mirror of https://github.com/CGAL/cgal
96 lines
4.2 KiB
C++
96 lines
4.2 KiB
C++
// Copyright (c) 2022 INRIA Sophia-Antipolis (France).
|
|
// All rights reserved.
|
|
//
|
|
// This file is part of CGAL (www.cgal.org).
|
|
//
|
|
// $URL$
|
|
// $Id$
|
|
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
|
|
//
|
|
// Author(s) : Julian Stahl
|
|
|
|
#ifndef CGAL_IMPLICIT_CARTESIAN_GRID_DOMAIN_H
|
|
#define CGAL_IMPLICIT_CARTESIAN_GRID_DOMAIN_H
|
|
|
|
#include <CGAL/license/Isosurfacing_3.h>
|
|
|
|
#include <CGAL/Zero_gradient.h>
|
|
#include <CGAL/Isosurfacing_3/internal/Base_domain.h>
|
|
#include <CGAL/Isosurfacing_3/internal/Cartesian_grid_geometry.h>
|
|
#include <CGAL/Isosurfacing_3/internal/Grid_topology.h>
|
|
#include <CGAL/Isosurfacing_3/internal/Implicit_function_with_geometry.h>
|
|
|
|
namespace CGAL {
|
|
namespace Isosurfacing {
|
|
|
|
/**
|
|
* \ingroup PkgIsosurfacing3Ref
|
|
*
|
|
* \brief A domain that respesents a cartesian grid that discretizes an implicit function. It is a model of the concept
|
|
* `IsosurfacingDomainWithGradient`.
|
|
*
|
|
* \tparam GeomTraits the traits type
|
|
* \tparam PointFunction the type of the implicit function. It must implement `GeomTraits::FT operator()(const
|
|
* GeomTraits::Point& point) const`. \tparam Gradient_ the type of the gradient functor. It must implement
|
|
* `GeomTraits::Vector operator()(const GeomTraits::Point& point) const`.
|
|
*/
|
|
template <class GeomTraits, typename PointFunction, typename Gradient_>
|
|
using Implicit_cartesian_grid_domain =
|
|
Base_domain<GeomTraits, Grid_topology, Cartesian_grid_geometry<GeomTraits>,
|
|
Implicit_function_with_geometry<GeomTraits, Cartesian_grid_geometry<GeomTraits>, PointFunction>,
|
|
Gradient_>;
|
|
|
|
/**
|
|
* \ingroup PkgIsosurfacing3Ref
|
|
*
|
|
* \brief Creates a domain from an implicit function that can be used as input for isosurfacing algorithms.
|
|
*
|
|
* \details The implicit function will be evaluated on the grid points of the virtual grid
|
|
* defined by the bounding box and spacing. By not storing any function values implicitly
|
|
* less memory accesses are required in comparison to an `Explicit_cartesian_grid_domain`.
|
|
*
|
|
* \tparam GeomTraits the traits type
|
|
* \tparam PointFunction the type of the implicit function. It must implement `GeomTraits::FT operator()(const
|
|
* GeomTraits::Point& point) const`.
|
|
*
|
|
* \param bbox a bounding box that specifies the size of the functions domain
|
|
* \param spacing the distance between discretized points on the function
|
|
* \param point_function the function with a point as argument
|
|
* \param gradient a function that describes the gradient of the data
|
|
*
|
|
* \return a new `Implicit_cartesian_grid_domain`
|
|
*/
|
|
template <class GeomTraits, typename PointFunction, typename Gradient_ = Zero_gradient<GeomTraits>>
|
|
Implicit_cartesian_grid_domain<GeomTraits, PointFunction, Gradient_> create_implicit_cartesian_grid_domain(
|
|
const Bbox_3& bbox, const typename GeomTraits::Vector_3& spacing, const PointFunction& point_function,
|
|
const Gradient_& gradient = Gradient_()) {
|
|
|
|
typedef Implicit_cartesian_grid_domain<GeomTraits, PointFunction, Gradient_> Domain;
|
|
typedef typename Domain::Topology Topology;
|
|
typedef typename Domain::Geometry Geometry;
|
|
typedef typename Domain::Function Function;
|
|
typedef typename Domain::Gradient Gradient;
|
|
typedef typename Function::element_type::Point_function Point_function;
|
|
|
|
// calculate grid dimensions
|
|
const std::size_t size_i = std::ceil(bbox.x_span() / spacing.x()) + 1;
|
|
const std::size_t size_j = std::ceil(bbox.y_span() / spacing.y()) + 1;
|
|
const std::size_t size_k = std::ceil(bbox.z_span() / spacing.z()) + 1;
|
|
|
|
const typename GeomTraits::Vector_3 offset(bbox.xmin(), bbox.ymin(), bbox.zmin());
|
|
|
|
// create copies as shared_ptr for safe memory management
|
|
const Topology topo = std::make_shared<Topology::element_type>(size_i, size_j, size_k);
|
|
const Geometry geom = std::make_shared<Geometry::element_type>(offset, spacing);
|
|
const Point_function point_func = std::make_shared<Point_function::element_type>(point_function);
|
|
const Function func = std::make_shared<Function::element_type>(geom, point_func);
|
|
const Gradient grad = std::make_shared<Gradient::element_type>(gradient);
|
|
|
|
return Domain(topo, geom, func, grad);
|
|
}
|
|
|
|
} // namespace Isosurfacing
|
|
} // namespace CGAL
|
|
|
|
#endif // CGAL_IMPLICIT_CARTESIAN_GRID_DOMAIN_H
|