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//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#include "SilhouetteGeomEngine.h"
#include "Silhouette.h"
#include "../geometry/GeomUtils.h"
using namespace std;
Vec3r SilhouetteGeomEngine::_Viewpoint = Vec3r(0,0,0);
real SilhouetteGeomEngine::_translation[3] = {0,0,0};
real SilhouetteGeomEngine::_modelViewMatrix[4][4] = {{1,0,0,0},
{0,1,0,0},
{0,0,1,0},
{0,0,0,1}};
real SilhouetteGeomEngine::_projectionMatrix[4][4] = {{1,0,0,0},
{0,1,0,0},
{0,0,1,0},
{0,0,0,1}};
real SilhouetteGeomEngine::_transform[4][4] = {{1,0,0,0},
{0,1,0,0},
{0,0,1,0},
{0,0,0,1}};
int SilhouetteGeomEngine::_viewport[4] = {1,1,1,1}; // the viewport
real SilhouetteGeomEngine::_Focal = 0.0;
real SilhouetteGeomEngine::_glProjectionMatrix[4][4] = {{1,0,0,0},
{0,1,0,0},
{0,0,1,0},
{0,0,0,1}};
real SilhouetteGeomEngine::_glModelViewMatrix[4][4] = {{1,0,0,0},
{0,1,0,0},
{0,0,1,0},
{0,0,0,1}};
real SilhouetteGeomEngine::_znear = 0.0;
real SilhouetteGeomEngine::_zfar = 100.0;
SilhouetteGeomEngine * SilhouetteGeomEngine::_pInstance = 0;
void SilhouetteGeomEngine::SetTransform(const real iModelViewMatrix[4][4], const real iProjectionMatrix[4][4], const int iViewport[4], real iFocal)
{
unsigned int i,j;
_translation[0] = iModelViewMatrix[3][0];
_translation[1] = iModelViewMatrix[3][1];
_translation[2] = iModelViewMatrix[3][2];
for(i=0; i<4; i++){
for(j=0; j<4; j++)
{
_modelViewMatrix[i][j] = iModelViewMatrix[j][i];
_glModelViewMatrix[i][j] = iModelViewMatrix[i][j];
}
}
for(i=0; i<4; i++){
for(j=0; j<4; j++)
{
_projectionMatrix[i][j] = iProjectionMatrix[j][i];
_glProjectionMatrix[i][j] = iProjectionMatrix[i][j];
}
}
for(i=0; i<4; i++){
for(j=0; j<4; j++)
{
_transform[i][j] = 0;
for(unsigned int k=0; k<4; k++)
_transform[i][j] += _projectionMatrix[i][k] * _modelViewMatrix[k][j];
}
}
for(i=0; i<4; i++){
_viewport[i] = iViewport[i];
}
_Focal = iFocal;
}
void SilhouetteGeomEngine::SetFrustum(real iZNear, real iZFar)
{
_znear = iZNear;
_zfar = iZFar;
}
void SilhouetteGeomEngine::retrieveViewport(int viewport[4]){
memcpy(viewport, _viewport, 4*sizeof(int));
}
//#define HUGE 1e9
void SilhouetteGeomEngine::ProjectSilhouette(vector<SVertex*>& ioVertices)
{
Vec3r newPoint;
// real min=HUGE;
// real max=-HUGE;
vector<SVertex*>::iterator sv, svend;
for(sv=ioVertices.begin(), svend=ioVertices.end();
sv!=svend;
sv++)
{
GeomUtils::fromWorldToImage((*sv)->point3D(), newPoint, _modelViewMatrix, _projectionMatrix, _viewport);
newPoint[2] = (-newPoint[2]-_znear)/(_zfar-_znear); // normalize Z between 0 and 1
(*sv)->SetPoint2D(newPoint);
//cerr << (*sv)->point2d().z() << " ";
// real d=(*sv)->point2d()[2];
// if (d>max) max =d;
// if (d<min) min =d;
}
// for(sv=ioVertices.begin(), svend=ioVertices.end();
// sv!=svend;
// sv++)
// {
// Vec3r P((*sv)->point2d());
// (*sv)->SetPoint2D(Vec3r(P[0], P[1], 1.0-(P[2]-min)/(max-min)));
// //cerr<<(*sv)->point2d()[2]<<" ";
// }
}
void SilhouetteGeomEngine::ProjectSilhouette(SVertex* ioVertex)
{
Vec3r newPoint;
// real min=HUGE;
// real max=-HUGE;
vector<SVertex*>::iterator sv, svend;
GeomUtils::fromWorldToImage(ioVertex->point3D(), newPoint, _modelViewMatrix, _projectionMatrix, _viewport);
newPoint[2] = (-newPoint[2]-_znear)/(_zfar-_znear); // normalize Z between 0 and 1
ioVertex->SetPoint2D(newPoint);
}
real SilhouetteGeomEngine::ImageToWorldParameter(FEdge *fe, real t)
{
// we need to compute for each parameter t the corresponding
// parameter T which gives the intersection in 3D.
//currentEdge = (*fe);
Vec3r A = (fe)->vertexA()->point3D();
Vec3r B = (fe)->vertexB()->point3D();
Vec3r Ai = (fe)->vertexA()->point2D();
Vec3r Bi = (fe)->vertexB()->point2D();
Vec3r AB = Vec3r((B-A)); // the edge
Vec3r ABi(Bi-Ai);
Vec3r Ac, Bc;
GeomUtils::fromWorldToCamera(A, Ac, _modelViewMatrix);
GeomUtils::fromWorldToCamera(B, Bc, _modelViewMatrix);
Vec3r Ii = Vec3r((Ai+t*ABi)); // I image
// let us compute the 3D point corresponding to the 2D intersection point
// and lying on the edge:
Vec3r Ir, Ic;
GeomUtils::fromImageToRetina(Ii, Ir, _viewport);
GeomUtils::fromRetinaToCamera(Ir, Ic, -_Focal, _projectionMatrix);
real T;
T = (Ic[2]*Ac[1] - Ic[1]*Ac[2])/(Ic[1]*(Bc[2]-Ac[2])-Ic[2]*(Bc[1]-Ac[1]));
return T;
}
Vec3r SilhouetteGeomEngine::WorldToImage(const Vec3r& M)
{
Vec3r newPoint;
GeomUtils::fromWorldToImage(M, newPoint, _transform, _viewport);
newPoint[2] = (-newPoint[2]-_znear)/(_zfar-_znear); // normalize Z between 0 and 1
return newPoint;
}
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