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/*****************************************************************
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m3d_angle_front2.cpp Type:Func
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Calcul l angle entre un element du front 3d et un noeud lie
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Date de creation : 10-3-1999 11 :32 :3
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Derniere version : 10-3-1999 11 :32 :3
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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_front2(struct s_front3d *ft,struct s_segment *seg)
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{
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int n1,n2,n3,n4;
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struct s_noeud *no1,*no2,*no3,*no4;
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float xproj,yproj,zproj,det,xsi,eta,psi;
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float n1n2[4],n1n3[4],n1n4[4],n1n[4],n1nproj[4];
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float angle,ps;
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if (seg->n1==ft->n1) {n1=ft->n1;n2=ft->n2;n3=ft->n3;n4=seg->n2;}
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else if (seg->n1==ft->n2) {n1=ft->n2;n2=ft->n3;n3=ft->n1;n4=seg->n2;}
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else if (seg->n1==ft->n3) {n1=ft->n3;n2=ft->n1;n3=ft->n2;n4=seg->n2;}
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else if (seg->n2==ft->n1) {n1=ft->n1;n2=ft->n2;n3=ft->n3;n4=seg->n1;}
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else if (seg->n2==ft->n2) {n1=ft->n2;n2=ft->n3;n3=ft->n1;n4=seg->n1;}
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else if (seg->n2==ft->n3) {n1=ft->n3;n2=ft->n1;n3=ft->n2;n4=seg->n1;}
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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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VEC(n1n2,no1,no2);
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VEC(n1n3,no1,no3);
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VEC(n1n4,no1,no4);
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PVEC(n1n,n1n2,n1n3);
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det=n1n2[0]*n1n3[1]*n1n[2]+n1n2[1]*n1n3[2]*n1n[0]+n1n2[2]*n1n3[0]*n1n[1]
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-n1n2[2]*n1n3[1]*n1n[0]-n1n2[0]*n1n3[2]*n1n[1]-n1n2[1]*n1n3[0]*n1n[2];
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xsi=n1n4[0]*n1n3[1]*n1n[2]+n1n4[1]*n1n3[2]*n1n[0]+n1n4[2]*n1n3[0]*n1n[1]
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-n1n4[2]*n1n3[1]*n1n[0]-n1n4[0]*n1n3[2]*n1n[1]-n1n4[1]*n1n3[0]*n1n[2];
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eta=n1n2[0]*n1n4[1]*n1n[2]+n1n2[1]*n1n4[2]*n1n[0]+n1n2[2]*n1n4[0]*n1n[1]
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-n1n2[2]*n1n4[1]*n1n[0]-n1n2[0]*n1n4[2]*n1n[1]-n1n2[1]*n1n4[0]*n1n[2];
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psi=n1n2[0]*n1n3[1]*n1n4[2]+n1n2[1]*n1n3[2]*n1n4[0]+n1n2[2]*n1n3[0]*n1n4[1]
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-n1n2[2]*n1n3[1]*n1n4[0]-n1n2[0]*n1n3[2]*n1n4[1]-n1n2[1]*n1n3[0]*n1n4[2];
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xsi=xsi/det;
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eta=eta/det;
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psi=psi/det;
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xproj=(1-xsi-eta)*no1->x+xsi*no2->x+eta*no3->x;
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yproj=(1-xsi-eta)*no1->y+xsi*no2->y+eta*no3->y;
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zproj=(1-xsi-eta)*no1->z+xsi*no2->z+eta*no3->z;
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n1nproj[0]=xproj-no1->x;
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n1nproj[1]=yproj-no1->y;
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n1nproj[2]=zproj-no1->z;
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NORME(n1n4);
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NORME(n1nproj);
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ps=PSCA(n1n4,n1nproj);
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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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if ((xsi<0.)||(eta<0.)) angle=angle+PI/2.;
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if (psi<0.) angle=2*PI-angle;
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return(angle);
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}
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