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#include <stdio.h>
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#include <math.h>
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#include "r3d_struct.h"
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#include "m3d_const.h"
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#include "m3d_hotes.h"
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#include "prototype2.h"
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extern int debug ;
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int r3d_switch(float *coord,FACE *face,TETRAEDRE *tetra,int *numele)
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{
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int n1, n2, n3, n4, i;
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float vab[3], vac[3], vn[3], norme, pvec[3],vap[3], dist, dab, dac, dref ;
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NOEUD *noe ;
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if (face->hist == 0 ) return(VRAI) ;
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n1 = face->n1->num ;
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n2 = face->n2->num ;
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n3 = face->n3->num ;
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if ( (numele[4*(tetra->num)]!=n1) && (numele[4*(tetra->num)]!=n2) && (numele[4*(tetra->num)]!=n3))
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n4 = numele[4*(tetra->num)] ;
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else if ( (numele[4*(tetra->num) + 1]!=n1) && (numele[4*(tetra->num)+ 1]!=n2) && (numele[4*(tetra->num) + 1]!=n3))
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n4 = numele[4*(tetra->num) + 1] ;
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else if ( (numele[4*(tetra->num) + 2]!=n1) && (numele[4*(tetra->num) + 2]!=n2) && (numele[4*(tetra->num) + 2]!=n3))
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n4 = numele[4*(tetra->num) + 2] ;
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else n4 = numele[4*(tetra->num) + 3] ;
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/* calcul de la normale */
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vab[0] = coord[x(n2)] - coord[x(n1)] ;
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vab[1] = coord[y(n2)] - coord[y(n1)] ;
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vab[2] = coord[z(n2)] - coord[z(n1)] ;
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dab = NORME(vab) ;
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vac[0] = coord[x(n3)] - coord[x(n1)] ;
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vac[1] = coord[y(n3)] - coord[y(n1)] ;
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vac[2] = coord[z(n3)] - coord[z(n1)] ;
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dac = NORME(vac) ;
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dref = max(dab,dac) ;
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/* calcul du critere 2 D */
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pvec[0] = PVECX(vab,vac) ;
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pvec[1] = PVECY(vab,vac) ;
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pvec[2] = PVECZ(vab,vac) ;
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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"," erreur normale nulle M3D_SWITCH ") ;
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return(FAUX) ;
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}
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for (i=0;i<3;i++) vn[i] = vn[i]/norme ;
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/* position de n4 par rapport au plan */
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/* calcul du vecteur PA */
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vap[0] = coord[x(n4)] - coord[x(n1)] ;
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vap[1] = coord[y(n4)] - coord[y(n1)] ;
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vap[2] = coord[z(n4)] - coord[z(n1)] ;
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dist = PROSCA(vap,vn) ;
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if (dist>dref*EPSILON) /* pas la peine d'inverser la face */
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{
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return(VRAI) ;
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}
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else
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{
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noe = face->n3 ;
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face->n3 = face->n2 ;
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face->n2 = noe ;
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}
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return(VRAI) ;
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}
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