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vcglib/vcg/complex/intersection.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
$Log: not supported by cvs2svn $
Revision 1.11 2007/05/02 13:25:45 zifnab1974
only use typename when necessary
Revision 1.10 2007/04/10 22:46:57 pietroni
- line 152 changed call intersection to IntersectionPlaneTriangle because changing in function's name
Revision 1.9 2007/01/03 15:51:28 pietroni
added initial define and included missing files
Revision 1.8 2006/01/19 14:06:37 spinelli
add std:: namespace...
Revision 1.7 2005/10/03 16:18:15 spinelli
add template parameter for spatialindexing struction
Revision 1.6 2005/05/30 09:11:20 ganovelli
header added, error in include
Revision 1.3 2005/05/17 21:19:37 ganovelli
some std::and typename missing (CRS4)
Revision 1.2 2005/03/08 14:42:22 ganovelli
added vcg header
****************************************************************************/
#include<vector>
#include <algorithm>
#include<vcg/space/point3.h>
#include<vcg/space/plane3.h>
#include<vcg/space/segment3.h>
#include<vcg/space/intersection3.h>
#include<vcg/complex/edgemesh/allocate.h>
//#include<vcg/space/index/grid_static_ptr.h>
#include<algorithm>
#include<vcg/complex/trimesh/base.h>
#ifndef __VCGLIB_INTERSECTION_TRI_MESH
#define __VCGLIB_INTERSECTION_TRI_MESH
namespace vcg{
/** \addtogroup complex */
/*@{*/
/**
Function computing the intersection between a grid and a plane. It returns all the cells intersected
*/
template < typename GridType,typename ScalarType>
bool Intersect( GridType & grid,Plane3<ScalarType> plane, std::vector<typename GridType::Cell *> &cells){
Point3d p,_d;
Plane3d pl;
_d.Import(plane.Direction());
pl.SetDirection(_d);
pl.SetOffset(plane.Offset());
for( int ax = 0; ax <3; ++ax)
{ int axis = ax;
int axis0 = (axis+1)%3;
int axis1 = (axis+2)%3;
int i,j;
Point3i pi;
Segment3<double> seg;
seg.P0().Import(grid.bbox.min);
seg.P1().Import(grid.bbox.min);
seg.P1()[axis] = grid.bbox.max[axis];
for(i = 0 ; i <= grid.siz[axis0]; ++i){
for(j = 0 ; j <= grid.siz[axis1]; ++j)
{
seg.P0()[axis0] = grid.bbox.min[axis0]+ (i+0.01) * grid.voxel[axis0] ;
seg.P1()[axis0] = grid.bbox.min[axis0]+ (i+0.01) * grid.voxel[axis0];
seg.P0()[axis1] = grid.bbox.min[axis1]+ (j+0.01) * grid.voxel[axis1];
seg.P1()[axis1] = grid.bbox.min[axis1]+ (j+0.01) * grid.voxel[axis1];
if ( Intersection(pl,seg,p))
{
pi[axis] = std::min(std::max(0,(int)floor((p[axis ]-grid.bbox.min[axis])/grid.voxel[axis])),grid.siz[axis]);
pi[axis0] = i;
pi[axis1] = j;
grid.Grid(pi,axis,cells);
}
}
}
}
sort(cells.begin(),cells.end());
cells.erase(unique(cells.begin(),cells.end()),cells.end());
return false;
}
/*@}*/
/** \addtogroup complex */
/*@{*/
/**
Function computing the intersection between a trimesh and a plane. It returns an EdgeMesh.
Note: This version always returns a segment for each triangle of the mesh which intersects with the plane. In other
words there are 2*n vertices where n is the number of segments fo the mesh. You can run vcg::edge::Unify to unify
the vertices closer that a given value epsilon. Note that, due to subtraction error during triangle plane intersection,
it is not safe to put epsilon to 0.
// TODO si dovrebbe considerare la topologia face-face della trimesh per derivare quella della edge mesh..
