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#include <stdio.h>
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#include <math.h>
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#include "m3d_struct.h"
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#include "m3d_const.h"
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#include "m3d_hotes.h"
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#include "m3d_erreur.h"
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#include "prototype.h"
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extern GEST_MEM *gest ;
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extern int debug ;
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int m3d_rech3(FACE *face,NOEUD **nresu)
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{
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int i, j, k, j1, j2, j3, j4 ;
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int is_j1, is_j2, is_j3, is_j4, nump,nb, num, card, nele ;
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int nb_noe_rec = 0 ;
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int nb_ele_rec = 0 ;
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float vab[3], vac[3], vn[3], pvec[3], norme, vap[3] ;
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FILE *stream ;
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float *coord ;
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int iptr ;
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coord = gest->coord ;
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j1 = j2 = j3 = j4 = 0 ;
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card = gest->card ;
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num = face->n1->num ;
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iptr = gest->tab_card[num] ;
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k = 0 ;
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nele = 0 ;
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nele = gest->tab_ref[iptr+k] ;
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while (nele>-1)
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{
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j1 = gest->tab_rec[4*nele] ;
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j2 = gest->tab_rec[4*nele+1] ;
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j3 = gest->tab_rec[4*nele+2] ;
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j4 = gest->tab_rec[4*nele+3] ;
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nb = 0 ;
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is_j1 = is_j2 = is_j3 = is_j4 = 0 ;
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if ((face->n1->num == j1) || (face->n2->num == j1) || (face->n3->num == j1)) { nb++ ; is_j1 = 1; }
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if ((face->n1->num == j2) || (face->n2->num == j2) || (face->n3->num == j2)) { nb++ ; is_j2 = 1; }
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if ((face->n1->num == j3) || (face->n2->num == j3) || (face->n3->num == j3)) { nb++ ; is_j3 = 1; }
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if ((face->n1->num == j4) || (face->n2->num == j4) || (face->n3->num == j4)) { nb++ ; is_j4 = 1; }
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if (nb == 3)
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{
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if (!is_j1) nump = j1 ;
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if (!is_j2) nump = j2 ;
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if (!is_j3) nump = j3 ;
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if (!is_j4) nump = j4 ;
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/* calcul de la normale */
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vab[0] = coord[x((face->n2)->num)] - coord[x((face->n1)->num)] ;
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vab[1] = coord[y((face->n2)->num)] - coord[y((face->n1)->num)] ;
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vab[2] = coord[z((face->n2)->num)] - coord[z((face->n1)->num)] ;
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vac[0] = coord[x((face->n3)->num)] - coord[x((face->n1)->num)] ;
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vac[1] = coord[y((face->n3)->num)] - coord[y((face->n1)->num)] ;
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vac[2] = coord[z((face->n3)->num)] - coord[z((face->n1)->num)] ;
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vn[0] = PVECX(vab,vac) ;
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vn[1] = PVECY(vab,vac) ;
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vn[2] = PVECZ(vab,vac) ;
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norme = NORME(vn) ;
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if (norme<EPSILON)
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{
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if (debug) printf("%s\n"," normale nulle M3D_RECH3 ") ;
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m3d_erreur(ERR_FIN) ;
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return(FAUX) ;
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}
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for (j=0;j<3;j++) vn[j] = vn[j]/norme ;
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vap[0] = coord[x(nump)] - coord[x((face->n1)->num)] ;
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vap[1] = coord[y(nump)] - coord[y((face->n1)->num)] ;
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vap[2] = coord[z(nump)] - coord[z((face->n1)->num)] ;
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if (PROSCA(vap,vn) > EPSILON) /* on a trouve le noeud solution */
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{
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ADRESSE(noeud,nump,*nresu)
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return(VRAI) ;
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}
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}
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k++ ;
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nele = gest->tab_ref[iptr+k] ;
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}
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*nresu = NULL ;
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return(VRAI) ;
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}
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