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meepgeom.cpp
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/* Copyright (C) 2005-2019 Massachusetts Institute of Technology
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details. %
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software Foundation,
% Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <vector>
#include "meepgeom.hpp"
namespace meep_geom {
#define master_printf meep::master_printf
/***************************************************************/
/* global variables for default material */
/***************************************************************/
material_data vacuum_material_data;
material_type vacuum = &vacuum_material_data;
void check_offdiag(medium_struct *m) {
if (m->epsilon_offdiag.x.im != 0 || m->epsilon_offdiag.y.im != 0 ||
m->epsilon_offdiag.z.im != 0 || m->mu_offdiag.x.im != 0 || m->mu_offdiag.y.im != 0 ||
m->mu_offdiag.z.im != 0) {
meep::abort("Found non-zero imaginary part of epsilon or mu offdiag.\n");
}
}
bool susceptibility_equal(const susceptibility &s1, const susceptibility &s2) {
return (vector3_equal(s1.sigma_diag, s2.sigma_diag) &&
vector3_equal(s1.sigma_offdiag, s2.sigma_offdiag) && s1.frequency == s2.frequency &&
s1.gamma == s2.gamma && s1.noise_amp == s2.noise_amp && s1.drude == s2.drude &&
s1.is_file == s2.is_file);
}
bool susceptibility_list_equal(const susceptibility_list &s1, const susceptibility_list &s2) {
if (s1.num_items != s2.num_items) return false;
for (int i = 0; i < s1.num_items; ++i)
if (!susceptibility_equal(s1.items[i], s2.items[i])) return false;
return true;
}
bool medium_struct_equal(const medium_struct *m1, const medium_struct *m2) {
return (vector3_equal(m1->epsilon_diag, m2->epsilon_diag) &&
cvector3_equal(m1->epsilon_offdiag, m2->epsilon_offdiag) &&
vector3_equal(m1->mu_diag, m2->mu_diag) &&
cvector3_equal(m1->mu_offdiag, m2->mu_offdiag) &&
vector3_equal(m1->E_chi2_diag, m2->E_chi2_diag) &&
vector3_equal(m1->E_chi3_diag, m2->E_chi3_diag) &&
vector3_equal(m1->H_chi2_diag, m2->H_chi2_diag) &&
vector3_equal(m1->D_conductivity_diag, m2->D_conductivity_diag) &&
vector3_equal(m1->B_conductivity_diag, m2->B_conductivity_diag) &&
susceptibility_list_equal(m1->E_susceptibilities, m2->E_susceptibilities) &&
susceptibility_list_equal(m1->H_susceptibilities, m2->H_susceptibilities));
}
// garbage collection for susceptibility_list structures.
// Assumes that the 'items' field, if non-empty, was allocated using new[];
// this is automatically the case for python code but is not checked
// for c++ code and will yield runtime errors if a user's user_material_func
// uses e.g. malloc() instead.
static void susceptibility_list_gc(susceptibility_list *sl) {
if (!sl || !(sl->num_items)) return;
delete[] sl->items;
sl->items = NULL;
sl->num_items = 0;
}
// garbage collection for material structures: called to deallocate memory
// allocated for susceptibilities in user-defined materials.
void material_gc(material_type m) {
if (!m || m->which_subclass != material_data::MATERIAL_USER) return;
susceptibility_list_gc(&(m->medium.E_susceptibilities));
susceptibility_list_gc(&(m->medium.H_susceptibilities));
}
bool material_type_equal(const material_type m1, const material_type m2) {
if (m1 == m2) return true;
if (m1->which_subclass != m2->which_subclass) return false;
switch (m1->which_subclass) {
case material_data::MATERIAL_FILE:
case material_data::PERFECT_METAL: return true;
case material_data::MATERIAL_USER:
return m1->user_func == m2->user_func && m1->user_data == m2->user_data;
case material_data::MEDIUM: return medium_struct_equal(&(m1->medium), &(m2->medium));
default: return false;
}
}
/***************************************************************/
/***************************************************************/
/***************************************************************/
typedef struct {
double m00, m01, m02, m11, m12, m22;
} symmetric_matrix;
/* rotate A by a unitary (real) rotation matrix R:
RAR = transpose(R) * A * R
