.Count() )
        {
            fExported = true;
            return true;
        }

        plDistribInstTab nodes;

        plExportProgressBar bar;
        if( IBuildNodeTab(nodes, pErrMsg, bar) )
        {
            nodes.Sort(CompTemplNodes);

            plClusterUtil util;

            plDeformVert defVert;
            plShadeVert shadeVert;

            int groupIdx = 0;
            int i = 0;
            while( i < nodes.Count() )
            {
                plL2WTab l2wTab;
                plMaxNode* repNode = (plMaxNode*)nodes[i].fNode;

                Matrix3 l2w = nodes[i].fObjectTM;
                l2wTab.Append(1, &l2w);

                int nextNode;
                for( nextNode = i+1; (nextNode < nodes.Count()) && (nodes[i].fNode == nodes[nextNode].fNode); nextNode++ )
                {
                    l2wTab.Append(1, &nodes[nextNode].fObjectTM);
                }

                plSpanTemplTab templs = util.MakeTemplates(repNode);
                int j;
                for( j = 0; j < templs.Count(); j++ )
                {
                    util.SetupGroup(fClusterGroups[groupIdx], repNode, templs[j]);
                    groupIdx++;

                    util.AddClusters(l2wTab, nil, nil);

                }
                i = nextNode;
            }
        }
        IClearNodeTab();
        IClearDistribTab();
        fExported = true;
    }
    return true; 
}

plClusterComponent::plClusterComponent()
{
    fClassDesc = &gClusterCompDesc;
    fClassDesc->MakeAutoParamBlocks(this);

    fClusterBins = nil;
    fSizes[0] = fSizes[1] = fSizes[2] = 0;

    fAutoGen = FALSE;
}


void plClusterComponent::ICheckWindBone()
{
}

/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
// Working end of the gun follows below this line.
/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////

BOOL plClusterComponent::AutoGen(plErrorMsg* pErrMsg)
{
    if( !fCompPB->Count(kClusters) && fCompPB->GetInt(kAutoGen) )
    {
        fAutoGen = true;
        return Cluster(pErrMsg);
    }
    return false;
}

void plClusterComponent::AutoClear(plErrorMsg* pErrMsg)
{
    if( fAutoGen )
    {
        Clear();
        fAutoGen = false;
    }
}

void plClusterComponent::IBuildDistribTab()
{
    plDistribCompTab& tab = fDistribTab;
    tab.ZeroCount();
    // Okay, laziest hackiest sort algorithm in the world follows.
    // But it's okay, the number of distributors is small.
    plDistribCompTab sortTab;
    Tab<float> valTab;
    // For each target
    int numTarg = NumTargets();
    int i;
    for( i = 0; i < numTarg; i++ )
    {
        plMaxNodeBase* targ = GetTarget(i);
        if( targ )
        {
            UInt32 count = targ->NumAttachedComponents();
            int j;
            for( j = 0; j < count; j++ )
            // For each DistribComponent
            {
                plComponentBase *comp = targ->GetAttachedComponent(j);
                if( comp && (comp->ClassID() == DISTRIBUTOR_COMP_CID) )
                {
                    // Add DistribComponent replicants to nodeTab
                    // making sure we don't add any nodes twice.
                    plDistribComponent* distComp = (plDistribComponent*)comp;
                    int k;
                    for( k = 0; k < sortTab.Count(); k++ )
                    {
                        if( distComp == sortTab[k] )
                            break;
                    }
                    if( k == sortTab.Count() )
                    {
                        sortTab.Append(1, &distComp);
                        float val = distComp->GetIsoPriority();
                        valTab.Append(1, &val);
                    }
                }

            }
        }
    }
    BitArray gotten(sortTab.Count());
    while( tab.Count() < sortTab.Count() )
    {
        float maxVal = -1.f;
        int maxIdx = -1;
        for( i = 0; i < sortTab.Count(); i++ )
        {
            if( !gotten[i] )
            {
                if( valTab[i] > maxVal )
                {
                    maxVal = valTab[i];
                    maxIdx = i;
                }
            }
        }
        gotten.Set(maxIdx);
        tab.Append(1, &sortTab[maxIdx]);
    }
}

void plClusterComponent::IClearDistribTab()
{
    int i;
    for( i = 0; i < fDistribTab.Count(); i++ )
        fDistribTab[i]->Done();

    fDistribTab.ZeroCount();
}

BOOL plClusterComponent::IsFlexible() const
{
    int i;
    for( i = 0; i < fDistribTab.Count(); i++ )
    {
        if( fDistribTab[i]->IsFlexible() )
            return true;
    }
    return false;
}


