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/*****************************************************************
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m3d_move.cpp Type:Func
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bouge de point 3D
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Date de creation : 6-2-1998 11 :22 :51
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Derniere version : 6-2-1998 11 :22 :51
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Vincent FRANCOIS
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*****************************************************************/
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/**************************/
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/* include */
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#include <stdio.h>
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#include <math.h>
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#include "const.h"
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#include "memoire.h"
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#include "struct.h"
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#include "struct3d.h"
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#include "prototype.h"
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/**************************/
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/* variables globales */
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extern struct environnement env;
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extern struct s_mesh *mesh;
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/**************************/
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/* programme principal */
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void o3d_move(int nump,float *coord_res,float *crit)
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{
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int n1,n2,n3 ;
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struct s_noeud *no,*no1,*no2,*no3;
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struct s_tetra *tet;
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int i, j ;
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float tab_crit[1000], vec_opt[3], cmin ;
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float tab_opt[3000] ;
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float gamma, vn[3], xi, yi, zi, vab[3], vac[3], vbc[3], hauteur ;
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float perimetre, coeff, alpha ;
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float delta[3] ;
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float vec_save[3], bmin, bmax, eps, crit_save ;
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float calpha, calpha_moins_eps, vresu[3] ;
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no=ADRESSE(nump,noeud,mesh->);
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if (no->type!=BODY) return;
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/* sauvegarde des coordonnees du noeud */
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vec_save[0] = no->x;
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vec_save[1] = no->y;
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vec_save[2] = no->z;
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/* tetraedres connectes au noeud */
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for (i=0;i<no->nb_tetra;i++)
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{
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tet=no->tetra[i];
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if (tet->etat!=ACTIF) continue;
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if (tet->n1==no->num)
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{
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n1=tet->n2;
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n2=tet->n4;
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n3=tet->n3;
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}
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if (tet->n2==no->num)
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{
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n1=tet->n1;
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n2=tet->n3;
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n3=tet->n4;
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}
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if (tet->n3==no->num)
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{
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n1=tet->n1;
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n2=tet->n4;
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n3=tet->n2;
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}
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if (tet->n4==no->num)
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{
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n1=tet->n1;
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n2=tet->n2;
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n3=tet->n3;
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}
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no1=ADRESSE(n1,noeud,mesh->);
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no2=ADRESSE(n2,noeud,mesh->);
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no3=ADRESSE(n3,noeud,mesh->);
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/* determination du point optimal de la face nb_ele */
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xi = (no1->x+no2->x+no3->x)/3. ;
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yi = (no1->y+no2->y+no3->y)/3. ;
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zi = (no1->z+no2->z+no3->z)/3. ;
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/* calcul de la normale a la face */
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VEC(vab,no1,no2);
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NORME(vab) ;
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VEC(vac,no1,no3);
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NORME(vac) ;
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VEC(vbc,no2,no3);
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NORME(vbc) ;
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/* calcul du critere 2 D */
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perimetre = vab[3] + vbc[3] + vbc[3] ;
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hauteur = (perimetre/3.) * 0.8 ;
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PVEC(vn,vab,vac);
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NORME(vn) ;
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/* calcul du vecteur AP et orientation de la face */
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/* point optimal */
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tab_opt[3*i] = xi + hauteur * vn[0] ;
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tab_opt[3*i+1] = yi + hauteur * vn[1] ;
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tab_opt[3*i+2] = zi + hauteur * vn[2] ;
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}
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/* calcul de la qualite de chaque tetraedre */
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cmin = 1. ;
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for (i=0;i<no->nb_tetra;i++)
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{
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tet=no->tetra[i];
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/* calcul du critere */
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if (tet->etat==ACTIF)
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{
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tab_crit[i] = m3d_cal_qual(tet->n1,tet->n2,tet->n3,tet->n4) ;
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if (tab_crit[i] < cmin) cmin = tab_crit[i] ;
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}
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else tab_crit[i]=0.;
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}
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/* calcul des coordonnees du point ideal */
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gamma = 0. ;
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for (i=0;i<no->nb_tetra;i++)
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if (tab_crit[i]!=0.) gamma = gamma + 1./(tab_crit[i]*tab_crit[i]) ;/* somme des carres des inverses */
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/* calcul du point optimal pour la boule */
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gamma = 1./gamma ;
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vec_opt[0] = 0. ;
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vec_opt[1] = 0. ;
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vec_opt[2] = 0. ;
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for (i=0;i<no->nb_tetra;i++)
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{
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if (tab_crit[i]!=0.)
