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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
//
// 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 http://mozilla.org/MPL/2.0/.
#ifndef IGL_ANGULAR_DISTANCE_H
#define IGL_ANGULAR_DISTANCE_H
#include "igl_inline.h"
#include <Eigen/Geometry>
namespace igl
{
// The "angular distance" between two unit quaternions is the angle of the
// smallest rotation (treated as an Axis and Angle) that takes A to B.
//
// Inputs:
// A unit quaternion
// B unit quaternion
// Returns angular distance
IGL_INLINE double angular_distance(
const Eigen::Quaterniond & A,
const Eigen::Quaterniond & B);
}
#ifndef IGL_STATIC_LIBRARY
#include "angular_distance.cpp"
#endif
#endif
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