| 1 |
|
1 |
/*****************************************************************
|
| 2 |
|
|
|
| 3 |
|
|
m3d_int_triangle.c Type:Func
|
| 4 |
|
|
|
| 5 |
|
|
un point est il dans un triangle
|
| 6 |
|
|
|
| 7 |
|
|
Date de creation : Mon Jun 30 12:05:37 1997
|
| 8 |
|
|
|
| 9 |
|
|
Derniere version : Thu Jul 3 09:41:51 1997
|
| 10 |
|
|
|
| 11 |
|
|
|
| 12 |
|
|
|
| 13 |
|
|
|
| 14 |
|
|
Vincent FRANCOIS
|
| 15 |
|
|
|
| 16 |
|
|
*****************************************************************/
|
| 17 |
|
|
|
| 18 |
|
|
|
| 19 |
|
|
|
| 20 |
|
|
|
| 21 |
|
|
|
| 22 |
|
|
/**************************/
|
| 23 |
|
|
/* include */
|
| 24 |
|
|
#include <stdio.h>
|
| 25 |
|
|
#include <math.h>
|
| 26 |
|
|
#include "const.h"
|
| 27 |
|
|
#include "memoire.h"
|
| 28 |
|
|
#include "struct.h"
|
| 29 |
|
|
#include "prototype.h"
|
| 30 |
|
|
|
| 31 |
|
|
/**************************/
|
| 32 |
|
|
/* variables globales */
|
| 33 |
|
|
extern struct environnement env;
|
| 34 |
|
|
extern struct s_mesh *mesh;
|
| 35 |
|
|
|
| 36 |
|
|
|
| 37 |
|
|
|
| 38 |
|
|
/**************************/
|
| 39 |
|
|
/* programme principal */
|
| 40 |
|
|
|
| 41 |
|
|
int m3d_int_triangle(int n1,int n2,int n3,float x,float y,float z)
|
| 42 |
|
|
{
|
| 43 |
|
|
struct s_noeud *no1,*no2,*no3;
|
| 44 |
|
|
float n1n2[3],n1n3[3],n2n3[3],n[3],n1p[3],n2p[3],n3p[3],pv1[3],pv2[3],pv3[3];
|
| 45 |
|
|
float ps1,ps2,ps3,eps;
|
| 46 |
|
|
|
| 47 |
|
|
no1=ADRESSE(n1,noeud,mesh->);
|
| 48 |
|
|
no2=ADRESSE(n2,noeud,mesh->);
|
| 49 |
|
|
no3=ADRESSE(n3,noeud,mesh->);
|
| 50 |
|
|
VEC(n1n2,no1,no2);
|
| 51 |
|
|
VEC(n1n3,no1,no3)
|
| 52 |
|
|
PVEC(n,n1n2,n1n3);
|
| 53 |
|
|
eps=PSCA(n1n2,n1n2);
|
| 54 |
|
|
eps=eps*eps*4.*0.0001;
|
| 55 |
|
|
n1p[0]=x-no1->x;n1p[1]=y-no1->y;n1p[2]=z-no1->z;
|
| 56 |
|
|
n2p[0]=x-no2->x;n2p[1]=y-no2->y;n2p[2]=z-no2->z;
|
| 57 |
|
|
n3p[0]=x-no3->x;n3p[1]=y-no3->y;n3p[2]=z-no3->z;
|
| 58 |
|
|
PVEC(pv1,n1n2,n1p);
|
| 59 |
|
|
ps1=PSCA(pv1,n);
|
| 60 |
|
|
if (ps1>(-eps))
|
| 61 |
|
|
{
|
| 62 |
|
|
VEC(n2n3,no2,no3);
|
| 63 |
|
|
PVEC(pv2,n2n3,n2p);
|
| 64 |
|
|
ps2=PSCA(pv2,n);
|
| 65 |
|
|
if (ps2>(-eps))
|
| 66 |
|
|
{
|
| 67 |
|
|
PVEC(pv3,n1n3,n3p)
|
| 68 |
|
|
ps3=(-1)*PSCA(pv3,n);
|
| 69 |
|
|
if (ps3>(-eps)) return(1);
|
| 70 |
|
|
}
|
| 71 |
|
|
}
|
| 72 |
|
|
|
| 73 |
|
|
return(0);
|
| 74 |
|
|
}
|