BOOL plClusterComponent::IBuildNodeTab(plDistribInstTab& nodes, plErrorMsg* pErrMsg, plExportProgressBar& bar)
{
    plDistTree distTree;
    nodes.ZeroCount();
    int numDistrib = fDistribTab.Count();
    if( numDistrib )
    {
        int progCnt = 0;
        int i;
        for( i = 0; i < numDistrib; i++ )
            progCnt += fDistribTab[i]->NumTargets();
        if( !progCnt )
            progCnt = 1;

        bar.Start("Compiling", progCnt << 4);

        if( bar.Update(nil, 0) )
            return false;

        for( i = 0; i < numDistrib; i++ )
        {
            plDistribInstTab reps;
            if( !fDistribTab[i]->Distribute(reps, pErrMsg, bar, &distTree) )
                return false;
            if( reps.Count() )
                nodes.Append(reps.Count(), &reps[0]);
        }
    }
    return true;
}

void plClusterComponent::IClearNodeTab()
{
    int i;
    for( i = 0; i < fDistribTab.Count(); i++ )
        fDistribTab[i]->Done();
}

void plClusterComponent::Select()
{
    INodeTab nodeTab;
    int numClust = fCompPB->Count(kClusters);
    int i;
    for( i = 0; i < numClust; i++ )
    {
        INode* clust = fCompPB->GetINode(kClusters, TimeValue(0), i);
        if( clust )
        {
            nodeTab.Append(1, &clust);
        }
    }
    GetCOREInterface()->RemoveNamedSelSet(TSTR(GetINode()->GetName()));
    GetCOREInterface()->AddNewNamedSelSet(nodeTab, TSTR(GetINode()->GetName()));
}

void plClusterComponent::Clear()
{
    int numClust = fCompPB->Count(kClusters);
    if( !numClust )
        return;

    GetCOREInterface()->DisableSceneRedraw();

    plExportProgressBar bar;

    const int log2freq = 2;
    const int maskfreq = (1 << log2freq)-1;
    int totalSteps = numClust >> log2freq;
    if( !totalSteps )
        totalSteps = 1;
    bar.Start("Deleting", totalSteps);

    bar.Update(nil, 0);

    int i;
    for( i = 0; i < numClust; i++ )
    {
        plMaxNode* cluster = (plMaxNode*)fCompPB->GetINode(kClusters, TimeValue(0), i);
        if( cluster )
        {
            // HACK FISH - till we get a real fix for the slowdown caused by 
            // deleting things with a location component on them.
            int numComp = cluster->NumAttachedComponents();
            int j;
            for( j = numComp-1; j >= 0; --j )
            {
                plComponentBase* comp = cluster->GetAttachedComponent(j);
                if( comp )
                {
                    comp->DeleteTarget(cluster);
                }
            }
            // END HACK FISH

            cluster->Delete(TimeValue(0), true);
        }

        if( !(i & maskfreq) )
            bar.Update(nil);
    }

    fCompPB->ZeroCount(kClusters);
    fCompPB->ZeroCount(kFadeIns);
    fCompPB->ZeroCount(kFadeOuts);
    fCompPB->ZeroCount(kWindBones);

    GetCOREInterface()->EnableSceneRedraw();

    GetCOREInterface()->ForceCompleteRedraw(FALSE);
}

BOOL plClusterComponent::Cluster(plErrorMsg* pErrMsg)
{
    GetCOREInterface()->RedrawViews(GetCOREInterface()->GetTime(), REDRAW_BEGIN);

    Clear();

    IGetLocation();

    ICheckWindBone();

//  fClusterSize = fCompPB->GetFloat(kClusterSize);
//  fClusterSize = 75.f;

    plExportProgressBar bar;

    IBuildDistribTab();

    INodeTab doneNodes;
    plBox3Tab fade;
    INodeTab bone;
    hsBitVector boneIsParent;
    hsBitVector doneBits;

    plDistribInstTab nodes;

