source: OGRE/trunk/ogrenew/Tools/LightwaveConverter/src/lwo2mesh.cpp @ 657

#include "Vector3.h"
#include "lwo2mesh.h"
#include "Ogre.h"
#include "OgreMesh.h"
#include "OgreStringConverter.h"
#include "OgreDefaultHardwareBufferManager.h"

#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX
#include <math.h>
#include <float.h>  // FLT_MIN, FLT_MAX
#include <libgen.h> // dirname(), basename().
#include <string.h> // strtok();
#include <string>   // string class
#endif

#define POLYLIMIT 0x5555
#define POINTLIMIT 0x5555

extern Mesh::LodDistanceList distanceList;
extern Real reduction;
extern bool flags[NUMFLAGS];
extern MaterialSerializer* materialSerializer;
extern char *matPrefix;

extern ostream& nl(ostream& os);

#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX

/* We expect the caller to provide an arrays of chars for the output. */
void _splitpath( const char *_fn, char *_drive, char *_dir, char *_node, char *_ext ) {
       
   /* A crazy mix of both c and c++.. */
       
   const char *delimiters = ".";
   char buf[ _MAX_DRIVE+_MAX_DIR+_MAX_FNAME+_MAX_EXT + 5 ];
   char *exte, *ddir, *fnam, *_ext_tmp;

   strcpy( buf, _fn );
   strcpy( _drive, "" ); // _drive is always empth on linux.

   if ( String( buf ).empty() ) {
       strcpy( _node, "" );
       strcpy( _dir, "" );
       strcpy( _ext, "" );
       return;
   } 
   
   fnam = basename( buf );
   strcpy( _node, fnam );
   ddir = dirname( buf );
   strcpy( _dir, ddir );
   
   _ext_tmp = strtok( fnam, delimiters );
   while ( ( _ext_tmp = strtok( NULL, delimiters ) ) != NULL ) exte = _ext_tmp;
   strcpy( _ext, exte );

   _node[ strlen(_node) - strlen(_ext) - 1 ] = '\0';

}

/* We expect the caller to provide an array of chars for the output. */
void _makepath( char *_fn, const char *_drive, const char *_dir,
       const char *_node, const char *_ext ) {
   
   /* A crazy mix of both c and c++.. */

   std::string buf("");

   if ( _drive != NULL ) // On Linux, this is usually empty.
       buf += _drive;
       
   if ( _dir != NULL ) { // The directory part.
       if ( std::string(_dir).empty() )
           buf += ".";
       buf += _dir;
       buf += "/";
   }
   
   if ( _node != NULL ) // The filename without the extension.
       buf += _node;
   
   if ( _ext != NULL ) { // The extension.
       if ( std::string( _ext ).compare( 0, 1, "." ) != 0 )
           buf += ".";
       buf += _ext;
   }

   strcpy( _fn, buf.c_str() );
}

#endif

void Lwo2MeshWriter::doExportMaterials()
{
        char
                drive[ _MAX_DRIVE ],
                dir[ _MAX_DIR ],
                node[ _MAX_FNAME ],
                ext[ _MAX_EXT ],
                texname [128];

        unsigned int slength = 0;

        if (flags[RenameMaterials])
        {
                if (flags[UseInteractiveMethod])
                {
                        for (unsigned int i = 0; i < object->surfaces.size(); ++i)
                        {               
                                lwSurface *surface = object->surfaces[i];
                                cout << "Rename surface " << surface->name << " to: ";
                                cin >> texname;
                                surface->setname(texname);
                        }
                } else {
                        _splitpath( dest, drive, dir, node, ext );

                        for (unsigned int i = 0; i < object->surfaces.size(); ++i)
                        {
                                lwSurface *surface = object->surfaces[i];
                                if (flags[UsePrefixMethod])
                                        strcpy(texname,matPrefix);
                                else
                                {
                                        strcpy(texname,node);
                                        strcat(texname,"_");
                                }

                                strcat(texname, surface->name);
                                surface->setname(texname);
                        }
                }
        }

        for (unsigned int i = 0; i < object->surfaces.size(); ++i)
        {               
                lwSurface *surface = object->surfaces[i];

