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/*****************************************************************
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geo_int_stra_plane.c Type:Func
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Intersection straight plane
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Date de creation : Tue Jul 8 09:36:37 1997
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Derniere version : Thu Jul 10 10:03:31 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 <string.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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/**************************/
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/* programme principal */
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int geo_int_stra_plane(struct s_edge *edge,struct s_straight *straight,float x1,float y1,float z1,float x2,float y2,float z2,float x3,float y3,float z3,float *x,float *y,float *z)
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{
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struct s_par_straight *param;
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float ox[4],oy[4],oz[4],deno,t,tt,ttt,delta,res[4];
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int n1,n2;
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param=straight->param;
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/* definition du plan */
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ox[0]=x2-x1;ox[1]=y2-y1;ox[2]=z2-z1;
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oy[0]=x3-x1;oy[1]=y3-y1;oy[2]=z3-z1;
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PVEC(oz,ox,oy);
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oz[3]=(-oz[0]*x1-oz[1]*y1-oz[2]*z1);
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/* resolution */
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deno=oz[0]*param->dir[0]+oz[1]*param->dir[1]+oz[2]*param->dir[2];
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if (EGAL(deno,0.0,0.0001)) return(0);
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t=oz[0]*param->root[0]+oz[1]*param->root[1]+oz[2]*param->root[2]+oz[3];
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t=(-t)/deno;
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/* validation de la resolution */
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if ((edge->t2>0.) && ((t<edge->t1) || (t>edge->t2+edge->t1))) return(0);
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if ((edge->t2<0.) && ((t>edge->t1) || (t<edge->t2+edge->t1))) return(0);
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*x=param->root[0]+t*param->dir[0];
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*y=param->root[1]+t*param->dir[1];
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*z=param->root[2]+t*param->dir[2];
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delta=ox[0]*oy[1]-ox[1]*oy[0];
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if (EGAL(delta,0.0,0.0001))
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{
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delta=ox[0]*oy[2]-ox[2]*oy[0];
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if (EGAL(delta,0.0,0.0001))
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{
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delta=ox[1]*oy[2]-ox[2]*oy[1];
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n1=1;n2=2;
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}
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else
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{
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n1=0;n2=2;
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}
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}
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else
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{
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n1=0;n2=1;
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}
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res[0]=*x-x1;res[1]=*y-y1;res[2]=*z-z1;
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tt=(res[n1]*oy[n2]-res[n2]*oy[n1])/delta;
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ttt=(ox[n1]*res[n2]-ox[n2]*res[n1])/delta;
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if ((tt<0.)||(tt>=1.)) return(0);
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if ((ttt<0.)||(ttt>=1.)) return(0);
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return(1);
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}
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