*/
void sym_matrix_rotate(symmetric_matrix *RAR, const symmetric_matrix *A_, const double R[3][3]) {
int i, j;
double A[3][3], AR[3][3];
A[0][0] = A_->m00;
A[1][1] = A_->m11;
A[2][2] = A_->m22;
A[0][1] = A[1][0] = A_->m01;
A[0][2] = A[2][0] = A_->m02;
A[1][2] = A[2][1] = A_->m12;
for (i = 0; i < 3; ++i)
for (j = 0; j < 3; ++j)
AR[i][j] = A[i][0] * R[0][j] + A[i][1] * R[1][j] + A[i][2] * R[2][j];
for (i = 0; i < 3; ++i)
for (j = i; j < 3; ++j)
A[i][j] = R[0][i] * AR[0][j] + R[1][i] * AR[1][j] + R[2][i] * AR[2][j];
RAR->m00 = A[0][0];
RAR->m11 = A[1][1];
RAR->m22 = A[2][2];
RAR->m01 = A[0][1];
RAR->m02 = A[0][2];
RAR->m12 = A[1][2];
}
/* Set Vinv = inverse of V, where both V and Vinv are real-symmetric matrices.*/
void sym_matrix_invert(symmetric_matrix *Vinv, const symmetric_matrix *V) {
double m00 = V->m00, m11 = V->m11, m22 = V->m22;
double m01 = V->m01, m02 = V->m02, m12 = V->m12;
if (m01 == 0.0 && m02 == 0.0 && m12 == 0.0) {
/* optimize common case of a diagonal matrix: */
Vinv->m00 = 1.0 / m00;
Vinv->m11 = 1.0 / m11;
Vinv->m22 = 1.0 / m22;
Vinv->m01 = Vinv->m02 = Vinv->m12 = 0.0;
} else {
double detinv;
/* compute the determinant: */
detinv = m00 * m11 * m22 - m02 * m11 * m02 + 2.0 * m01 * m12 * m02 - m01 * m01 * m22 -
m12 * m12 * m00;
if (detinv == 0.0) meep::abort("singular 3x3 matrix");
detinv = 1.0 / detinv;
Vinv->m00 = detinv * (m11 * m22 - m12 * m12);
Vinv->m11 = detinv * (m00 * m22 - m02 * m02);
Vinv->m22 = detinv * (m11 * m00 - m01 * m01);
Vinv->m02 = detinv * (m01 * m12 - m11 * m02);
Vinv->m01 = detinv * (m12 * m02 - m01 * m22);
Vinv->m12 = detinv * (m01 * m02 - m00 * m12);
}
}
/* Returns whether or not V is positive-definite. */
int sym_matrix_positive_definite(symmetric_matrix *V) {
double det2, det3;
double m00 = V->m00, m11 = V->m11, m22 = V->m22;
#if defined(WITH_HERMITIAN_EPSILON)
scalar_complex m01 = V->m01, m02 = V->m02, m12 = V->m12;
det2 = m00 * m11 - CSCALAR_NORMSQR(m01);
det3 = det2 * m22 - m11 * CSCALAR_NORMSQR(m02) - CSCALAR_NORMSQR(m12) * m00 +
2.0 * ((m01.re * m12.re - m01.im * m12.im) * m02.re +
(m01.re * m12.im + m01.im * m12.re) * m02.im);
#else /* real matrix */
double m01 = V->m01, m02 = V->m02, m12 = V->m12;
det2 = m00 * m11 - m01 * m01;
det3 = det2 * m22 - m02 * m11 * m02 + 2.0 * m01 * m12 * m02 - m12 * m12 * m00;
#endif /* real matrix */
return (m00 > 0.0 && det2 > 0.0 && det3 > 0.0);
}
/***************************************************************/
/***************************************************************/
/***************************************************************/
static meep::ndim dim = meep::D3;
void set_dimensions(int dims) {
if (dims == CYLINDRICAL) {
dimensions = 2;
dim = meep::Dcyl;
} else {
dimensions = dims;
dim = meep::ndim(dims - 1);
}
}
vector3 vec_to_vector3(const meep::vec &pt) {
vector3 v3;
switch (pt.dim) {
case meep::D1:
v3.x = 0;
v3.y = 0;
v3.z = pt.z();
break;
case meep::D2:
v3.x = pt.x();
v3.y = pt.y();
v3.z = 0;
break;
case meep::D3:
v3.x = pt.x();
v3.y = pt.y();
v3.z = pt.z();
break;
case meep::Dcyl:
v3.x = pt.r();
v3.y = 0;
v3.z = pt.z();
break;
}
return v3;
}
meep::vec vector3_to_vec(const vector3 v3) {
switch (dim) {
case meep::D1: return meep::vec(v3.z);
case meep::D2: return meep::vec(v3.x, v3.y);
case meep::D3: return meep::vec(v3.x, v3.y, v3.z);
case meep::Dcyl: return meep::veccyl(v3.x, v3.z);
default: meep::abort("unknown dimensionality in vector3_to_vec");
}
}
geom_box gv2box(const meep::volume &v) {
geom_box box;
box.low = vec_to_vector3(v.get_min_corner());
box.high = vec_to_vector3(v.get_max_corner());
return box;
}
bool is_variable(material_type mt) { return (mt->which_subclass == material_data::MATERIAL_USER); }
bool is_variable(void *md) { return is_variable((material_type)md); }
bool is_file(material_type md) { return (md->which_subclass == material_data::MATERIAL_FILE); }
bool is_file(void *md) { return is_file((material_type)md); }
bool is_medium(material_type md, medium_struct **m) {
if (md->which_subclass == material_data::MEDIUM) {
*m = &(md->medium);
