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vcglib/vcg/complex/tetramesh/edge_split.h

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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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 *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
****************************************************************************/
#ifndef __VCG_TETRA_EDGE_SPLIT
#define __VCG_TETRA_EDGE_SPLIT
#include <vcg/simplex/tetrahedron/pos.h>
#include <vcg/complex/tetramesh/allocate.h>
#include <vcg/complex/tetramesh/update/topology.h>
#include <vcg/space/tetra.h>
namespace vcg{
namespace tetra{
/** \addtogroup tetramesh */
/*@{*/
/// This Class is used for split the edges
template <class TETRA_MESH_TYPE>
class EdgeSplit
{
public:
/// The tetrahedral mesh type
typedef typename TETRA_MESH_TYPE TetraMeshType;
/// The tetrahedron type
typedef typename TetraMeshType::TetraType TetraType;
/// The vertex type
typedef typename TetraType::VertexType VertexType;
/// The vertex iterator type
typedef typename TetraMeshType::VertexIterator VertexIterator;
/// The tetra iterator type
typedef typename TetraMeshType::TetraIterator TetraIterator;
/// The coordinate type
typedef typename TetraType::VertexType::CoordType CoordType;
///the container of tetrahedron type
typedef typename TetraMeshType::TetraContainer TetraContainer;
///the container of vertex type
typedef typename TetraMeshType::VertexContainer VertexContainer;
/// The HEdgePos type
typedef PosLoop<TetraType> PosType;
/// The topology updater type
typedef vcg::tetra::UpdateTetraTopology<VertexContainer,TetraContainer> Topology;
/// The allocator type
typedef vcg::tetra::Allocator<TetraMeshType> TetraAllocator;
/// Default Constructor
EdgeSplit()
{
};
~EdgeSplit()
{
};
private:
///the tetrahedron that must mark as Deleted after substitution
TetraType* _toDel[30];
///The number of tetrahedrons that are substituted
int _nT;
Topology _Topo;
///add a vertex into the edge at distance alfa ( 0<alfa<1) to the first vertex of the edge
VertexType* _AddVertexEdge(TetraMeshType &tm,const TetraType &t,const int &edge,const double &alfa)
{
VertexType *v0=(VertexType*)t.V(Tetra::VofE(edge,0));
VertexType *v1=(VertexType*)t.V(Tetra::VofE(edge,1));
Allocator<TetraMeshType> All= Allocator<TetraMeshType>();
VertexIterator vn=All.AddVertices(tm,1);
vn->Flags()=0;
vn->VTb()=NULL;
vn->VTi()=-1;
vn->P()=(v0->P()*alfa)+(v1->P()*(1.0f-alfa));
return (&(*vn));
}
///set the default v-t topology
void _SetDefultVTTopology(TetraType *t)
{
unsigned int j;
for (j=0;j<4;j++)
{
t->TVp(j) = NULL;
t->TVi(j) = -1;
}
}
/// Transform the vertex index according to rotation of the tetraedron
/// that trasform it in the basic case
static int _GetMapVertEdgeRot(const int &indexE,const int &indexV)
{
static int mapvertedgerot[12][4]={
{0,3,1,2},
{0,1,2,3},
{0,2,3,1},
{1,3,2,0},
{1,0,3,2},
{2,1,3,0},
{1,2,0,3},
{2,3,0,1},
{3,1,0,2},
{2,0,1,3},
{3,2,1,0},
{3,0,2,1},
};
assert ((indexE<12)&&(indexV<4));
return mapvertedgerot[indexE][indexV];
}
/// Transform the face index according to rotation of the tetraedron
/// that trasform it in the basic case
static int _GetMapFaceEdgeRot(const int &indexE,const int &indexF)
{
static int mapfaceedgerot[12][4]={
{1,2,0,3},
{0,1,2,3},
{2,0,1,3},
{3,1,0,2},
{1,0,3,2},
{3,0,2,1},
{0,3,1,2},
{2,3,0,1},
{1,3,2,0},
{0,2,3,1},
{3,2,1,0},
{2,1,3,0},
};
assert ((indexE<12)&&(indexF<4));
return mapfaceedgerot[indexE][indexF];
}
/// Returns the rotation sense during the loop on the edge to divide