                // Create deferred material so no load
                MaterialPtr ogreMat = MaterialManager::getSingleton().getByName(surface->name);
                
                if (!ogreMat)
                {
                        ogreMat = MaterialManager::getSingleton().create(surface->name, 
                ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                        
                        ogreMat->setAmbient
                        (
                                surface->color.rgb[0],
                                surface->color.rgb[1],
                                surface->color.rgb[2]
                        );
                        
                        ogreMat->setDiffuse
                        (
                                surface->diffuse.val * surface->color.rgb[0],
                                surface->diffuse.val * surface->color.rgb[1],
                                surface->diffuse.val * surface->color.rgb[2],
                                1.0f
                        );
                        
                        ogreMat->setSpecular
                        (
                                surface->specularity.val * surface->color.rgb[0],
                                surface->specularity.val * surface->color.rgb[1],
                                surface->specularity.val * surface->color.rgb[2],
                                1.0f
                        );
                        
                        ogreMat->setShininess(surface->glossiness.val);
                        
                        ogreMat->setSelfIllumination
                        (
                                surface->luminosity.val * surface->color.rgb[0],
                                surface->luminosity.val * surface->color.rgb[1],
                                surface->luminosity.val * surface->color.rgb[2]
                        );
                        
                        for (unsigned int j = 0; j < surface->color.textures.size(); j++)
                        {
                                lwTexture *tex = surface->color.textures[j];
                                int cindex = tex->param.imap->cindex;
                                lwClip *clip = object->lwFindClip(cindex);
                                
                                if (clip)
                                {
                                        _splitpath( clip->source.still->name, drive, dir, node, ext );
                                        _makepath( texname, 0, 0, node, ext );                                  
                                        ogreMat->getTechnique(0)->getPass(0)->createTextureUnitState(texname);
                                }
                        }                       
                        materialSerializer->queueForExport(ogreMat);
                }
        }
}

Skeleton *Lwo2MeshWriter::doExportSkeleton(const String &skelName, int l)
{
        vpolygons bones;
        bones.clear();
        bones.reserve(256);

        vpoints bonepoints;
        bonepoints.clear();
        bonepoints.reserve(512);

        if (l == -1)
        {
                for (l = 0; l < object->layers.size(); ++l)
                {
                        copyPoints(-1, ID_BONE, object->layers[l]->points, bonepoints);
                        copyPolygons(-1, ID_BONE, object->layers[l]->polygons, bones);
                }
        }
        else
        {
                copyPoints(-1, ID_BONE, object->layers[l]->points, bonepoints);
                copyPolygons(-1, ID_BONE, object->layers[l]->polygons, bones);
        }

        if (!bones.size()) return NULL; // no bones means no skeleton

        Skeleton *ogreskel = new Skeleton(skelName);

        unsigned int i;
        // Create all the bones in turn
        for (i = 0; i < bones.size(); ++i)
        {
                lwPolygon* bone = bones[i];
                if (bone->vertices.size() != 2) continue; // a bone has only 2 sides

                Bone* ogreBone = ogreskel->createBone("Bone");

                Ogre::Vector3 bonePos(bone->vertices[0]->point->x, bone->vertices[0]->point->y, bone->vertices[0]->point->z);

                ogreBone->setPosition(bonePos);
                // Hmm, Milkshape has chosen a Euler angle representation of orientation which is not smart
                // Rotation Matrix or Quaternion would have been the smarter choice
                // Might we have Gimbal lock here? What order are these 3 angles supposed to be applied?
                // Grr, we'll try our best anyway...
                Quaternion qx, qy, qz, qfinal;
/*
                qx.FromAngleAxis(msBoneRot[0], Vector3::UNIT_X);
                qy.FromAngleAxis(msBoneRot[1], Vector3::UNIT_Y);
                qz.FromAngleAxis(msBoneRot[2], Vector3::UNIT_Z);
*/
                // Assume rotate by x then y then z
                qfinal = qz * qy * qx;
                ogreBone->setOrientation(qfinal);
        }
/*
        for (i = 0; i < numBones; ++i)
        {
                msBone* bone = msModel_GetBoneAt(pModel, i);

                if (strlen(bone->szParentName) == 0)
                {
                }
                else
                {
                        Bone* ogrechild = ogreskel->getBone(bone->szName);
                        Bone* ogreparent = ogreskel->getBone(bone->szParentName);

                        if (ogrechild == 0)
                        {
                                continue;
                        }
                        if (ogreparent == 0)
                        {
                                continue;
                        }
                        // Make child
                        ogreparent->addChild(ogrechild);
                }


