geometry_utils.hpp

// This file is part of the ACTS project.
//
// Copyright (C) 2016 CERN for the benefit of the ACTS project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
#pragma once
 
// Project include(s)
#include "detray/core/concepts.hpp"
#include "detray/definitions/algebra.hpp"
#include "detray/definitions/math.hpp"
#include "detray/geometry/surface.hpp"
 
namespace detray {

template <concepts::detector detector_t, concepts::point point_t>
DETRAY_HOST_DEVICE constexpr dscalar<typename detector_t::algebra_type>
cos_angle(const typename detector_t::geometry_context &ctx,
          geometry::surface<detector_t> sf,
          const dvector3D<typename detector_t::algebra_type> &dir,
          const point_t &loc) {
  return math::fabs(vector::dot(dir, sf.normal(ctx, loc)));
}
 
}  // namespace detray