    BOOL failed = true;
    if( IBuildNodeTab(nodes, pErrMsg, bar) )
    {
        failed = false;

        if( nodes.Count() )
        {
            bar.Start("Optimizing", nodes.Count());
            bar.Update(nil, 0);
        }

        int i;
        for( i = 0; i < nodes.Count(); i++ )
        {
            if( doneBits.IsBitSet(i) )
                continue;

            if( !nodes[i].fNode )
                continue;

            if( !ICanCluster(nodes[i]) )
                continue;

            plDistribInstTab shared;
            shared.Append(1, &nodes[i]);
            int j;
            for( j = 0; j < nodes.Count(); j++ )
            {
                if( !doneBits.IsBitSet(j) && ICanCluster(nodes[i], nodes[j]) )
                {
                    shared.Append(1, &nodes[j]);
                    doneBits.SetBit(j);
                }
            }
            INodeTab cluster;
            failed = !IClusterGroup(shared, cluster, bar);
            if( cluster.Count() )
            {
                int j;
                for( j = 0; j < cluster.Count(); j++ )
                {
                    fade.Append(1, &shared[0].fFade);
                    bone.Append(1, &shared[0].fBone);
                    boneIsParent.SetBit(doneNodes.Count() + j, shared[0].fRigid);
                    
                    // Attach every component on the template node to the new node
                    int k;
                    plMaxNode *maxNode = (plMaxNode*)nodes[i].fNode;
                    for (k = 0; k < maxNode->NumAttachedComponents(); k++)
                    {
                        plComponentBase *comp = maxNode->GetAttachedComponent(k);
                        comp->AddTarget((plMaxNode*)cluster[j]);
                    }
                }

                doneNodes.Append(cluster.Count(), &cluster[0]);

            }
            if( failed )
                break;
        }

    }

    IClearNodeTab();

    IClearDistribTab();

    IFinishDoneNodes(doneNodes, fade, bone, boneIsParent);

    if( failed )
        Clear();
    else
        Select();

    GetCOREInterface()->RedrawViews(GetCOREInterface()->GetTime(), REDRAW_END);

    return failed;
}

void plClusterComponent::IFinishDoneNodes(INodeTab& doneNodes, plBox3Tab& fade, INodeTab& bones, hsBitVector& boneIsParent)
{
    if( !doneNodes.Count() )
        return;

    NameMaker *nn = GetCOREInterface()->NewNameMaker();

    TSTR nodeName(GetINode()->GetName());
    int i;
    for( i = 0; i < doneNodes.Count(); i++ )
    {
        if( doneNodes[i] )
        {
            nn->MakeUniqueName(nodeName);
            doneNodes[i]->SetName(nodeName);

            ISetLocation((plMaxNode*)doneNodes[i]);
        }
        Point3* p3p;
        p3p = &fade[i].pmin;
        fCompPB->Append(kFadeIns, 1, &p3p);
        p3p = &fade[i].pmax;
        fCompPB->Append(kFadeOuts, 1, &p3p);

        INode* nilNode = nil;
        if( bones[i] )
        {
            if( boneIsParent.IsBitSet(i) )
            {
        
                bones[i]->AttachChild(doneNodes[i], true);
                fCompPB->Append(kWindBones, 1, &nilNode);
            }
            else
            {
                fCompPB->Append(kWindBones, 1, &bones[i]);
            }
        }
        else
        {
            fCompPB->Append(kWindBones, 1, &nilNode);
        }
    }

    // Add doneNodes to our PB, so we can keep track of who we've created.
    fCompPB->Append(kClusters, doneNodes.Count(), &doneNodes[0]);
}

void plClusterComponent::ISetupRenderDependencies()
{
    hsRadixSort::Elem* listTrav;
    hsTArray<hsRadixSortElem> scratchList;

    int numClust = fCompPB->Count(kClusters);

    if( !numClust )
        return;

    scratchList.SetCount(numClust);

    int i;
    for( i = 0; i < numClust; i++ )
    {
        listTrav = &scratchList[i];
        listTrav->fBody = (void*)i;
        listTrav->fNext = listTrav+1;

