d4/da9/get__signed__distance__from__point__to__plane_8c_source.html

00001 // Function written by Spandana Makeneni, 2011
00002 #include <glylib.h>
00003 //#include <mylib.h>
00004 //#include <molecules.h>
00005 /************** get_distance_from_point_to_plane() ******************/
00006 double get_signed_distance_from_point_to_plane(plane p, coord_3D pt ){
00007
00008 double sum, sqroot, d;
00009 //printf("%f %f %f\n",pt.i,pt.j,pt.k);
00010 //printf("%f %f %f\n",p.A,p.B,p.C);
00011 //printf("%f %f %f\n",p.A*pt.i,p.B*pt.j,p.C*pt.k);
00012 sum=(p.A)*(pt.i) + (p.B)*(pt.j) + (p.C)*(pt.k)+p.D;
00013 //printf(" sum is %f\n",sum);
00014 sqroot=sqrt(p.A*p.A + p.B*p.B + p.C*p.C);
00015 d=sum/sqroot;
00016
00017 //get absolute value
00018 return d;
00019 }