return true;
};
return false;
}
bool is_medium(void *md, medium_struct **m) { return is_medium((material_type)md, m); }
bool is_metal(meep::field_type ft, const material_type *material) {
material_data *md = *material;
if (ft == meep::E_stuff) switch (md->which_subclass) {
case material_data::MEDIUM:
return (md->medium.epsilon_diag.x < 0 || md->medium.epsilon_diag.y < 0 ||
md->medium.epsilon_diag.z < 0);
case material_data::PERFECT_METAL: return true;
default: meep::abort("unknown material type");
}
else
switch (md->which_subclass) {
case material_data::MEDIUM:
return (md->medium.mu_diag.x < 0 || md->medium.mu_diag.y < 0 || md->medium.mu_diag.z < 0);
case material_data::PERFECT_METAL:
return false; // is an electric conductor, but not a magnetic conductor
default: meep::abort("unknown material type");
}
}
// return material of the point p from the file (assumed already read)
void epsilon_file_material(material_data *md, vector3 p) {
default_material = (void *)md;
if (md->which_subclass != material_data::MATERIAL_FILE)
meep::abort("epsilon-input-file only works with a type=file default-material");
if (!(md->epsilon_data)) return;
medium_struct *mm = &(md->medium);
double rx =
geometry_lattice.size.x == 0 ? 0 : 0.5 + (p.x - geometry_center.x) / geometry_lattice.size.x;
double ry =
geometry_lattice.size.y == 0 ? 0 : 0.5 + (p.y - geometry_center.y) / geometry_lattice.size.y;
double rz =
geometry_lattice.size.z == 0 ? 0 : 0.5 + (p.z - geometry_center.z) / geometry_lattice.size.z;
mm->epsilon_diag.x = mm->epsilon_diag.y = mm->epsilon_diag.z =
meep::linear_interpolate(rx, ry, rz, md->epsilon_data, md->epsilon_dims[0],
md->epsilon_dims[1], md->epsilon_dims[2], 1);
mm->epsilon_offdiag.x.re = mm->epsilon_offdiag.y.re = mm->epsilon_offdiag.z.re = 0;
}
struct pol {
susceptibility user_s;
struct pol *next;
};
// structure to hold a conductivity profile (for scalar absorbing layers)
struct cond_profile {
double L; // thickness
int N; // number of points prof[n] from 0..N corresponding to 0..L
double *prof; // (NULL if none)
};
class geom_epsilon : public meep::material_function {
geometric_object_list geometry;
geom_box_tree geometry_tree;
geom_box_tree restricted_tree;
cond_profile cond[5][2]; // [direction][side]
public:
geom_epsilon(geometric_object_list g, material_type_list mlist, const meep::volume &v);
virtual ~geom_epsilon();
virtual void set_cond_profile(meep::direction, meep::boundary_side, double L, double dx,
double (*prof)(int, double *, void *), void *, double R);
virtual void set_volume(const meep::volume &v);
virtual void unset_volume(void);
bool has_chi(meep::component c, int p);
virtual bool has_chi3(meep::component c);
virtual bool has_chi2(meep::component c);
double chi(meep::component c, const meep::vec &r, int p);
virtual double chi3(meep::component c, const meep::vec &r);
virtual double chi2(meep::component c, const meep::vec &r);
virtual bool has_mu();
virtual bool has_conductivity(meep::component c);
virtual double conductivity(meep::component c, const meep::vec &r);
virtual double chi1p1(meep::field_type ft, const meep::vec &r);
virtual void eff_chi1inv_row(meep::component c, double chi1inv_row[3], const meep::volume &v,
double tol, int maxeval);
void eff_chi1inv_matrix(meep::component c, symmetric_matrix *chi1inv_matrix,
const meep::volume &v, double tol, int maxeval);
void fallback_chi1inv_row(meep::component c, double chi1inv_row[3], const meep::volume &v,
double tol, int maxeval);
virtual void sigma_row(meep::component c, double sigrow[3], const meep::vec &r);
void add_susceptibilities(meep::structure *s);
void add_susceptibilities(meep::field_type ft, meep::structure *s);
static bool verbose;
private:
void get_material_pt(material_type &material, const meep::vec &r);
material_type_list extra_materials;
pol *current_pol;
};
/***********************************************************************/
bool geom_epsilon::verbose = false;
geom_epsilon::geom_epsilon(geometric_object_list g, material_type_list mlist,