        }

        // Create the Animation(s)
        doExportAnimations(pModel, ogreskel);

        // Create skeleton serializer & export
        SkeletonSerializer serializer;
        serializer.exportSkeleton(ogreskel, szFile);

        ogreMesh->_notifySkeleton(ogreskel);

        return ogreskel;
*/
        delete ogreskel;
        return NULL;
}

#define POSITION_BINDING 0
#define NORMAL_BINDING 1
#define TEXCOORD_BINDING 2

VertexData *Lwo2MeshWriter::setupVertexData(unsigned short vertexCount, VertexData *oldVertexData, bool deleteOldVertexData)
{
        VertexData *vertexData = new VertexData();

        if (oldVertexData)
        {
        // Basic vertex info
        vertexData->vertexStart = oldVertexData->vertexStart;
                vertexData->vertexCount = oldVertexData->vertexCount + vertexCount;

                const VertexBufferBinding::VertexBufferBindingMap bindings = oldVertexData->vertexBufferBinding->getBindings();
                VertexBufferBinding::VertexBufferBindingMap::const_iterator vbi, vbend;
                vbend = bindings.end();

                for (vbi = bindings.begin(); vbi != vbend; ++vbi)
                {
                        HardwareVertexBufferSharedPtr srcbuf = vbi->second;
                        // create new buffer with the same settings
                        HardwareVertexBufferSharedPtr dstBuf = 
                                HardwareBufferManager::getSingleton().createVertexBuffer(
                                        srcbuf->getVertexSize(), srcbuf->getNumVertices() + vertexCount, srcbuf->getUsage(), srcbuf->isSystemMemory());

                        // copy data
                        dstBuf->copyData(*srcbuf, 0, 0, srcbuf->getSizeInBytes(), true);

                        // Copy binding
                        vertexData->vertexBufferBinding->setBinding(vbi->first, dstBuf);
                }

        // Copy elements
        const VertexDeclaration::VertexElementList elems = oldVertexData->vertexDeclaration->getElements();
        VertexDeclaration::VertexElementList::const_iterator ei, eiend;
        eiend = elems.end();
        for (ei = elems.begin(); ei != eiend; ++ei)
        {
            vertexData->vertexDeclaration->addElement(
                ei->getSource(),
                ei->getOffset(),
                ei->getType(),
                ei->getSemantic(),
                ei->getIndex() );
        }
                if (deleteOldVertexData) delete oldVertexData;
        }
        else
        {
                vertexData->vertexCount = vertexCount;
                
                VertexBufferBinding* bind = vertexData->vertexBufferBinding;
                VertexDeclaration* decl = vertexData->vertexDeclaration;
                
                decl->addElement(POSITION_BINDING, 0, VET_FLOAT3, VES_POSITION);
                HardwareVertexBufferSharedPtr pbuf = HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(POSITION_BINDING), vertexData->vertexCount, HardwareBuffer::HBU_DYNAMIC, false);
                bind->setBinding(POSITION_BINDING, pbuf);
                
                decl->addElement(NORMAL_BINDING, 0, VET_FLOAT3, VES_NORMAL);
                HardwareVertexBufferSharedPtr nbuf = HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(NORMAL_BINDING), vertexData->vertexCount, HardwareBuffer::HBU_DYNAMIC, false);
                bind->setBinding(NORMAL_BINDING, nbuf);
                
                decl->addElement(TEXCOORD_BINDING, 0, VET_FLOAT2, VES_TEXTURE_COORDINATES);
                HardwareVertexBufferSharedPtr tbuf = HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(TEXCOORD_BINDING), vertexData->vertexCount, HardwareBuffer::HBU_DYNAMIC, false);
                bind->setBinding(TEXCOORD_BINDING, tbuf);
        }       
        return vertexData;
}

void Lwo2MeshWriter::copyPoints(int surfaceIndex, unsigned long polygontype, vpoints &sourcepoints, vpoints &destpoints)
{
        for (unsigned int i = 0; i < sourcepoints.size(); i++)
        {
                lwPoint *point = sourcepoints[i];
                
                for (unsigned int j = 0; j < point->polygons.size(); j++)
                {
                        lwPolygon *polygon = point->polygons[j];
                        if (polygon->type == polygontype)
                                if (surfaceIndex == -1 || surfaceIndex == polygon->surfidx)
                                {
                                        destpoints.push_back(point);
                                        break;
                                }
                }
        }
}

