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/*****************************************************************
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m3d_int_triangle.c Type:Func
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un point est il dans un triangle
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Date de creation : Mon Jun 30 12:05:37 1997
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Derniere version : Thu Jul 3 09:41:51 1997
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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 "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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int m3d_int_triangle(int n1,int n2,int n3,float x,float y,float z)
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{
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struct s_noeud *no1,*no2,*no3;
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float n1n2[3],n1n3[3],n2n3[3],n[3],n1p[3],n2p[3],n3p[3],pv1[3],pv2[3],pv3[3];
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float ps1,ps2,ps3,eps;
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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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VEC(n1n2,no1,no2);
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VEC(n1n3,no1,no3)
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PVEC(n,n1n2,n1n3);
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eps=PSCA(n1n2,n1n2);
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eps=eps*eps*4.*0.0001;
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n1p[0]=x-no1->x;n1p[1]=y-no1->y;n1p[2]=z-no1->z;
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n2p[0]=x-no2->x;n2p[1]=y-no2->y;n2p[2]=z-no2->z;
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n3p[0]=x-no3->x;n3p[1]=y-no3->y;n3p[2]=z-no3->z;
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PVEC(pv1,n1n2,n1p);
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ps1=PSCA(pv1,n);
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if (ps1>(-eps))
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{
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VEC(n2n3,no2,no3);
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PVEC(pv2,n2n3,n2p);
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ps2=PSCA(pv2,n);
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if (ps2>(-eps))
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{
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PVEC(pv3,n1n3,n3p)
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ps3=(-1)*PSCA(pv3,n);
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if (ps3>(-eps)) return(1);
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}
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}
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return(0);
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}
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