d1/db9/get__plane_8c_source.html

00001 // Function written by B. Lachele Foley, 2007
00002 #include <mylib.h>
00003 #include <molecules.h>
00004 //#include "../inc/mylib.h"
00005 //#include "../inc/molecules.h"
00006 /************** get_plane() ******************/
00007 /* this finds the plane defined by 3 coord_3D structs */
00008 plane get_plane(coord_3D one, coord_3D two, coord_3D three){
00009 plane p;
00010 p.A=(two.j-one.j)*(three.k-one.k)-(three.j-one.j)*(two.k-one.k);
00011 p.B=(two.k-one.k)*(three.i-one.i)-(three.k-one.k)*(two.i-one.i);
00012 p.C=(two.i-one.i)*(three.j-one.j)-(three.i-one.i)*(two.j-one.j);
00013 p.D=-(p.A*one.i) - (p.B*one.j) - (p.C*one.k);
00014 //dprint_coord_3D(one);
00015 //dprint_coord_3D(two);
00016 //dprint_coord_3D(three);
00017 //dprint_plane(&p);
00018 return p;
00019 }