void Lwo2MeshWriter::copyPolygons(int surfaceIndex, unsigned long polygontype, vpolygons &sourcepolygons, vpolygons &destpolygons)
{
        for (unsigned int i = 0; i < sourcepolygons.size(); i++)
        {
                lwPolygon *polygon = sourcepolygons[i];
                if (polygon->type == polygontype)
                        if (surfaceIndex == -1 || surfaceIndex == polygon->surfidx)
                                destpolygons.push_back(polygon);
        }
}

void Lwo2MeshWriter::copyDataToVertexData(vpoints &points,
                                                                                vpolygons &polygons,
                                                                                vvmaps &vmaps,
                                                                                IndexData *indexData,
                                                                                VertexData *vertexData,
                                                                                unsigned short vertexDataOffset)
{
        lwVMap *vmap = 0;
        unsigned int ni;
        
        HardwareVertexBufferSharedPtr pbuf = vertexData->vertexBufferBinding->getBuffer(POSITION_BINDING);
        HardwareVertexBufferSharedPtr nbuf = vertexData->vertexBufferBinding->getBuffer(NORMAL_BINDING);
        HardwareVertexBufferSharedPtr tbuf = vertexData->vertexBufferBinding->getBuffer(TEXCOORD_BINDING);
        HardwareIndexBufferSharedPtr ibuf = indexData->indexBuffer;

        float* pPos = static_cast<float*>(pbuf->lock(HardwareBuffer::HBL_DISCARD));
        float* pNor = static_cast<float*>(nbuf->lock(HardwareBuffer::HBL_DISCARD));
        float* pTex = static_cast<float*>(tbuf->lock(HardwareBuffer::HBL_DISCARD));
        unsigned short *pIdx = static_cast<unsigned short*>(ibuf->lock(HardwareBuffer::HBL_DISCARD));

        for (unsigned int p = 0; p < polygons.size(); p++)
        {
                lwPolygon *polygon = polygons[p];
                
                if (polygon->vertices.size() != 3) continue; // only copy triangles;

                for (unsigned int v = 0; v < polygon->vertices.size(); v++)
                {
                        lwVertex *vertex = polygon->vertices[v];
                        lwPoint *point = vertex->point;
                        unsigned short i = getPointIndex(point, points);

                        pIdx[p*3 + v] = vertexDataOffset + i;
                        
                        ni = (vertexDataOffset + i) * 3;
                        
                        pPos[ni] = vertex->point->x;
                        pPos[ni + 1] = vertex->point->y;
                        pPos[ni + 2] = vertex->point->z;
                        
                        pNor[ni] = vertex->normal.x;
                        pNor[ni + 1] = vertex->normal.y;
                        pNor[ni + 2] = vertex->normal.z;
                        
                        bool found = false;
                        
                        ni = (vertexDataOffset + i) * 2;
                        
                        for (unsigned int v = 0; v < point->vmaps.size(); v++)
                        {
                                for (unsigned int vr = 0; vr < vmaps.size(); vr++)
                                {
                                        vmap = vmaps[vr];
                                        if (point->vmaps[v].vmap == vmap)
                                        {
                                                int n = point->vmaps[v].index;
                                                
                                                pTex[ni] = vmap->val[n][0];
                                                pTex[ni + 1] = 1.0f - vmap->val[n][1];
                                                found = true;
                                                break;
                                        }
                                }
                                if (found) break;
                        }
                }
        }
    pbuf->unlock();
    nbuf->unlock();
    tbuf->unlock();
        ibuf->unlock();
}

void Lwo2MeshWriter::prepLwObject(void)
{
        unsigned int l, p;
        
        for (l = 0; l < object->layers.size(); l++)
        {
                lwLayer *layer = object->layers[l];
                
#ifdef _DEBUG
                cout << "Triangulating layer " << l << ", Polygons before: " << layer->polygons.size();
#endif
                layer->triangulatePolygons();
#ifdef _DEBUG
                cout << ", Polygons after: " << layer->polygons.size() << endl;
#endif
                