        Point3 fadeMax = fCompPB->GetPoint3(kFadeOuts, TimeValue(0), i);
        listTrav->fKey.fFloat = fadeMax[2] > 0 ? -fadeMax[0] : -1.e33f; // Negate the distance to get decreasing sort.
    }
    listTrav->fNext = nil;

    hsRadixSort rad;
    hsRadixSort::Elem* sortedList = rad.Sort(scratchList.AcquireArray(), hsRadixSort::kFloat);

    hsRadixSort::Elem* prevStart = nil;
    hsRadixSort::Elem* prevEnd = nil;

    listTrav = sortedList;

    float currFade = listTrav->fKey.fFloat;
    listTrav = listTrav->fNext;

    while( listTrav )
    {
        if( listTrav->fKey.fFloat != currFade )
        {
            IAssignRenderDependencies(prevStart, prevEnd, sortedList, listTrav);

            currFade = listTrav->fKey.fFloat;
        }
        
        listTrav = listTrav->fNext;
    }
    IAssignRenderDependencies(prevStart, prevEnd, sortedList, listTrav);


    // Sort them by fade.Min()[2] < 0 ? fade.Min()[0] : 0 in decreasing order
    // make first sort value group render dependent on all targets
    // for each remaining sort value group
    //      make render dependent on members of previous sort value group.
}

void plClusterComponent::IAssignRenderDependencies(hsRadixSortElem*& prevStart, hsRadixSortElem*& prevEnd,
                                                   hsRadixSortElem*& currStart, hsRadixSortElem*& currEnd)
{
    if( !prevStart )
    {
        hsRadixSort::Elem* q;
        for( q = currStart; q != currEnd; q = q->fNext )
        {
            int iNode = (int)q->fBody;
            plMaxNodeBase* clust = (plMaxNodeBase*)fCompPB->GetINode(kClusters, TimeValue(0), iNode);

            if( clust )
            {
                int i;
                for( i = 0; i < NumTargets(); i++ )
                {
                    plMaxNodeBase* targ = GetTarget(i);
                    if( targ )
                        clust->AddRenderDependency(targ);
                }
            }
        }
    }
    else
    {
        hsRadixSort::Elem* q;
        for( q = currStart; q != currEnd; q = q->fNext )
        {
            int iNode = (int)q->fBody;
            plMaxNodeBase* clust = (plMaxNodeBase*)fCompPB->GetINode(kClusters, TimeValue(0), iNode);

            if( clust )
            {
#if 0
                hsRadixSort::Elem* p;
                for( p = prevStart; p != prevEnd; p = p->fNext )
                {
                    iNode = (int)p->fBody;
                    plMaxNodeBase* targ = (plMaxNodeBase*)fCompPB->GetINode(kClusters, TimeValue(0), iNode);
                    clust->AddRenderDependency(targ);
                }
#else
                iNode = (int)prevStart->fBody;
                plMaxNodeBase* targ = (plMaxNodeBase*)fCompPB->GetINode(kClusters, TimeValue(0), iNode);
                clust->AddRenderDependency(targ);
#endif
            }
        }
    }
    prevStart = currStart;
    prevEnd = currEnd;
    currStart = currEnd;
}

BOOL plClusterComponent::ICanCluster(plDistribInstance& node)
{
    if( !node.fNode )
        return false;

    return true;
}

BOOL plClusterComponent::ICanCluster(plDistribInstance& node0, plDistribInstance& node1)
{
    if( !(node0.fNode && node1.fNode) )
        return false;

    if( !ICanCluster(node1) )
        return false;

    if( node0.fNode->GetMtl() != node1.fNode->GetMtl() )
        return false;

    if( (node0.fFade.Min() != node1.fFade.Min())
        ||(node0.fFade.Max() != node1.fFade.Max()) )
        return false;

    if( node0.fBone != node1.fBone )
        return false;

    return true;
}

Box3 plClusterComponent::IPartition(plDistribInstTab& nodes)
{
    if( !nodes.Count() )
        return Box3();
    
    Box3 retVal;
    int i;
    for( i = 0; i < nodes.Count(); i++ )
    {
        retVal += nodes[i].fNodeTM.GetTrans();
    }
    Point3 mins = retVal.Min();
    Point3 maxs = retVal.Max();