/// according to rotation of the tetraedron that trasform it in the basic case
static int _GetDirRot(int indexE,int indexF)
{
static int mapfaceedgerot[12][4]={
{2,0,-1,-1},
{0,-1,2,-1},
{-1,2,0,-1},
{2,-1,-1,0},
{-1,0,-1,2},
{-1,-1,2,0},
{0,2,-1,-1},
{2,-1,0,-1},
{-1,0,2,-1},
{0,-1,-1,2},
{-1,2,-1,0},
{-1,-1,0,2},
};
assert ((indexE<12)&&(indexF<4));
return mapfaceedgerot[indexE][indexF];
}
///Built an Half edge on tetrahedron t using edge edge
PosType _FindPos(TetraType *t,int edge)
{
int face0=Tetra::FofE(edge,0);
int ve0=Tetra::VofE(edge,0);
PosType pos(t,face0,edge,ve0);
return pos;
}
///Assert the right order of vertex that compose the tetrahedron
void _AssertOrder(TetraType *t,VertexType *v0,VertexType *v1,VertexType *v2,VertexType *v3)
{
assert(t->V(0)==v0);
assert(t->V(1)==v1);
assert(t->V(2)==v2);
assert(t->V(3)==v3);
}
///Connect trought Tetrahedron-Tetrahedron Topology t0 and t1 with faces i0 and i1
void _ConnectTTTopology(TetraType *t0,int i0,TetraType *t1,int i1)
{
assert((i0>=0)&&(i0<4));
assert((i1>=0)&&(i1<4));
assert((!t0->IsD())&&(!t1->IsD()));
t0->TTp(i0)=t1;
t0->TTi(i0)=i1;
t1->TTp(i1)=t0;
t1->TTi(i1)=i0;
assert( (((t0->TTp(i0))->TTp(t0->TTi(i0)))==t0));
assert( (((t1->TTp(i1))->TTp(t1->TTi(i1)))==t1));
}
///Divide the tetrahadron in pos in two tetrahedrons using the new vertex vnew
void _Divide(PosType pos,VertexType *vnew,TetraType *newtp0,TetraType *newtp1,bool invert)
{
int curredge=pos.E();
//control if the edge vertices arein the right order for the table
if (invert)
curredge+=6;
//find the new position to vertex according
int ie0=_GetMapVertEdgeRot(curredge,0);
int ie1=_GetMapVertEdgeRot(curredge,2);
int in0=_GetMapVertEdgeRot(curredge,1);
int in1=_GetMapVertEdgeRot(curredge,3);
//as first the ones that appartain to the selected curredge
VertexType *ve0=pos.T()->V(ie0);
VertexType *ve1=pos.T()->V(ie1);
//and after the others that will be in the cutting plane
VertexType *vn0=pos.T()->V(in0);
VertexType *vn1=pos.T()->V(in1);
newtp0->V(0)=ve0;
newtp0->V(1)=vn0;
newtp0->V(2)=vnew;
newtp0->V(3)=vn1;
newtp1->V(0)=vnew;
newtp1->V(1)=vn0;
newtp1->V(2)=ve1;
newtp1->V(3)=vn1;
//right order of the vertices
#ifdef _DEBUG
_AssertOrder(newtp0,ve0,vn0,vnew,vn1);
_AssertOrder(newtp1,vnew,vn0,ve1,vn1);
//end asserts
#endif
}
bool _InvertRotation(PosType pos)
{
return (pos.V()!=Tetra::VofE(pos.E(),0));
}
///substitute the told tetrahedon on VT topology with newtp0 and newtp1 as created
void _SubstituteVTTopology(TetraType *told,TetraType *newtp0,TetraType *newtp1)
{
_SetDefultVTTopology(newtp0);
_SetDefultVTTopology(newtp1);
//detach the old tetrahedron from VTtopology
_Topo.DetachVTTopology(told);
//tetrahedron 0
_Topo.InsertVTTopology(newtp0);
//tetrahedron 1
_Topo.InsertVTTopology(newtp1);
}
///control if the connections between tetrahedron created have the right shared vertices
void _ControlConnection(TetraType *oldtp0,TetraType *newtp0)
{
VertexType *v00=oldtp0->V(0);
VertexType *v01=oldtp0->V(1);
VertexType *v02=oldtp0->V(2);
VertexType *v03=oldtp0->V(3);
VertexType *v10=newtp0->V(0);
VertexType *v11=newtp0->V(1);
VertexType *v12=newtp0->V(2);
VertexType *v13=newtp0->V(3);
assert(((v00==v10)&&(v02==v12))||((v00==v12)&&(v02==v10)));
assert(((v01==v13)&&(v03!=v11))||((v01!=v13)&&(v03==v11)));
}
///set as extern the 4 faces of the tetrahedron
void _SetDefaultTTExtern(TetraType *t)
{
for (int y=0;y<4;y++)
{
t->TTp(y)=t;
t->TTi(y)=y;
}
}
///substitute in Tetra Tetra Topology the tetrahedron old_t with new_t in according
///to face and edge