                // Mirror x-coord for Ogre;
                for (p = 0; p < layer->points.size(); p++)
                {
                        layer->points[p]->x *= -1.0f;
                        layer->points[p]->polygons.clear();
                }
                // Unscrew the bounding box
                float x = layer->bboxmin.x * -1.0f;
                layer->bboxmin.x = layer->bboxmax.x * -1.0f;
                layer->bboxmax.x = x;
                
                for ( p = 0; p < layer->polygons.size(); p++ )
                {
                        lwPolygon *polygon = layer->polygons[ p ];
                        for (unsigned int j = 0; j < polygon->vertices.size(); j++ )
                                polygon->vertices[ j ]->point->polygons.push_back(polygon);
                }       
                
                for (p = 0; p < layer->polygons.size(); p++)
                        layer->polygons[p]->flip();
                
                layer->calculatePolygonNormals();
                layer->calculateVertexNormals();
        }
}

inline int Lwo2MeshWriter::getPointIndex(lwPoint *point, vpoints &points)
{
        for (unsigned int i = 0; i < points.size(); ++i)
                if (points[i] == point) return i;
                
        return -1;
}

inline String Lwo2MeshWriter::makeLayerFileName(char* dest, unsigned int l, char *layername)
{
        char
                drive[ _MAX_DRIVE ],
                dir[ _MAX_DIR ],
                node[ _MAX_FNAME ],
                ext[ _MAX_EXT ],
                buf[ _MAX_DRIVE + _MAX_DIR + _MAX_FNAME + _MAX_EXT + 5 ];

        String LayerFileName;
        String TempName;

        _splitpath( dest, drive, dir, node, ext );

        TempName = String( node );
   
        if (layername) {
                TempName += ".";
                TempName += layername;
        } else {
                TempName += ".layer" + StringConverter::toString(l);
        }

        _makepath( buf, drive, dir, TempName.c_str(), ext );
        LayerFileName = String( buf );

        return LayerFileName;
}

inline String Lwo2MeshWriter::makeMaterialFileName(char* dest)
{
        char
                drive[ _MAX_DRIVE ],
                dir[ _MAX_DIR ],
                node[ _MAX_FNAME ],
                ext[ _MAX_EXT ],
                buf[ _MAX_DRIVE + _MAX_DIR + _MAX_FNAME + _MAX_EXT + 5 ];

        String MaterialFileName;

        _splitpath( dest, drive, dir, node, ext );
        _makepath( buf, drive, dir, node, ".material" );
 
        const char *test = MaterialFileName.c_str();
        MaterialFileName = String( buf );

        return MaterialFileName;
}

inline void Lwo2MeshWriter::getTextureVMaps(vtextures &textures, vvmaps &svmaps, vvmaps &dvmaps)
{
        for (unsigned int i = 0; i < textures.size(); i++)
        {
                lwTexture *texture = textures[i];
                
                if (texture->type == ID_IMAP && texture->param.imap)
                {
                        char *mapname = texture->param.imap->vmap_name;
                        if (mapname)
                                for (unsigned int v = 0; v < svmaps.size(); v++)
                                {
                                        lwVMap *vmap = svmaps[v];
                                        if (strcmp(mapname, vmap->name) == 0) dvmaps.push_back(vmap);
                                }
                }
        }
        return;
}

bool Lwo2MeshWriter::writeLwo2Mesh(lwObject *nobject, char *ndest)
{
        object = nobject;
        dest = ndest;
        
        if (!object) return false;
        if (!object->layers.size()) return false;
        
        LogManager::getSingleton().createLog("Lwo2MeshWriter.log");
        
        prepLwObject();
        
        vpoints points;
        vpolygons polygons;
        vvmaps vmaps;
        
        MeshSerializer meshserializer;

        if (flags[ExportMaterials])
        {
                doExportMaterials();
                materialSerializer->exportQueued(makeMaterialFileName(dest));
        }

        unsigned int ml = object->layers.size();

        bool SeparateLayers = flags[UseSeparateLayers] && ml > 1;

        if (!SeparateLayers) ogreMesh = new Mesh(ndest);

        Ogre::Vector3 boundingBoxMin(FLT_MAX, FLT_MAX, FLT_MAX);
        Ogre::Vector3 boundingBoxMax(FLT_MIN, FLT_MIN, FLT_MIN);


        for( unsigned int ol = 0; ol < ml; ++ol )
        {
                if (!object->layers[ol]->polygons.size())
                        continue;

