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mesh_sphere_intersector_tmpl.hh
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mesh_sphere_intersector_tmpl.hh
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/**
* Copyright (©) 2015-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MESH_SPHERE_INTERSECTOR_TMPL_HH_
#define AKANTU_MESH_SPHERE_INTERSECTOR_TMPL_HH_
#include "aka_common.hh"
#include "mesh_geom_common.hh"
#include "mesh_sphere_intersector.hh"
#include "tree_type_helper.hh"
namespace akantu {
template <Int dim, ElementType type>
MeshSphereIntersector<dim, type>::MeshSphereIntersector(Mesh & mesh)
: parent_type(mesh), tol_intersection_on_node(1e-10) {
#if defined(AKANTU_IGFEM)
if constexpr ((type == _triangle_3) or (type == _igfem_triangle_4) or
(type == _igfem_triangle_5)) {
this->nb_seg_by_el = 3;
} else {
AKANTU_ERROR("Not ready for mesh type " << type);
}
#else
if (type != _triangle_3) {
AKANTU_ERROR("Not ready for mesh type " << type);
}
#endif
// initialize the intersection pointsss array with the spatial dimension
this->intersection_points = new Array<Real>(0, dim);
// A maximum is set to the number of intersection nodes per element to limit
// the size of new_node_per_elem: 2 in 2D and 4 in 3D
this->new_node_per_elem = new Array<UInt>(0, 1 + 4 * (dim - 1));
}
template <Int dim, ElementType type>
MeshSphereIntersector<dim, type>::~MeshSphereIntersector() {
delete this->new_node_per_elem;
delete this->intersection_points;
}
template <Int dim, ElementType type>
void MeshSphereIntersector<dim, type>::constructData(GhostType ghost_type) {
this->new_node_per_elem->resize(this->mesh.getNbElement(type, ghost_type));
this->new_node_per_elem->clear();
MeshGeomIntersector<dim, type, Line_arc<SK>, SK::Sphere_3, SK>::constructData(
ghost_type);
}
template <Int dim, ElementType type>
void MeshSphereIntersector<dim, type>::computeMeshQueryIntersectionPoint(
const SK::Sphere_3 & query, Int nb_old_nodes) {
/// function to replace computeIntersectionQuery in a more generic geometry
/// module version
// The newNodeEvent is not send from this method who only compute the
// intersection points
AKANTU_DEBUG_IN();
auto & nodes = this->mesh.getNodes();
auto nb_node = nodes.size() + this->intersection_points->size();
// Tolerance for proximity checks should be defined by user
Real global_tolerance = Math::getTolerance();
Math::setTolerance(tol_intersection_on_node);
using sk_inter_res = boost::variant<pair_type>;
// loop on the primitives (segments)
for (auto && primitive : this->factory.getPrimitiveList()) {
std::list<sk_inter_res> s_results;
CGAL::intersection(primitive, query, std::back_inserter(s_results));
if (s_results.size() != 1) { // not just one point
continue;
}
auto * pair = boost::get<pair_type>(&s_results.front());
if (not pair and pair->second != 1) {
continue;
}
// the intersection point written as a vector
Vector<Real> new_node(dim, 0.0);
cgal::Cartesian::Point_3 point(CGAL::to_double(pair->first.x()),
CGAL::to_double(pair->first.y()),
CGAL::to_double(pair->first.z()));
for (Int i = 0; i < dim; i++) {
new_node(i) = point[i];
}
/// boolean to decide wheter intersection point is on a standard node
/// of the mesh or not
bool is_on_mesh = false;
/// boolean to decide if this intersection point has been already
/// computed for a neighbor element
bool is_new = true;
// check if intersection point has already been computed
auto old_node_id = nb_old_nodes;
// check if we already compute this intersection and add it as a node
// for a neighbor element of another type
auto node_view = make_view<dim>(nodes);
// loop on the nodes from nb_old_nodes
for (auto && existing_node :
range(node_view.begin() + nb_old_nodes, node_view.end())) {
if (new_node.isApprox(existing_node)) {
is_new = false;
break;
}
++old_node_id;
}
if (is_new) {
for (auto && intersection_point :
make_view<dim>(*this->intersection_points)) {
if (new_node.isApprox(intersection_point)) {
is_new = false;
break;
}
}
}
// get the initial and final points of the primitive (segment) and
// write them as vectors
cgal::Cartesian::Point_3 source_cgal(
CGAL::to_double(primitive.source().x()),
CGAL::to_double(primitive.source().y()),
CGAL::to_double(primitive.source().z()));
cgal::Cartesian::Point_3 target_cgal(
CGAL::to_double(primitive.target().x()),
CGAL::to_double(primitive.target().y()),
CGAL::to_double(primitive.target().z()));
Vector<Real, dim> source, target;
for (Int i = 0; i < dim; i++) {
source(i) = source_cgal[i];
target(i) = target_cgal[i];
}
// Check if we are close from a node of the primitive (segment)
if (source.isApprox(new_node) or target.isApprox(new_node)) {
is_on_mesh = true;
is_new = false;
}
// if the intersection point is a new one add it to the
// list
if (is_new) {
this->intersection_points->push_back(new_node);
nb_node++;
}
// deduce the element id
auto element_id = primitive.id();
// fill the new_node_per_elem array
if (not is_on_mesh) { // if the node is not on a mesh node
auto & nb_new_nodes_per_el = (*this->new_node_per_elem)(element_id, 0);
nb_new_nodes_per_el += 1;
AKANTU_DEBUG_ASSERT(
2 * nb_new_nodes_per_el < this->new_node_per_elem->getNbComponent(),
"You might have to interface crossing the same material");
(*this->new_node_per_elem)(element_id, (2 * nb_new_nodes_per_el) - 1) =
old_node_id;
(*this->new_node_per_elem)(element_id, 2 * nb_new_nodes_per_el) =
primitive.segId();
}
}
Math::setTolerance(global_tolerance);
AKANTU_DEBUG_OUT();
}
} // namespace akantu
#endif // AKANTU_MESH_SPHERE_INTERSECTOR_TMPL_HH_

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