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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_

rAKA/src/geometry/mesh_sphere_intersector_tmpl.hhb35bf118a6e3releases/10.1007/s40571…

mesh_sphere_intersector_tmpl.hhView Options

rAKA/src/geometry/mesh_sphere_intersector_tmpl.hh
b35bf118a6e3releases/10.1007/s40571…

mesh_sphere_intersector_tmpl.hh
View Options