const meep::volume &v) {
geometry = g; // don't bother making a copy, only used in one place
extra_materials = mlist;
current_pol = NULL;
FOR_DIRECTIONS(d) FOR_SIDES(b) { cond[d][b].prof = NULL; }
if (meep::am_master()) {
for (int i = 0; i < geometry.num_items; ++i) {
display_geometric_object_info(5, geometry.items[i]);
medium_struct *mm;
if (is_medium(geometry.items[i].material, &mm)) {
check_offdiag(mm);
printf("%*sdielectric constant epsilon diagonal "
"= (%g,%g,%g)\n",
5 + 5, "", mm->epsilon_diag.x, mm->epsilon_diag.y, mm->epsilon_diag.z);
}
}
}
geom_fix_object_list(geometry);
geom_box box = gv2box(v);
geometry_tree = create_geom_box_tree0(geometry, box);
if (verbose && meep::am_master()) {
printf("Geometric-object bounding-box tree:\n");
display_geom_box_tree(5, geometry_tree);
int tree_depth, tree_nobjects;
geom_box_tree_stats(geometry_tree, &tree_depth, &tree_nobjects);
master_printf("Geometric object tree has depth %d "
"and %d object nodes (vs. %d actual objects)\n",
tree_depth, tree_nobjects, geometry.num_items);
}
restricted_tree = geometry_tree;
}
geom_epsilon::~geom_epsilon() {
unset_volume();
destroy_geom_box_tree(geometry_tree);
FOR_DIRECTIONS(d) FOR_SIDES(b) {
if (cond[d][b].prof) delete[] cond[d][b].prof;
}
}
void geom_epsilon::set_cond_profile(meep::direction dir, meep::boundary_side side, double L,
double dx, double (*P)(int, double *, void *), void *data,
double R) {
if (cond[dir][side].prof) delete[] cond[dir][side].prof;
int N = int(L / dx + 0.5);
cond[dir][side].L = L;
cond[dir][side].N = N;
double *prof = cond[dir][side].prof = new double[N + 1];
double umin = 0, umax = 1, esterr;
int errflag;
double prof_int =
adaptive_integration(P, &umin, &umax, 1, data, 1e-9, 1e-4, 50000, &esterr, &errflag);
double prefac = (-log(R)) / (4 * L * prof_int);
for (int i = 0; i <= N; ++i) {
double u = double(i) / N;
prof[i] = prefac * P(1, &u, data);
}
}
void geom_epsilon::unset_volume(void) {
if (restricted_tree != geometry_tree) {
destroy_geom_box_tree(restricted_tree);
restricted_tree = geometry_tree;
}
}
void geom_epsilon::set_volume(const meep::volume &v) {
unset_volume();
geom_box box = gv2box(v);
restricted_tree = create_geom_box_tree0(geometry, box);
}
static void material_epsmu(meep::field_type ft, material_type material, symmetric_matrix *epsmu,
symmetric_matrix *epsmu_inv) {
material_data *md = material;
if (ft == meep::E_stuff) switch (md->which_subclass) {
case material_data::MEDIUM:
case material_data::MATERIAL_FILE:
case material_data::MATERIAL_USER:
epsmu->m00 = md->medium.epsilon_diag.x;
epsmu->m11 = md->medium.epsilon_diag.y;
epsmu->m22 = md->medium.epsilon_diag.z;
epsmu->m01 = md->medium.epsilon_offdiag.x.re;
epsmu->m02 = md->medium.epsilon_offdiag.y.re;
epsmu->m12 = md->medium.epsilon_offdiag.z.re;
sym_matrix_invert(epsmu_inv, epsmu);
break;
case material_data::PERFECT_METAL:
epsmu->m00 = -meep::infinity;
epsmu->m11 = -meep::infinity;
epsmu->m22 = -meep::infinity;
epsmu_inv->m00 = -0.0;
epsmu_inv->m11 = -0.0;
epsmu_inv->m22 = -0.0;
epsmu->m01 = epsmu->m02 = epsmu->m12 = 0.0;
epsmu_inv->m01 = epsmu_inv->m02 = epsmu_inv->m12 = 0.0;
break;
default: meep::abort("unknown material type");
}
else
switch (md->which_subclass) {
case material_data::MEDIUM:
case material_data::MATERIAL_FILE:
case material_data::MATERIAL_USER:
epsmu->m00 = md->medium.mu_diag.x;
epsmu->m11 = md->medium.mu_diag.y;
epsmu->m22 = md->medium.mu_diag.z;
epsmu->m01 = md->medium.mu_offdiag.x.re;
epsmu->m02 = md->medium.mu_offdiag.y.re;
epsmu->m12 = md->medium.mu_offdiag.z.re;
sym_matrix_invert(epsmu_inv, epsmu);
break;
case material_data::PERFECT_METAL:
epsmu->m00 = 1.0;
epsmu->m11 = 1.0;
epsmu->m22 = 1.0;
epsmu_inv->m00 = 1.0;
epsmu_inv->m11 = 1.0;
epsmu_inv->m22 = 1.0;
epsmu->m01 = epsmu->m02 = epsmu->m12 = 0.0;
epsmu_inv->m01 = epsmu_inv->m02 = epsmu_inv->m12 = 0.0;
break;
default: meep::abort("unknown material type");
}
}
// the goal of this routine is to fill in the 'medium' field
// within the material structure as appropriate for the
// material properties at r.
