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41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
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/*
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* Copyright 2019 Google Inc. All Rights Reserved.
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*
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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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#include "vectorutils.h"
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namespace cardboard {
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// Returns the dot (inner) product of two Vectors.
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double Dot(const Vector<3>& v0, const Vector<3>& v1)
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{
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return v0[0] * v1[0] + v0[1] * v1[1] + v0[2] * v1[2];
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}
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// Returns the dot (inner) product of two Vectors.
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double Dot(const Vector<4>& v0, const Vector<4>& v1)
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{
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return v0[0] * v1[0] + v0[1] * v1[1] + v0[2] * v1[2] + v0[3] * v1[3];
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}
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// Returns the 3-dimensional cross product of 2 Vectors. Note that this is
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// defined only for 3-dimensional Vectors.
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Vector<3> Cross(const Vector<3>& v0, const Vector<3>& v1)
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{
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return Vector<3>(v0[1] * v1[2] - v0[2] * v1[1], v0[2] * v1[0] - v0[0] * v1[2],
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v0[0] * v1[1] - v0[1] * v1[0]);
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}
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} // namespace cardboard
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