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/*****************************************************************
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o3d_cal_qual.cpp Type:Func
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Calcul de la qualite 3D non algebrique
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Date de creation : 9-9-1997 11 :6 :23
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Derniere version : 9-9-1997 11 :6 :23
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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 "struct.h"
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#include "memoire.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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float o3d_cal_qual(int n1,int n2,int n3,int n4)
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{
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struct s_noeud *no1,*no2,*no3,*no4;
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float x1,y1,z1,x2,y2,z2,x3,y3,z3,x4,y4,z4,crits;
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double ab[4],ac[4],cb[4],dac,dab,dcb,dmax,crit;
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double db[4],da[4],dc[4],dda,ddb,ddc,pvec[4],vol,som;
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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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no4=ADRESSE(n4,noeud,mesh->);
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x1=no1->x;y1=no1->y;z1=no1->z;
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x2=no2->x;y2=no2->y;z2=no2->z;
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x3=no3->x;y3=no3->y;z3=no3->z;
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x4=no4->x;y4=no4->y;z4=no4->z;
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ab[0]=x2-x1;ab[1]=y2-y1;ab[2]=z2-z1;
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ac[0]=x3-x1;ac[1]=y3-y1;ac[2]=z3-z1;
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cb[0]=x2-x3;cb[1]=y2-y3;cb[2]=z2-z3;
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db[0]=x2-x4;db[1]=y2-y4;db[2]=z2-z4;
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da[0]=x1-x4;da[1]=y1-y4;da[2]=z1-z4;
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dc[0]=x3-x4;dc[1]=y3-y4;dc[2]=z3-z4;
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dab=sqrt(ab[0]*ab[0]+ab[1]*ab[1]+ab[2]*ab[2]);
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dac=sqrt(ac[0]*ac[0]+ac[1]*ac[1]+ac[2]*ac[2]);
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dcb=sqrt(cb[0]*cb[0]+cb[1]*cb[1]+cb[2]*cb[2]);
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ddb=sqrt(db[0]*db[0]+db[1]*db[1]+db[2]*db[2]);
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dda=sqrt(da[0]*da[0]+da[1]*da[1]+da[2]*da[2]);
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ddc=sqrt(dc[0]*dc[0]+dc[1]*dc[1]+dc[2]*dc[2]);
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dmax=dab;
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if (dac>dmax)dmax=dac;
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if (dcb>dmax)dmax=dcb;
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if (ddb>dmax)dmax=ddb;
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if (dda>dmax)dmax=dda;
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if (ddc>dmax)dmax=ddc;
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PVEC(pvec,ab,ac);
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vol=pvec[0]*da[0]+pvec[1]*da[1]+pvec[2]*da[2];
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vol=fabs(vol);
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NORME(pvec);
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som=pvec[3]/2.;
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PVEC(pvec,ab,da);
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NORME(pvec);
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som=som+pvec[3]/2.;
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PVEC(pvec,ac,dc);
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NORME(pvec);
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som=som+pvec[3]/2.;
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PVEC(pvec,cb,db);
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NORME(pvec);
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som=som+pvec[3]/2.;
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crit = vol/som ;
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crit = (crit/dmax)/0.408249 ;
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crits=(float)crit;
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return(crits) ;
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}
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