void geom_epsilon::get_material_pt(material_type &material, const meep::vec &r) {
vector3 p = vec_to_vector3(r);
boolean inobject;
material =
(material_type)material_of_unshifted_point_in_tree_inobject(p, restricted_tree, &inobject);
material_data *md = material;
switch (md->which_subclass) {
// material read from file: interpolate to get properties at r
case material_data::MATERIAL_FILE:
if (md->epsilon_data)
epsilon_file_material(md, p);
else
material = (material_type)default_material;
return;
// material specified by user-supplied function: call user
// function to get properties at r.
// Note that we initialize the medium to vacuum, so that
// the user's function only needs to fill in whatever is
// different from vacuum.
case material_data::MATERIAL_USER:
md->medium = medium_struct();
md->user_func(p, md->user_data, &(md->medium));
check_offdiag(&md->medium);
return;
// position-independent material or metal: there is nothing to do
case material_data::MEDIUM:
case material_data::PERFECT_METAL: return;
default: meep::abort("unknown material type");
};
}
// returns trace of the tensor diagonal
double geom_epsilon::chi1p1(meep::field_type ft, const meep::vec &r) {
symmetric_matrix chi1p1, chi1p1_inv;
#ifdef DEBUG
vector3 p = vec_to_vector3(r);
if (p.x < restricted_tree->b.low.x || p.y < restricted_tree->b.low.y ||
p.z < restricted_tree->b.low.z || p.x > restricted_tree->b.high.x ||
p.y > restricted_tree->b.high.y || p.z > restricted_tree->b.high.z)
meep::abort("invalid point (%g,%g,%g)\n", p.x, p.y, p.z);
#endif
material_type material;
get_material_pt(material, r);
material_epsmu(ft, material, &chi1p1, &chi1p1_inv);
material_gc(material);
return (chi1p1.m00 + chi1p1.m11 + chi1p1.m22) / 3;
}
/* Find frontmost object in v, along with the constant material behind it.
Returns false if material behind the object is not constant.
Requires moderately horrifying logic to figure things out properly,
stolen from MPB. */
static bool get_front_object(const meep::volume &v, geom_box_tree geometry_tree, vector3 &pcenter,
const geometric_object **o_front, vector3 &shiftby_front,
material_type &mat_front, material_type &mat_behind) {
vector3 p;
const geometric_object *o1 = 0, *o2 = 0;
vector3 shiftby1 = {0, 0, 0}, shiftby2 = {0, 0, 0};
geom_box pixel;
material_type mat1 = vacuum, mat2 = vacuum;
int id1 = -1, id2 = -1;
const int num_neighbors[3] = {3, 5, 9};
const int neighbors[3][9][3] = {{{0, 0, 0},
{0, 0, -1},
{0, 0, 1},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0}},
{{0, 0, 0},
{-1, -1, 0},
{1, 1, 0},
{-1, 1, 0},
{1, -1, 0},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0},
{0, 0, 0}},
{{0, 0, 0},
{1, 1, 1},
{1, 1, -1},
{1, -1, 1},
{1, -1, -1},
{-1, 1, 1},
{-1, 1, -1},
{-1, -1, 1},
{-1, -1, -1}}};
pixel = gv2box(v);
pcenter = p = vec_to_vector3(v.center());
double d1, d2, d3;
d1 = (pixel.high.x - pixel.low.x) * 0.5;
d2 = (pixel.high.y - pixel.low.y) * 0.5;
d3 = (pixel.high.z - pixel.low.z) * 0.5;
for (int i = 0; i < num_neighbors[dimensions - 1]; ++i) {
const geometric_object *o;
material_type mat;
vector3 q, shiftby;
int id;
q.x = p.x + neighbors[dimensions - 1][i][0] * d1;
q.y = p.y + neighbors[dimensions - 1][i][1] * d2;
q.z = p.z + neighbors[dimensions - 1][i][2] * d3;
o = object_of_point_in_tree(q, geometry_tree, &shiftby, &id);
