Acts/Definitions/Tolerance.hpp

0001 // This file is part of the Acts project.
0002 //
0003 // Copyright (C) 2023 CERN for the benefit of the Acts project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
0008
0009 #pragma once
0010
0011 #include "Acts/Definitions/Algebra.hpp"
0012
0013 #include <limits>
0014
0015 namespace Acts {
0016
0017 /// Tolerance for being numerical equal for geometry building
0018 static constexpr ActsScalar s_epsilon =
0019     3 * std::numeric_limits<ActsScalar>::epsilon();
0020
0021 /// Tolerance for being on Surface
0022 ///
0023 /// @note This is intentionally given w/o an explicit unit to avoid having
0024 ///       to include the units header unnecessarily. With the native length
0025 ///       unit of mm this corresponds to 0.1um.
0026 static constexpr ActsScalar s_onSurfaceTolerance = 1e-4;
0027
0028 /// Tolerance for not being within curvilinear projection
0029 /// this allows using the same curvilinear frame to eta = 6,
0030 /// validity tested with IntegrationTests/PropagationTest
0031 static constexpr ActsScalar s_curvilinearProjTolerance = 0.999995;
0032
0033 }  // namespace Acts