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/*****************************************************************
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eval_dis_no_tri.cpp Type:Func
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Calcul de la distance entre un noeud et un triangle
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Date de creation : 30-7-1999 9 :28 :28
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Derniere version : 30-7-1999 9 :28 :28
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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 "struct3d.h"
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#include "prototype.h"
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/**************************/
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/* variables globales */
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extern struct environnment 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 eval_dis_no_tri(float x,float y,float z,struct s_triangle *tri)
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{
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struct s_noeud *no1,*no2,*no3;
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float n1n2[4],n1n3[4],n1n4[4],nn1[4],nn2[4],nn3[4],n1n[4];
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float det,xsi,eta,psi;
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float xproj,yproj,zproj,vec[4],dis,eps;
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eps=0.0001;
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no1=ADRESSE(tri->n1,noeud,mesh->);
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no2=ADRESSE(tri->n2,noeud,mesh->);
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no3=ADRESSE(tri->n3,noeud,mesh->);
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VEC(n1n2,no1,no2);
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VEC(n1n3,no1,no3);
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n1n4[0]=x-no1->x;
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n1n4[1]=y-no1->y;
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n1n4[2]=z-no1->z;
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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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if((eta > -eps) && (xsi > -eps) && ((eta+xsi) < 1.0+eps))
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{
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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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vec[0]=x-xproj;
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vec[1]=y-yproj;
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vec[2]=z-zproj;
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NORME(vec);
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dis=vec[3];
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}
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else
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{
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nn1[0]=no1->x-x;
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nn1[1]=no1->y-y;
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nn1[2]=no1->z-z;
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nn2[0]=no2->x-x;
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nn2[1]=no2->y-y;
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nn2[2]=no2->z-z;
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nn3[0]=no3->x-x;
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nn3[1]=no3->y-y;
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nn3[2]=no3->z-z;
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NORME(nn1);
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NORME(nn2);
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NORME(nn3);
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dis=0.33333333333*(nn1[3]+nn2[3]+nn3[3]);
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}
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return(dis);
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}
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