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#include <stdio.h>
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#include <math.h>
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#include "m3d_struct.h"
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#include "m3d_const.h"
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#include "prototype.h"
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int m3d_side(float *coord,int j1,int j2,int j3,int numa,int numb,int numc)
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{
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float vn[3], v12[3], v13[3], vec[3], norme, ps1, ps2, ps3, dref ;
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int i ;
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/* normale */
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v12[0] = coord[x(j2)] - coord[x(j1)] ;
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v12[1] = coord[y(j2)] - coord[y(j1)] ;
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v12[2] = coord[z(j2)] - coord[z(j1)] ;
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dref = -1.* NORME(v12) * 0.0001 ;
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v13[0] = coord[x(j3)] - coord[x(j1)] ;
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v13[1] = coord[y(j3)] - coord[y(j1)] ;
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v13[2] = coord[z(j3)] - coord[z(j1)] ;
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vn[0] = PVECX(v12,v13) ;
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vn[1] = PVECY(v12,v13) ;
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vn[2] = PVECZ(v12,v13) ;
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norme = NORME(vn) ;
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for (i=0;i<3;i++) vn[i] = vn[i]/norme ;
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vec[0] = coord[x(numa)] - coord[x(j1)] ;
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vec[1] = coord[y(numa)] - coord[y(j1)] ;
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vec[2] = coord[z(numa)] - coord[z(j1)] ;
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ps1 = PROSCA(vn,vec) ;
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if (ps1 < dref)
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{
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vec[0] = coord[x(numb)] - coord[x(j1)] ;
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vec[1] = coord[y(numb)] - coord[y(j1)] ;
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vec[2] = coord[z(numb)] - coord[z(j1)] ;
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ps2 = PROSCA(vn,vec) ;
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if (ps2 < dref)
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{
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vec[0] = coord[x(numc)] - coord[x(j1)] ;
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vec[1] = coord[y(numc)] - coord[y(j1)] ;
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vec[2] = coord[z(numc)] - coord[z(j1)] ;
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ps3 = PROSCA(vn,vec) ;
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if (ps3 < dref) return(FAUX) ;/* pas d'intersection */
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}
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}
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return(VRAI) ;
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}
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