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lammps/src/region_plane.cpp
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region_plane.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include "math.h"
#include "stdlib.h"
#include "string.h"
#include "region_plane.h"
#include "error.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
RegPlane::RegPlane(LAMMPS *lmp, int narg, char **arg) :
Region(lmp, narg, arg)
{
options(narg-8,&arg[8]);
xp = xscale*atof(arg[2]);
yp = yscale*atof(arg[3]);
zp = zscale*atof(arg[4]);
normal[0] = xscale*atof(arg[5]);
normal[1] = yscale*atof(arg[6]);
normal[2] = zscale*atof(arg[7]);
// enforce unit normal
double rsq = normal[0]*normal[0] + normal[1]*normal[1] + normal[2]*normal[2];
if (rsq == 0.0) error->all("Illegal region plane command");
normal[0] /= sqrt(rsq);
normal[1] /= sqrt(rsq);
normal[2] /= sqrt(rsq);
// plane has no bounding box
bboxflag = 0;
cmax = 1;
contact = new Contact[cmax];
}
/* ---------------------------------------------------------------------- */
RegPlane::~RegPlane()
{
delete [] contact;
}
/* ----------------------------------------------------------------------
inside = 1 if x,y,z is on normal side of plane or on plane
inside = 0 if x,y,z is on non-normal side of plane and not on plane
x,y,z is inside if (x-xp) dot normal >= 0
------------------------------------------------------------------------- */
int RegPlane::inside(double x, double y, double z)
{
double dot = (x-xp)*normal[0] + (y-yp)*normal[1] + (z-zp)*normal[2];
if (dot >= 0.0) return 1;
return 0;
}
/* ----------------------------------------------------------------------
one contact if 0 <= x < cutoff from normal side of plane
no contact if on other side (possible if called from union/intersect)
delxyz = vector from nearest projected point on plane to x
------------------------------------------------------------------------- */
int RegPlane::surface_interior(double *x, double cutoff)
{
double dot = (x[0]-xp)*normal[0] + (x[1]-yp)*normal[1] + (x[2]-zp)*normal[2];
if (dot < cutoff && dot >= 0.0) {
contact[0].r = dot;
contact[0].delx = dot*normal[0];
contact[0].dely = dot*normal[1];
contact[0].delz = dot*normal[2];
return 1;
}
return 0;
}
/* ----------------------------------------------------------------------
one contact if 0 <= x < cutoff from non-normal side of plane
no contact if on other side (possible if called from union/intersect)
delxyz = vector from nearest projected point on plane to x
------------------------------------------------------------------------- */
int RegPlane::surface_exterior(double *x, double cutoff)
{
double dot = (x[0]-xp)*normal[0] + (x[1]-yp)*normal[1] + (x[2]-zp)*normal[2];
dot = -dot;
if (dot < cutoff && dot >= 0.0) {
contact[0].r = dot;
contact[0].delx = dot*normal[0];
contact[0].dely = dot*normal[1];
contact[0].delz = dot*normal[2];
return 1;
}
return 0;
}
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