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{
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coeff = gamma/(tab_crit[i]*tab_crit[i]) ;
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vec_opt[0] = vec_opt[0] + coeff * tab_opt[3*i] ;
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vec_opt[1] = vec_opt[1] + coeff * tab_opt[3*i+1] ;
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vec_opt[2] = vec_opt[2] + coeff * tab_opt[3*i+2] ;
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}
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}
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delta[0] = vec_opt[0] - no->x ;
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delta[1] = vec_opt[1] - no->y ;
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delta[2] = vec_opt[2] - no->z ;
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/* sauvegarde du critere mini */
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crit_save = cmin ;
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/* initialisation des bornes du parametre */
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bmin = 0. ;
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bmax = 1. ;
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vresu[0] = vec_save[0] ;
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vresu[1] = vec_save[1] ;
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vresu[2] = vec_save[2] ;
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for (i=0;i<5;i++)
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{
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alpha = 0.5 * (bmin + bmax) ;
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no->x = vec_save[0] + alpha * delta[0] ;
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no->y = vec_save[1] + alpha * delta[1] ;
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no->z = vec_save[2] + alpha * delta[2] ;
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/* evaluation de la qualite pour la valeur alpha */
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/* on evalue la qualite cmin pour alpha */
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calpha = 1. ;
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for (j=0;j<no->nb_tetra;j++)
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{
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tet=no->tetra[j];
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if (tet->etat!=ACTIF) continue;
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/* calcul du critere */
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tab_crit[j] = m3d_cal_qual(tet->n1,tet->n2,tet->n3,tet->n4) ;
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if (tab_crit[j] < calpha) calpha = tab_crit[j] ;
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}
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/* la valeur du critere pour alpha est superieure, il faut la stocker */
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if (calpha > crit_save)
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{
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vresu[0] = no->x ;
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vresu[1] = no->y ;
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vresu[2] = no->z ;
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crit_save = calpha ;
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}
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/* on evalue la qualite c1 pour alpha - eps */
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eps = (bmax-bmin)/50. ;
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no->x = vec_save[0] + (alpha - eps) * delta[0] ;
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no->y = vec_save[1] + (alpha - eps) * delta[1] ;
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no->z = vec_save[2] + (alpha - eps) * delta[2] ;
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calpha_moins_eps = 1. ;
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for (j=0;j<no->nb_tetra;j++)
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{
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tet=no->tetra[j];
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if (tet->etat!=ACTIF) continue;
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/* calcul du critere */
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tab_crit[j] = m3d_cal_qual(tet->n1,tet->n2,tet->n3,tet->n4) ;
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if (tab_crit[j] < calpha_moins_eps) calpha_moins_eps = tab_crit[j] ;
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}
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no->x = vec_save[0] + alpha * delta[0] ;
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no->y = vec_save[1] + alpha * delta[1] ;
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no->z = vec_save[2] + alpha * delta[2] ;
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if (calpha_moins_eps < calpha)
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{
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bmin = alpha ;
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/* bmax est inchange */
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}
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else
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{
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/* bmin est inchange */
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bmax = alpha ;
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}
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}
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coord_res[0] = vresu[0] ;
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coord_res[1] = vresu[1] ;
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coord_res[2] = vresu[2] ;
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no->x=vec_save[0];
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no->y=vec_save[1];
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no->z=vec_save[2];
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*crit=crit_save;
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}
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