//  mins += Point3(fClusterSize, fClusterSize, fClusterSize) * 0.5f;
//  maxs -= Point3(fClusterSize, fClusterSize, fClusterSize) * 1.5f;
//  maxs -= Point3(fClusterSize, fClusterSize, fClusterSize) * 1.0f;

    for( i = 0; i < 3; i++ )
    {
        if( mins[i] >= maxs[i] )
        {
            float mid = (mins[i] + maxs[i]) * 0.5f;
            mins[i] = mid - 1.f;
            maxs[i] = mid + 1.f;
        }
    }
    retVal = Box3(mins, maxs);

    return retVal;
}

void plClusterComponent::IClusterBins(plDistribInstTab& nodes, Box3& box)
{
    int i;
    for( i = 0; i < 3; i++ )
    {
        fSizes[i] = int((box.Max()[i] - box.Min()[i]) / fClusterSize);
        if( !fSizes[i] )
            fSizes[i] = 1;
    }

    int totSize = IGetBinCount();
    fClusterBins = TRACKED_NEW plDistribInstTab*[totSize];

    memset(fClusterBins, 0, sizeof(*fClusterBins) * totSize);

    for( i = 0; i < nodes.Count(); i++ )
    {
        Matrix3 l2w = nodes[i].fNodeTM;
        Point3 loc = l2w.GetTrans();

        plDistribInstTab* bin = IGetClusterBin(box, loc);
        bin->Append(1, &nodes[i]);
    }
}

int plClusterComponent::IGetBinCount()
{
    return fSizes[0] * fSizes[1] * fSizes[2];
}

void plClusterComponent::IDeleteClusterBins()
{
    int totSize = IGetBinCount();
    int i;
    for( i = 0; i < totSize; i++ )
        delete fClusterBins[i];
    delete [] fClusterBins;
    fClusterBins = nil;
}

plDistribInstTab* plClusterComponent::IGetClusterBin(const Box3& box, const Point3& loc)
{
    int coord[3];
    int j;
    for( j = 0; j < 3; j++ )
    {
        coord[j] = int((loc[j] - box.Min()[j]) / fClusterSize);
        if( coord[j] < 0 )
            coord[j] = 0;
        else if( coord[j] >= fSizes[j] )
            coord[j] = fSizes[j] - 1;
    }
    int idx = coord[0] * fSizes[1] * fSizes[2] + coord[1] * fSizes[2] + coord[2];
    if( !fClusterBins[idx] )
        fClusterBins[idx] = TRACKED_NEW plDistribInstTab;
    return fClusterBins[idx];
}

BOOL plClusterComponent::IClusterGroup(plDistribInstTab& nodes, INodeTab& clusters, plExportProgressBar& bar)
{
    BOOL retVal = true;

    hsBitVector doneNodes;

    const float kNoOptClusterSize = 100.f;
    const float kOptClusterSize = 100.f; // 30.f?
    const int kNoOptMaxFaces = 10000;
    const int kOptMaxFaces = 200;

    float optim = fCompPB->GetFloat(kOptimization) * 0.01f;

    float minClusterSize = kNoOptClusterSize + optim * (kOptClusterSize - kNoOptClusterSize);
    int maxFaces = kNoOptMaxFaces + int(optim * float(kOptMaxFaces - kNoOptMaxFaces));

    fClusterSize = minClusterSize;
    Box3 fade = nodes[0].fFade;
    if( fade.Min().z < 0 )
    {
        fClusterSize = fade.Min().x;
    }
    else if( fade.Max().z < 0 )
    {
        fClusterSize = fade.Max().x;
    }
    if( fClusterSize < minClusterSize )
        fClusterSize = minClusterSize;

    Box3 box = IPartition(nodes);

    IClusterBins(nodes, box);

    int totSize = IGetBinCount();
    int i;
    for( i = 0; i < totSize; i++ )
    {
        if( fClusterBins[i] )
        {
            INode* grp = IMakeOne(*fClusterBins[i]);
            if( grp )
            {
                INodeTab subGrp;
                plDicer dicer;
                dicer.SetMaxFaces(maxFaces);
                dicer.Dice(grp, subGrp);
                int j;
                for( j = 0; j < subGrp.Count(); j++ )
                {
                    clusters.Append(1, &subGrp[j]);
                }
            }

            if( bar.Update(nil, fClusterBins[i]->Count()) )
            {
                retVal = false;
                break;
            }
        }
    }
    IDeleteClusterBins();

    return retVal;
}

INode* plClusterComponent::IMakeOne(plDistribInstTab& nodes)
{
    if( !nodes.Count() )
        return nil;

