vcglib/vcg/complex/tetramesh/update/triconvert.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
Revision 1.1 2004/22/04 14:32 pietroni
Initial commit
****************************************************************************/
#ifndef __VCG_TETRA_TRI_CONVERTER
#define __VCG_TETRA_TRI_CONVERTER
#include <map>
#include<vcg/space/tetra3.h>
namespace vcg {
namespace tetra {
/** Class TriConverter.
This is class for convetr tetrahedral mesh into triangle mesh
@param STL_VERT_CONT (Template Parameter) Specifies the type of the vertices container any the vertex type.
@param STL_TETRA_CONT (Template Parameter) Specifies the type of the tetrahedrons container any the tetrahedrons type.
*/
template < class TETRA_MESH ,class TRI_MESH >
class TriConverter
{
public:
/// The tetrahedral mesh type
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typedef typename TETRA_MESH TetraMeshType;
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/// The triangle mesh type
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typedef typename TRI_MESH TriangleMeshType;
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/// The tetrahedron type
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typedef typename TetraMeshType::TetraType TetraType;
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/// The triangle type
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typedef typename TriangleMeshType::FaceType FaceType;
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/// The vertex type of tetrahedreal Mesh
typedef typename TetraMeshType::VertexType TetraVertexType;
/// The vertex type of triangular Mesh
typedef typename TriangleMeshType::VertexType TriVertexType;
/// The type of vertex iterator on tetrahedral mesh
typedef typename TetraMeshType::VertexIterator TetraVertexIterator;
/// The type of vertex iterator on tetrahedral mesh
typedef typename TriangleMeshType::VertexIterator TriVertexIterator;
/// The type of tetra iterator
typedef typename TetraMeshType::TetraIterator TetraIterator;
/// The type of tetra iterator
typedef typename TriangleMeshType::FaceIterator FaceIterator;
/// The type of const tetra iterator
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typedef typename TetraMeshType::const_TetraIterator const_TetraIterator;
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/// The type of const face iterator
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typedef typename TriangleMeshType::ConstFaceIterator ConstFaceIterator;
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/// The type of tetrahedrons container
typedef typename TetraMeshType::TetraContainer TetraContainer;
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/// The type of const vertex pointer of tetrahedral mesh
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typedef typename TetraMeshType::const_VertexPointer const_VertexPointer;
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public:
/***********************************************/
/** @Convert to triangle-mesh functions
**/
//@{
///this function build a triangle mesh using the same pointers to the tetrahedral mesh vertex
void Convert(TetraContainer &tetra,TriangleMeshType &trim)
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{
TetraIterator ti;
TetraVertexType *v0;
TetraVertexType *v1;
TetraVertexType *v2;
trim.Clear();
for (ti=tetra.begin();ti<tetra.end();ti++)
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{
if (!(ti->IsD()))
{
if ((ti->IsBorderF(0))||(ti->IsBorderF(1))||(ti->IsBorderF(2))||(ti->IsBorderF(3)))
for (int i=0;i<4;i++)
if (ti->IsBorderF(i))
{
v0=ti->V(Tetra::VofF(i,0));
v1=ti->V(Tetra::VofF(i,1));
v2=ti->V(Tetra::VofF(i,2));
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FaceType f=FaceType();
f.ClearFlags();
f.V(0)=v0;
f.V(1)=v1;
f.V(2)=v2;
trim.face.push_back(f);
}
}
}
}
struct InsertedV{
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InsertedV( TriVertexType *_v,
FaceType* _f,
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int _z):v(_v),f(_f),z(_z){}
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TriVertexType *v;
FaceType* f;
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int z;
const bool operator <(const InsertedV & o){
return (v<o.v);
}
const bool operator ==(const InsertedV & o){
return (v==o.v);
}
const bool operator !=(const InsertedV & o){
return (v!=o.v);
}
};
///this function build a triangle mesh using new pointers to the tetrahedral mesh vertex
void ConvertCopy(TetraContainer &tetra,TriangleMeshType &trim)
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{
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vector<InsertedV > newVertices;
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TriVertexIterator vi;
vector<TriVertexType*> redirect;
Convert(tetra,trim);
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FaceIterator fi;
for(fi = trim.face.begin(); fi != trim.face.end(); ++fi){
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newVertices.push_back(InsertedV( (*fi).V(0),&(*fi),0));
newVertices.push_back(InsertedV( (*fi).V(1),&(*fi),1));
newVertices.push_back(InsertedV( (*fi).V(2),&(*fi),2));
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}
sort(newVertices.begin(),newVertices.end());
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vector<InsertedV>::iterator curr,next;
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int pos = 0;
curr = next = newVertices.begin();
while( next != newVertices.end()){
if((*curr)!=(*next))
pos++;
(*next).f->V( (*next).z) = (TriVertexType*)pos;
curr = next;
next++;
}
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vector<InsertedV>::iterator newE = unique(newVertices.begin(),newVertices.end());
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for(curr = newVertices.begin();curr!= newE;++curr)
trim.vert.push_back(*((*curr).v));
for(vi = trim.vert.begin(); vi != trim.vert.end(); ++vi)
redirect.push_back(&(*vi));
for(fi = trim.face.begin(); fi != trim.face.end(); ++fi){
(*fi).V(0) = redirect[(int)(*fi).V(0)];
(*fi).V(1) = redirect[(int)(*fi).V(1)];
(*fi).V(2) = redirect[(int)(*fi).V(2)];
}
trim.vn = trim.vert.size();
trim.fn = trim.face.size();
}
};// End class
/*@}*/
} // End namespace
} // End namespace
#endif