if ((id == id1 && vector3_equal(shiftby, shiftby1)) ||
(id == id2 && vector3_equal(shiftby, shiftby2)))
continue;
mat = (material_type)default_material;
if (o) {
material_data *md = (material_data *)o->material;
if (md->which_subclass != material_data::MATERIAL_FILE) mat = md;
}
if (id1 == -1) {
o1 = o;
shiftby1 = shiftby;
id1 = id;
mat1 = mat;
} else if (id2 == -1 ||
((id >= id1 && id >= id2) && (id1 == id2 || material_type_equal(mat1, mat2)))) {
o2 = o;
shiftby2 = shiftby;
id2 = id;
mat2 = mat;
} else if (!(id1 < id2 && (id1 == id || material_type_equal(mat1, mat))) &&
!(id2 < id1 && (id2 == id || material_type_equal(mat2, mat))))
return false;
}
// CHECK(id1 > -1, "bug in object_of_point_in_tree?");
if (id2 == -1) { /* only one nearby object/material */
id2 = id1;
o2 = o1;
mat2 = mat1;
shiftby2 = shiftby1;
}
if ((o1 && is_variable(o1->material)) || (o2 && is_variable(o2->material)) ||
((is_variable(default_material) || is_file(default_material)) &&
(!o1 || is_file(o1->material) || !o2 || is_file(o2->material))))
return false;
if (id1 >= id2) {
*o_front = o1;
shiftby_front = shiftby1;
mat_front = mat1;
if (id1 == id2)
mat_behind = mat1;
else
mat_behind = mat2;
}
if (id2 > id1) {
*o_front = o2;
shiftby_front = shiftby2;
mat_front = mat2;
mat_behind = mat1;
}
return true;
}
void geom_epsilon::eff_chi1inv_row(meep::component c, double chi1inv_row[3], const meep::volume &v,
double tol, int maxeval) {
symmetric_matrix meps_inv;
eff_chi1inv_matrix(c, &meps_inv, v, tol, maxeval);
switch (component_direction(c)) {
case meep::X:
case meep::R:
chi1inv_row[0] = meps_inv.m00;
chi1inv_row[1] = meps_inv.m01;
chi1inv_row[2] = meps_inv.m02;
break;
case meep::Y:
case meep::P:
chi1inv_row[0] = meps_inv.m01;
chi1inv_row[1] = meps_inv.m11;
chi1inv_row[2] = meps_inv.m12;
break;
case meep::Z:
chi1inv_row[0] = meps_inv.m02;
chi1inv_row[1] = meps_inv.m12;
chi1inv_row[2] = meps_inv.m22;
break;
case meep::NO_DIRECTION: chi1inv_row[0] = chi1inv_row[1] = chi1inv_row[2] = 0; break;
}
}
void geom_epsilon::eff_chi1inv_matrix(meep::component c, symmetric_matrix *chi1inv_matrix,
const meep::volume &v, double tol, int maxeval) {
const geometric_object *o;
material_type mat, mat_behind;
symmetric_matrix meps;
vector3 p, shiftby, normal;
if (maxeval == 0 || !get_front_object(v, geometry_tree, p, &o, shiftby, mat, mat_behind)) {
noavg:
get_material_pt(mat, v.center());
trivial:
material_epsmu(meep::type(c), mat, &meps, chi1inv_matrix);
material_gc(mat);
return;
}
// FIXME: reimplement support for fallback integration, without
// messing up anisotropic support
// if (!get_front_object(v, geometry_tree,
// p, &o, shiftby, mat, mat_behind)) {
// fallback_chi1inv_row(c, chi1inv_row, v, tol, maxeval);
// return;
// }
/* check for trivial case of only one object/material */
if (material_type_equal(mat, mat_behind)) goto trivial;
// it doesn't make sense to average metals (electric or magnetic)
if (is_metal(meep::type(c), &mat) || is_metal(meep::type(c), &mat_behind)) goto noavg;
normal = unit_vector3(normal_to_fixed_object(vector3_minus(p, shiftby), *o));
if (normal.x == 0 && normal.y == 0 && normal.z == 0)
goto noavg; // couldn't get normal vector for this point, punt
geom_box pixel = gv2box(v);
pixel.low = vector3_minus(pixel.low, shiftby);
pixel.high = vector3_minus(pixel.high, shiftby);