                Ogre::Vector3 currentMin(object->layers[ol]->bboxmin.x,
                                                                 object->layers[ol]->bboxmin.y,
                                                                 object->layers[ol]->bboxmin.z);
                Ogre::Vector3 currentMax(object->layers[ol]->bboxmax.x,
                                                                 object->layers[ol]->bboxmax.y,
                                                                 object->layers[ol]->bboxmax.z);

                if (SeparateLayers)
                {       
                        ogreMesh = new Mesh(ndest);
                        ogreMesh->_setBounds(Ogre::AxisAlignedBox(currentMin, currentMax));
                        ogreMesh->_setBoundingSphereRadius(Ogre::Math::Sqrt(std::max(currentMin.squaredLength(), currentMax.squaredLength())));
                }
                else
                {
                        boundingBoxMin.makeFloor(currentMin);
                        boundingBoxMax.makeCeil(currentMax);
                }
                
                for (unsigned int s = 0; s < object->surfaces.size(); s++)
                {
                        lwSurface *surface = object->surfaces[s];
                        
                        points.clear();
                        polygons.clear();
                        vmaps.clear();
                        
                        unsigned int l = ol;

                        for( unsigned int il = 0; il < ml; ++il )
                        {
                                if (!SeparateLayers) l = il;

                                copyPoints(s, ID_FACE, object->layers[l]->points, points);
                                copyPolygons(s, ID_FACE, object->layers[l]->polygons, polygons);
                                getTextureVMaps(surface->color.textures, object->layers[l]->vmaps, vmaps);

                                if (SeparateLayers) break;
                        }

                        if (!polygons.size()) continue;                         
                        
                        SubMesh *ogreSubMesh = ogreMesh->createSubMesh();
                        ogreSubMesh->useSharedVertices = flags[UseSharedVertexData] && points.size() < POINTLIMIT;

                        ogreSubMesh->indexData->indexCount = polygons.size() * 3;
                        ogreSubMesh->indexData->indexBuffer = HardwareBufferManager::getSingleton().createIndexBuffer(HardwareIndexBuffer::IT_16BIT, ogreSubMesh->indexData->indexCount, HardwareBuffer::HBU_STATIC_WRITE_ONLY);
                        ogreSubMesh->setMaterialName(surface->name);
                        

                        if (ogreSubMesh->useSharedVertices)
                        {
                                unsigned short vertexDataOffset = 0;
                                if (ogreMesh->sharedVertexData) vertexDataOffset = ogreMesh->sharedVertexData->vertexCount;
                                ogreMesh->sharedVertexData = setupVertexData(points.size(), ogreMesh->sharedVertexData);
                                copyDataToVertexData(points, polygons, vmaps, ogreSubMesh->indexData, ogreMesh->sharedVertexData, vertexDataOffset);
                        }
                        else
                        {
                                ogreSubMesh->vertexData = setupVertexData(points.size());
                                copyDataToVertexData(points, polygons, vmaps, ogreSubMesh->indexData, ogreSubMesh->vertexData);
                        }
                }

                if (!SeparateLayers)
                {       
                        ogreMesh->_setBounds(Ogre::AxisAlignedBox(boundingBoxMin, boundingBoxMax));
                        ogreMesh->_setBoundingSphereRadius(Ogre::Math::Sqrt(std::max(boundingBoxMin.squaredLength(), boundingBoxMax.squaredLength())));
                }
                
                String fname = SeparateLayers ? makeLayerFileName(dest, ol, object->layers[ol]->name) : dest;

                Skeleton *skeleton = 0;

                if (flags[ExportSkeleton])
                        if (SeparateLayers)
                                skeleton = doExportSkeleton(fname, ol);
                        else
                                if (!ol) skeleton = doExportSkeleton(fname, -1);

                if (flags[GenerateLOD])
                {
                        ProgressiveMesh::VertexReductionQuota quota;

                        if (flags[UseFixedMethod])
                                quota = ProgressiveMesh::VRQ_CONSTANT;
                        else
                                quota = ProgressiveMesh::VRQ_PROPORTIONAL;
                                        
                        ogreMesh->generateLodLevels(distanceList, quota, reduction);
                }
                
                try
                {
                        meshserializer.exportMesh(ogreMesh, fname);
                }
                catch (...)
                {
                        cout << "Could not export to file: " << fname << endl;
                }

                ogreMesh->unload();

                delete ogreMesh;
                if (flags[ExportSkeleton] && skeleton) delete skeleton;

                if (!SeparateLayers) break;
        }

        return true;
}