73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#include "ray.hpp"
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#include "iostream.hpp"
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#include "ops.hpp"
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#include "../coord/iostream.hpp"
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#include "../debug.hpp"
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using util::geom::ray;
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///////////////////////////////////////////////////////////////////////////////
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/// returns the closest parameter along the ray to a given point
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template <size_t S, typename T>
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T
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ray<S,T>::closest (point<S,T> q) const
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{
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// project the origin-point difference onto the direction
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return dot (origin - q, direction);
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}
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//-----------------------------------------------------------------------------
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template <size_t S, typename T>
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util::point<S,T>
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ray<S,T>::at (T t) const
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{
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return origin + direction * t;
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}
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///////////////////////////////////////////////////////////////////////////////
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util::geom::ray3f
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util::geom::operator* (util::matrix4f lhs, ray3f rhs)
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{
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return {
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(lhs * rhs.origin.homog<4> ()).redim<3> (),
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(lhs * rhs.direction.homog<4> ()).redim<3> ()
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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template <size_t S, typename T>
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std::ostream&
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util::geom::operator<< (std::ostream &os, ray<S,T> r)
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{
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return os << "ray(" << r.origin << ',' << r.direction << ')';
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}
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template std::ostream& util::geom::operator<< (std::ostream&, ray<3,float>);
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template std::ostream& util::geom::operator<< (std::ostream&, ray<3,double>);
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///////////////////////////////////////////////////////////////////////////////
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template struct util::geom::ray<2,float>;
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template struct util::geom::ray<3,float>;
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