double fill = box_overlap_with_object(pixel, *o, tol, maxeval);
material_epsmu(meep::type(c), mat, &meps, chi1inv_matrix);
symmetric_matrix eps2, epsinv2;
symmetric_matrix eps1, delta;
double Rot[3][3];
material_epsmu(meep::type(c), mat_behind, &eps2, &epsinv2);
eps1 = meps;
Rot[0][0] = normal.x;
Rot[1][0] = normal.y;
Rot[2][0] = normal.z;
if (fabs(normal.x) > 1e-2 || fabs(normal.y) > 1e-2) {
Rot[0][2] = normal.y;
Rot[1][2] = -normal.x;
Rot[2][2] = 0;
} else { /* n is not parallel to z direction, use (x x n) instead */
Rot[0][2] = 0;
Rot[1][2] = -normal.z;
Rot[2][2] = normal.y;
}
{ /* normalize second column */
double s = Rot[0][2] * Rot[0][2] + Rot[1][2] * Rot[1][2] + Rot[2][2] * Rot[2][2];
s = 1.0 / sqrt(s);
Rot[0][2] *= s;
Rot[1][2] *= s;
Rot[2][2] *= s;
}
/* 1st column is 2nd column x 0th column */
Rot[0][1] = Rot[1][2] * Rot[2][0] - Rot[2][2] * Rot[1][0];
Rot[1][1] = Rot[2][2] * Rot[0][0] - Rot[0][2] * Rot[2][0];
Rot[2][1] = Rot[0][2] * Rot[1][0] - Rot[1][2] * Rot[0][0];
/* rotate epsilon tensors to surface parallel/perpendicular axes */
sym_matrix_rotate(&eps1, &eps1, Rot);
sym_matrix_rotate(&eps2, &eps2, Rot);
#define AVG (fill * (EXPR(eps1)) + (1 - fill) * (EXPR(eps2)))
#define SQR(x) ((x) * (x))
#define EXPR(eps) (-1 / eps.m00)
delta.m00 = AVG;
#undef EXPR
#define EXPR(eps) (eps.m11 - SQR(eps.m01) / eps.m00)
delta.m11 = AVG;
#undef EXPR
#define EXPR(eps) (eps.m22 - SQR(eps.m02) / eps.m00)
delta.m22 = AVG;
#undef EXPR
#define EXPR(eps) (eps.m01 / eps.m00)
delta.m01 = AVG;
#undef EXPR
#define EXPR(eps) (eps.m02 / eps.m00)
delta.m02 = AVG;
#undef EXPR
#define EXPR(eps) (eps.m12 - eps.m02 * eps.m01 / eps.m00)
delta.m12 = AVG;
#undef EXPR
meps.m00 = -1 / delta.m00;
meps.m11 = delta.m11 - SQR(delta.m01) / delta.m00;
meps.m22 = delta.m22 - SQR(delta.m02) / delta.m00;
meps.m01 = -delta.m01 / delta.m00;
meps.m02 = -delta.m02 / delta.m00;
meps.m12 = delta.m12 - (delta.m02 * delta.m01) / delta.m00;
#undef SQR
#define SWAP(a, b) \
{ \
double xxx = a; \
a = b; \
b = xxx; \
}
/* invert rotation matrix = transpose */
SWAP(Rot[0][1], Rot[1][0]);
SWAP(Rot[0][2], Rot[2][0]);
SWAP(Rot[2][1], Rot[1][2]);
sym_matrix_rotate(&meps, &meps, Rot); /* rotate back */
#undef SWAP
#ifdef DEBUG
if (!sym_matrix_positive_definite(&meps))
meep::abort("negative mean epsilon from Kottke algorithm");
#endif
sym_matrix_invert(chi1inv_matrix, &meps);
}
static int eps_ever_negative = 0;
static meep::field_type func_ft = meep::E_stuff;
#ifdef CTL_HAS_COMPLEX_INTEGRATION
static cnumber ceps_func(int n, number *x, void *geomeps_) {
geom_epsilon *geomeps = (geom_epsilon *)geomeps_;
vector3 p = {0, 0, 0};
p.x = x[0];
p.y = n > 1 ? x[1] : 0;
p.z = n > 2 ? x[2] : 0;
double s = 1;
if (dim == meep::Dcyl) {
double py = p.y;
p.y = p.z;
p.z = py;
s = p.x;
}
cnumber ret;
double ep = geomeps->chi1p1(func_ft, vector3_to_vec(p));
if (ep < 0) eps_ever_negative = 1;
ret.re = ep * s;
ret.im = s / ep;
return ret;
}
#else
static number eps_func(int n, number *x, void *geomeps_) {
geom_epsilon *geomeps = (geom_epsilon *)geomeps_;
vector3 p = {0, 0, 0};
double s = 1;
p.x = x[0];
p.y = n > 1 ? x[1] : 0;
p.z = n > 2 ? x[2] : 0;
if (dim == meep::Dcyl) {
double py = p.y;
p.y = p.z;
p.z = py;
s = p.x;
}
double ep = geomeps->chi1p1(func_ft, vector3_to_vec(p));
if (ep < 0) eps_ever_negative = 1;
