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

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*==LICENSE==*/

#include "HeadSpin.h"
#include "hsWindows.h"

#include <max.h>
#include <meshdlib.h>
#pragma hdrstop

#include "plDicer.h"

static const int kDefFaces = 200;
static const float kDefSize = 1000.f;

plDicer::plDicer()
:   fMaxSize(kDefSize, kDefSize, kDefSize),
    fMaxFaces(kDefFaces)
{
    
}

plDicer::~plDicer()
{
}

void plDicer::SetMaxSize(const Point3& size)
{
    fMaxSize = size;
}

Point3 plDicer::GetMaxSize() const
{
    return fMaxSize;
}

void plDicer::SetMaxFaces(int n)
{
    fMaxFaces = n;
}

int plDicer::GetMaxFaces() const
{
    return fMaxFaces;
}

BOOL plDicer::Dice(INode* node, INodeTab& out)
{
    Object *obj = node->EvalWorldState(TimeValue(0)).obj;
    if( !obj )
    {
        out.Append(1, &node);
        return false;
    }

    if( !obj->CanConvertToType( triObjectClassID ) )
    {
        out.Append(1, &node);
        return false;
    }

    // Convert to triMesh object
    TriObject   *meshObj = (TriObject*)obj->ConvertToType(TimeValue(0), triObjectClassID);
    if( !meshObj )
    {
        out.Append(1, &node);
        return false;
    }

    TriObject* newObj = CreateNewTriObject();
    newObj->mesh = meshObj->mesh;

    plTriObjectTab triList;
    if( !IDiceIter(newObj, triList) )
    {
        delete newObj;
        out.Append(1, &node);
        return false;
    }

    IMakeIntoNodes(node, triList, out);
    
    node->Delete(TimeValue(0), true);

    return true;
}

BOOL plDicer::IDetach(TriObject* triObj, BitArray& faces, plTriObjectTab& triList)
{
    TriObject* newObj = CreateNewTriObject();
    Mesh* newMesh = &newObj->mesh;

    MeshDelta meshDelta(triObj->mesh);

    // meshDelta.Detach(Mesh & m, Mesh *out, BitArray fset, BOOL faces, BOOL del, BOOL elem);
    meshDelta.Detach(triObj->mesh, newMesh, faces, true, true, false);

    meshDelta.Apply(triObj->mesh);

    if( newObj->mesh.getNumFaces() )
        triList.Append(1, &newObj);
    else
        delete newObj;

    if( triObj->mesh.getNumFaces() )
    {
        newObj = CreateNewTriObject();
        newObj->mesh = triObj->mesh;
        triList.Append(1, &newObj);
    }

    delete triObj;

    return true;
}

BOOL plDicer::IHalf(TriObject* triObj, plTriObjectTab& triList)
{
    Mesh& mesh = triObj->mesh;
    BitArray faces(mesh.getNumFaces());

    int iAxis = 0;
    float maxDim = mesh.getBoundingBox().Width()[0];
    if( mesh.getBoundingBox().Width()[1] > maxDim )
    {
        maxDim = mesh.getBoundingBox().Width()[1];
        iAxis = 1;
    }
    if( mesh.getBoundingBox().Width()[2] > maxDim )
    {
        maxDim = mesh.getBoundingBox().Width()[2];
        iAxis = 2;
    }
    float middle = mesh.getBoundingBox().Center()[iAxis];

    int numHi = 0;
    int i;
    for( i = 0; i < mesh.getNumFaces(); i++ )
    {
        Point3 p[3];
        p[0] = mesh.getVert(mesh.faces[i].getVert(0));
        p[1] = mesh.getVert(mesh.faces[i].getVert(1));
        p[2] = mesh.getVert(mesh.faces[i].getVert(2));

        if( (p[0][iAxis] > middle)
            &&(p[1][iAxis] > middle)
            &&(p[2][iAxis] > middle) )
        {
            numHi++;
            faces.Set(i);
        }
    }
    if( !numHi || (numHi == mesh.getNumFaces()) )
        return false;

    return IDetach(triObj, faces, triList);
}

BOOL plDicer::IDice(TriObject* triObj, plTriObjectTab& triList)
{
    int oneBigger = -1;
    int oneSmaller = -1;
    BOOL doChop = false;
    // First, does he need chopping?
    Mesh& mesh = triObj->mesh;
    if( mesh.getNumFaces() > GetMaxFaces() )
    {
        doChop = true;
    }
    else
    {
        Box3 bnd = mesh.getBoundingBox();
        Point3 wid = bnd.Width();
        
        if( wid.x > GetMaxSize().x )
            doChop = true;
        if( wid.y > GetMaxSize().y )
            doChop = true;
        if( wid.z > GetMaxSize().z )
            doChop = true;
    }

    if( !doChop )
        return false;

    // Okay, we got to chop.
    return IHalf(triObj, triList);
}

BOOL plDicer::IDiceIter(TriObject* triObj, plTriObjectTab& triList)
{
    triList.ZeroCount();

    plTriObjectTab inList;
    plTriObjectTab cutList;
    
    inList.Append(1, &triObj);

    while( inList.Count() )
    {
        int i;
        for( i = 0; i < inList.Count(); i++ )
        {
            if( !IDice(inList[i], cutList) )
            {
                triList.Append(1, &inList[i]);
            }
        }
        inList = cutList;
        cutList.ZeroCount();
    }

    return triList.Count() > 0;
}

BOOL plDicer::IMakeIntoNodes(INode* node, plTriObjectTab& triList, INodeTab& out)
{
    NameMaker *nn = GetCOREInterface()->NewNameMaker();
    TSTR nodeName(node->GetName());

    int i;
    for( i = 0; i < triList.Count(); i++ )
    {
        INode* outNode = GetCOREInterface()->CreateObjectNode(triList[i]);

        outNode->SetNodeTM(TimeValue(0), node->GetNodeTM(TimeValue(0)));
        outNode->CopyProperties(node);
        outNode->SetMtl(node->GetMtl());
        outNode->SetObjOffsetPos(node->GetObjOffsetPos());
        outNode->SetObjOffsetRot(node->GetObjOffsetRot());
        outNode->SetObjOffsetScale(node->GetObjOffsetScale());

        nn->MakeUniqueName(nodeName);
        outNode->SetName(nodeName);

        out.Append(1, &outNode);
    }
    return true;
}