    TriObject* triObj = CreateNewTriObject();
    Mesh* outMesh = &triObj->mesh;

    *outMesh = *nodes[0].fMesh;

    INode *outNode = GetCOREInterface()->CreateObjectNode(triObj);

    Matrix3 l2w = nodes[0].fObjectTM;
    Matrix3 w2l = Inverse(l2w);

    MeshDelta meshDelta(*outMesh);

    int i;
    for( i = 1; i < nodes.Count(); i++ )
    {
        Mesh nextMesh(*nodes[i].fMesh);

        Matrix3 relativeTransform = nodes[i].fObjectTM * w2l;

        // If we've stashed normals on this mesh, they are in the mesh's
        // native local space. The transform of the positions is handled
        // automatically by meshDelta.AttachMesh (hence passing in the matrix),
        // but the meshDelta hasn't a clue that the normal map channel isn't
        // just more UVs. No problem, I'll handle it myself.
        if( nextMesh.mapVerts(plDistributor::kNormMapChan) )
        {
            Point3* norms = nextMesh.mapVerts(plDistributor::kNormMapChan);
            int k;
            for( k = 0; k < nextMesh.getNumMapVerts(plDistributor::kNormMapChan); k++ )
            {
                norms[k] = relativeTransform.VectorTransform(norms[k]);
            }
        }

        IRandomizeSkinWeights(&nextMesh, nodes[i].fFlex);

        meshDelta.AttachMesh(*outMesh, nextMesh, relativeTransform, 0);

        meshDelta.Apply(*outMesh);

    }

    outNode->SetNodeTM(TimeValue(0), l2w);
    outNode->CopyProperties(nodes[0].fNode);
    outNode->SetMtl(nodes[0].fNode->GetMtl());
    outNode->SetObjOffsetPos(Point3(0,0,0));
    Quat identQuat;
    identQuat.Identity();
    outNode->SetObjOffsetRot(identQuat);
    outNode->SetObjOffsetScale(ScaleValue(Point3(1.f, 1.f, 1.f)));

    outNode->Hide(false);

    return outNode;
}

BOOL plClusterComponent::IGetLocation()
{
    fLocationComp = nil;
    int numTarg = NumTargets();
    int i;
    for( i = 0; i < numTarg; i++ )
    {
        plMaxNodeBase* targ = GetTarget(i);
        if( targ )
        {
            UInt32 numComp = targ->NumAttachedComponents(false);
            int j;
            for( j = 0; j < numComp; j++ )
            {
                plComponentBase* comp = targ->GetAttachedComponent(j, false);
                if( comp && (comp->ClassID() == ROOM_CID || comp->ClassID() == PAGEINFO_CID) )
                {
                    if( fLocationComp && (fLocationComp != comp) )
                    {
                        fLocationComp = nil;
                        return false;
                    }
                    fLocationComp = comp;
                }
            }
        }
    }
    return fLocationComp != nil;
}

void plClusterComponent::ISetLocation(plMaxNode* node)
{
    if( fLocationComp )
        fLocationComp->AddTarget(node);
}

void plClusterComponent::IRandomizeSkinWeights(Mesh* mesh, const Point3& flex) const
{
    const int iWgtMap = plDistributor::kWgtMapChan;

    UVVert *wgtMap = mesh->mapVerts(iWgtMap);   
    int numWgtVerts = mesh->getNumMapVerts(iWgtMap);

    static plRandom random;

    float interMeshRandomNess = flex[1];
    float intraMeshRandomNess = flex[2];

    float r = interMeshRandomNess > 0 ? random.RandRangeF(1.f - interMeshRandomNess, 1.f) : 1.f;
    int i;
    for( i = 0; i < numWgtVerts; i++ )
    {
        UVVert uvw = wgtMap[i];
        float s = r;
        if( intraMeshRandomNess > 0 )
            s *= random.RandRangeF(1.f - intraMeshRandomNess, 1.f);
        uvw *= s;
        mesh->setMapVert(iWgtMap, i, uvw);
    }
}