return ep * s;
}
static number inveps_func(int n, number *x, void *geomeps_) {
geom_epsilon *geomeps = (geom_epsilon *)geomeps_;
vector3 p = {0, 0, 0};
double s = 1;
p.x = x[0];
p.y = n > 1 ? x[1] : 0;
p.z = n > 2 ? x[2] : 0;
if (dim == meep::Dcyl) {
double py = p.y;
p.y = p.z;
p.z = py;
s = p.x;
}
double ep = geomeps->chi1p1(func_ft, vector3_to_vec(p));
if (ep < 0) eps_ever_negative = 1;
return s / ep;
}
#endif
// fallback meaneps using libctl's adaptive cubature routine
void geom_epsilon::fallback_chi1inv_row(meep::component c, double chi1inv_row[3],
const meep::volume &v, double tol, int maxeval) {
symmetric_matrix chi1p1, chi1p1_inv;
material_type material;
get_material_pt(material, v.center());
material_epsmu(meep::type(c), material, &chi1p1, &chi1p1_inv);
material_gc(material);
if (chi1p1.m01 != 0 || chi1p1.m02 != 0 || chi1p1.m12 != 0 || chi1p1.m00 != chi1p1.m11 ||
chi1p1.m11 != chi1p1.m22 || chi1p1.m00 != chi1p1.m22) {
int rownum = meep::component_direction(c) % 3;
if (rownum == 0) {
chi1inv_row[0] = chi1p1.m00;
chi1inv_row[1] = chi1p1.m01;
chi1inv_row[2] = chi1p1.m02;
} else if (rownum == 1) {
chi1inv_row[0] = chi1p1.m01;
chi1inv_row[1] = chi1p1.m11;
chi1inv_row[2] = chi1p1.m12;
} else {
chi1inv_row[0] = chi1p1.m02;
chi1inv_row[1] = chi1p1.m12;
chi1inv_row[2] = chi1p1.m22;
}
return;
}
number esterr;
integer errflag, n;
number xmin[3], xmax[3];
vector3 gvmin, gvmax;
gvmin = vec_to_vector3(v.get_min_corner());
gvmax = vec_to_vector3(v.get_max_corner());
xmin[0] = gvmin.x;
xmax[0] = gvmax.x;
if (dim == meep::Dcyl) {
xmin[1] = gvmin.z;
xmin[2] = gvmin.y;
xmax[1] = gvmax.z;
xmax[2] = gvmax.y;
} else {
xmin[1] = gvmin.y;
xmin[2] = gvmin.z;
xmax[1] = gvmax.y;
xmax[2] = gvmax.z;
}
if (xmin[2] == xmax[2])
n = xmin[1] == xmax[1] ? 1 : 2;
else
n = 3;
double vol = 1;
for (int i = 0; i < n; ++i)
vol *= xmax[i] - xmin[i];
if (dim == meep::Dcyl) vol *= (xmin[0] + xmax[0]) * 0.5;
eps_ever_negative = 0;
func_ft = meep::type(c);
double meps, minveps;
#ifdef CTL_HAS_COMPLEX_INTEGRATION
cnumber ret = cadaptive_integration(ceps_func, xmin, xmax, n, (void *)this, 0, tol, maxeval,
&esterr, &errflag);
meps = ret.re / vol;
minveps = ret.im / vol;
#else
meps = adaptive_integration(eps_func, xmin, xmax, n, (void *)this, 0, tol, maxeval, &esterr,
&errflag) /
vol;
minveps = adaptive_integration(inveps_func, xmin, xmax, n, (void *)this, 0, tol, maxeval, &esterr,
&errflag) /
vol;
#endif
if (eps_ever_negative) // averaging negative eps causes instability
minveps = 1.0 / (meps = eps(v.center()));
{
meep::vec gradient(normal_vector(meep::type(c), v));
double n[3] = {0, 0, 0};
double nabsinv = 1.0 / meep::abs(gradient);
LOOP_OVER_DIRECTIONS(gradient.dim, k) { n[k % 3] = gradient.in_direction(k) * nabsinv; }
int rownum = meep::component_direction(c) % 3;
for (int i = 0; i < 3; ++i)
chi1inv_row[i] = n[rownum] * n[i] * (minveps - 1 / meps);
chi1inv_row[rownum] += 1 / meps;
}
}
static double get_chi3(meep::component c, const medium_struct *m) {
switch (c) {
case meep::Er:
case meep::Ex: return m->E_chi3_diag.x;
case meep::Ep:
case meep::Ey: return m->E_chi3_diag.y;
case meep::Ez: return m->E_chi3_diag.z;
case meep::Hr:
case meep::Hx: return m->H_chi3_diag.x;
case meep::Hp:
case meep::Hy: return m->H_chi3_diag.y;
case meep::Hz: return m->H_chi3_diag.z;
default: return 0;
}
}