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/*****************************************************************
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m3d_angle_front.cpp Type:func
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Calcul l'angle entre deux triangles de front voisins
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Date de creation : 8-3-1999 15 :56 :44
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Derniere version : 8-3-1999 15 :56 :44
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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 <string.h>
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#include <stdlib.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 "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_angle_front(struct s_front3d *ft1, struct s_front3d *ft2)
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{
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struct s_noeud *no1,*no2,*no3,*no4,*no5,*no6,*noa,*nob,*noc,*nod;
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float n1n2[4],n1n3[4],n1[4],n[4],bc[4];
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float n2[4];
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float nbnd[4],milieu[4];
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float angle;
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float ps;
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no1=ADRESSE(ft1->n1,noeud,mesh->);
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no2=ADRESSE(ft1->n2,noeud,mesh->);
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no3=ADRESSE(ft1->n3,noeud,mesh->);
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no4=ADRESSE(ft2->n1,noeud,mesh->);
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no5=ADRESSE(ft2->n2,noeud,mesh->);
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no6=ADRESSE(ft2->n3,noeud,mesh->);
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if (!(no1==no4))
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if (!(no1==no5))
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if (!(no1==no6))
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{
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noa=no1;
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nob=no2;
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noc=no3;
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}
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if (!(no2==no4))
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if (!(no2==no5))
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if (!(no2==no6))
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{
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noa=no2;
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nob=no1;
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noc=no3;
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}
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if (!(no3==no4))
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if (!(no3==no5))
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if (!(no3==no6))
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{
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noa=no3;
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nob=no1;
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noc=no2;
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}
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if (!(no4==nob))
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if (!(no4==noc))
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nod=no4;
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if (!(no5==nob))
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if (!(no5==noc))
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nod=no5;
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if (!(no6==nob))
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if (!(no6==noc))
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nod=no6;
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milieu[0]=0.5*(nob->x+noc->x);
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milieu[1]=0.5*(nob->y+noc->y);
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milieu[2]=0.5*(nob->z+noc->z);
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VEC(bc,nob,noc);
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NORME(bc);
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n1[0]=noa->x-milieu[0];
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n1[1]=noa->y-milieu[1];
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n1[2]=noa->z-milieu[2];
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NORME(n1);
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PVEC(n,bc,n1);
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PVEC(n1,n,bc);
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NORME(n1);
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n2[0]=nod->x-milieu[0];
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n2[1]=nod->y-milieu[1];
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n2[2]=nod->z-milieu[2];
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NORME(n2);
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PVEC(n,bc,n2);
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PVEC(n2,n,bc);
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NORME(n2);
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ps=PSCA(n1,n2);
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if (ps>1.) ps=1.;
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if (ps<-1.) ps=-1.;
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angle=(float)acos((double)ps);
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VEC(n1n2,no1,no2);
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VEC(n1n3,no1,no3);
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PVEC(n,n1n2,n1n3);
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VEC(nbnd,nob,nod);
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NORME(n);
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NORME(nbnd);
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if (PSCA(n,nbnd)<0.0001) angle=2*PI-angle ;
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return(angle);
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}
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