void _SubstituteTTTopology(TetraType *old_t,TetraType *new_t,int edgerot,int face)
{
int indexface=_GetMapFaceEdgeRot(edgerot,face);
if (old_t->IsBorderF(indexface))
{
new_t->TTp(face)=new_t;
new_t->TTi(face)=face;
}
else
{
TetraType *tetrad=old_t->TTp(indexface);
int fad=old_t->TTi(indexface);
_ConnectTTTopology(new_t,face,tetrad,fad);
assert (!tetrad->IsD());
}
}
/// sobstitute the old tetrahedrons that share the edge in pos with new ones
/// that share the vertex vnew that divide the old edge
void _AddNewTetrahedrons(TetraMeshType &tm,PosType pos,VertexType *vnew)
{
TetraType *oldtp0=NULL;
TetraType *oldtp1=NULL;
TetraType *newtp0;
TetraType *newtp1;
TetraType *firsttp0=NULL;
TetraType *firsttp1=NULL;
int curredge;
int direction=-1;
bool invert=false;
TetraAllocator All=TetraAllocator();
pos.Reset();
_nT=0;
while (!pos.LoopEnd())
{
assert(!pos.T()->IsD());
invert=_InvertRotation(pos);
//CREATE THE NEW TETRAHEDRONS
//create the new ones putting the veritices in the right order
TetraIterator ti=All.AddTetra(tm,2);
newtp0 = &(*ti);
ti++;
newtp1 = &(*ti);
_Divide(pos,vnew,newtp0,newtp1,invert);
#ifdef _DEBUG
if ((oldtp0!=NULL)&&(!pos.Jump()))
_ControlConnection(oldtp0,newtp0);
if ((oldtp1!=NULL)&&(!pos.Jump()))
_ControlConnection(oldtp1,newtp1);
#endif
// SUBSTITUTE NEW TETRAHEDRONS ON VT TOPOLOGY
if (tm.HasVTTopology())
_SubstituteVTTopology(pos.T(),newtp0,newtp1);
//THEN SET THE T-T TOPOLOGY
_SetDefaultTTExtern(newtp0);
_SetDefaultTTExtern(newtp1);
curredge=pos.E();
if (invert)
curredge+=6;
//face3
_SubstituteTTTopology(pos.T(),newtp1,curredge,3);
//face1
_SubstituteTTTopology(pos.T(),newtp0,curredge,1);
//now I set t-t topology between themselfes
_ConnectTTTopology(newtp0,3,newtp1,1);
if (pos.Jump())
{
vnew->SetB();
oldtp0=NULL;
oldtp1=NULL;
}
direction=_GetDirRot(curredge,pos.F());
assert(direction!=-1);
//control the direction of moving
if ((oldtp0!=NULL)&&(oldtp1!=NULL))
{
//direction=_GetDirRot(oldtp0,newtp0);
//find direction of moving
if (direction==0)
{
_ConnectTTTopology(oldtp0,0,newtp0,2);
_ConnectTTTopology(oldtp1,0,newtp1,2);
}
else
if (direction==2)
{
_ConnectTTTopology(oldtp0,2,newtp0,0);
_ConnectTTTopology(oldtp1,2,newtp1,0);
}
}
//assign if it is the first one
if (firsttp0==NULL)
firsttp0=newtp0;
if (firsttp1==NULL)
firsttp1=newtp1;
oldtp0=newtp0;
oldtp1=newtp1;
_toDel[_nT]=pos.T();
_nT++;
pos.NextT();
}
//at the end I finish the connections
if (!(pos.Jump())&&(direction==0)&&(firsttp0!=NULL)&&(firsttp1!=NULL)&&(oldtp0!=NULL)&&(oldtp1!=NULL))
{
_ConnectTTTopology(oldtp0,0,firsttp0,2);
_ConnectTTTopology(oldtp1,0,firsttp1,2);
}
else if (!(pos.Jump())&&(direction==2)&&(firsttp0!=NULL)&&(firsttp1!=NULL)&&(oldtp0!=NULL)&&(oldtp1!=NULL))
{
_ConnectTTTopology(oldtp0,2,firsttp0,0);
_ConnectTTTopology(oldtp1,2,firsttp1,0);
}
else if (pos.Jump())
vnew->SetB();
}
///Mark as deleted the tetrahedron that must be substituted
void _DeleteOldTetra()
{
for (int i=0;i<_nT;i++)
_toDel[i]->SetD();
}
//=========================================================================
public:
/// Split the edge with local remeshing
/// Tetrahedron-Tetrahedron topology is required
VertexType* DoSplit(TetraMeshType &tm,TetraType *t,int edge,double alfa)
{
assert(!t->IsD());
assert(tm.HasTTTopology());
assert((alfa>0)&&(alfa<1));
assert((edge>=0)&&(edge<6));
VertexType *vnew=_AddVertexEdge(tm,*t,edge,alfa);
_AddNewTetrahedrons(tm,_FindPos(t,edge),vnew);
_DeleteOldTetra();
return(vnew);
}
};//end class
}//end namespace tetra
}//end namespace vcg
#endif
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