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/*****************************************************************
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m3d_cal_vol.cpp Type:func
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Calcul le volume d un tetra
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Date de creation : 28-7-1999 17 :5 :59
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Derniere version : 28-7-1999 17 :5 :59
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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 m3d_cal_vol(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;
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double ab[4],ac[4];
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double da[4],pvec[4],vol;
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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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da[0]=x1-x4;da[1]=y1-y4;da[2]=z1-z4;
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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)/3.;
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return(vol);
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}
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