*/
template < typename TriMeshType, typename EdgeMeshType, class ScalarType, class IndexingType >
bool Intersection( /*TriMeshType & m, */
Plane3<ScalarType> pl,
EdgeMeshType & em,
double& ave_length,
IndexingType *grid,
typename std::vector< typename IndexingType::Cell* >& cells)
{
typedef typename TriMeshType::FaceContainer FaceContainer;
typedef IndexingType GridType;
typename EdgeMeshType::VertexIterator vi;
typename TriMeshType::FaceIterator fi;
std::vector<typename TriMeshType::FaceType*> v;
v.clear();
Intersect(*grid,pl,cells);
Segment3<ScalarType> seg;
ave_length = 0.0;
typename std::vector<typename GridType::Cell*>::iterator ic;
typename GridType::Cell fs,ls;
for(ic = cells.begin(); ic != cells.end();++ic)
{
grid->Grid(*ic,fs,ls);
typename GridType::Link * lk = fs;
while(lk != ls){
typename TriMeshType::FaceType & face = *(lk->Elem());
if(!face.IsS())
{
face.SetS();
v.push_back(&face);
if(vcg::IntersectionPlaneTriangle(pl,face,seg))// intersezione piano triangolo
{
face.SetS();
// add to em
ave_length+=seg.Length();
vcg::edge::Allocator<EdgeMeshType>::AddEdges(em,1);
vi = vcg::edge::Allocator<EdgeMeshType>::AddVertices(em,2);
(*vi).P() = seg.P0();
em.edges.back().V(0) = &(*vi);
vi++;
(*vi).P() = seg.P1();
em.edges.back().V(1) = &(*vi);
}
}//endif
lk++;
}//end while
}
ave_length/=em.en;
typename std::vector<typename TriMeshType::FaceType*>::iterator v_i;
for(v_i=v.begin(); v_i!=v.end(); ++v_i) (*v_i)->ClearS();
return true;
}
/** \addtogroup complex */
/*@{*/
/**
Compute the intersection between a trimesh and a plane.
given a plane return the set of faces that are contained
into intersected cells.
*/
template < typename TriMeshType, class ScalarType, class IndexingType >
bool Intersection(Plane3<ScalarType> pl,
IndexingType *grid,
typename std::vector<typename TriMeshType::FaceType*> &v)
{
typedef typename TriMeshType::FaceContainer FaceContainer;
typedef IndexingType GridType;
typename TriMeshType::FaceIterator fi;
v.clear();
typename std::vector< typename GridType::Cell* > cells;
Intersect(*grid,pl,cells);
typename std::vector<typename GridType::Cell*>::iterator ic;
typename GridType::Cell fs,ls;
for(ic = cells.begin(); ic != cells.end();++ic)
{
grid->Grid(*ic,fs,ls);
typename GridType::Link * lk = fs;
while(lk != ls){
typename TriMeshType::FaceType & face = *(lk->Elem());
v.push_back(&face);
lk++;
}//end while
}//end for
return true;
}
/*****************************************************************/
/*INTERSECTION RAY - MESH */
/* */
/* Intersection between a Ray and a Mesh. Returns a 3D Pointset! */
/*****************************************************************/
template < typename TriMeshType, class ScalarType>
bool IntersectionRayMesh(
/* Input Mesh */ TriMeshType * m,
/* Ray */ const Line3<ScalarType> & ray,
/* Intersect Point */ Point3<ScalarType> & hitPoint)
{
//typedef typename TriMeshType::FaceContainer FaceContainer;
typename TriMeshType::FaceIterator fi;
bool hit=false;
if(m==0) return false;
//TriMeshType::FaceIterator fi;
//std::vector<TriMeshType::FaceType*>::iterator fi;
ScalarType bar1,bar2,dist;
Point3<ScalarType> p1;
Point3<ScalarType> p2;
Point3<ScalarType> p3;
for(fi = m->face.begin(); fi != m->face.end(); ++fi)
{
p1=vcg::Point3<ScalarType>( (*fi).P(0).X() ,(*fi).P(0).Y(),(*fi).P(0).Z() );
p2=vcg::Point3<ScalarType>( (*fi).P(1).X() ,(*fi).P(1).Y(),(*fi).P(1).Z() );
p3=vcg::Point3<ScalarType>( (*fi).P(2).X() ,(*fi).P(2).Y(),(*fi).P(2).Z() );
if(Intersection<ScalarType>(ray,p1,p2,p3,bar1,bar2,dist))
{
hitPoint= p1*(1-bar1-bar2) + p2*bar1 + p3*bar2;
hit=true;
}
}
return hit;
}
/*@}*/
} // end namespace vcg
#endif
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