/* ----------------------------------------------------------------------------

 * GTSAM Copyright 2010, Georgia Tech Research Corporation,
 * Atlanta, Georgia 30332-0415
 * All Rights Reserved
 * Authors: Frank Dellaert, et al. (see THANKS for the full author list)

 * See LICENSE for the license information

 * -------------------------------------------------------------------------- */

/**
 * @file    testRot3.cpp
 * @brief   Unit tests for Rot3 class - common between Matrix and Quaternion
 * @author  Alireza Fathi
 * @author  Frank Dellaert
 * @author  Varun Agrawal
 */

#include <gtsam/geometry/Point3.h>
#include <gtsam/geometry/Rot3.h>
#include <gtsam/base/testLie.h>
#include <gtsam/base/Testable.h>
#include <gtsam/base/numericalDerivative.h>
#include <gtsam/base/lieProxies.h>

#include <boost/math/constants/constants.hpp>

#include <CppUnitLite/TestHarness.h>

using namespace std;
using namespace gtsam;

GTSAM_CONCEPT_TESTABLE_INST(Rot3)
GTSAM_CONCEPT_LIE_INST(Rot3)

static Rot3 R = Rot3::Rodrigues(0.1, 0.4, 0.2);
static Point3 P(0.2, 0.7, -2.0);
static double error = 1e-9, epsilon = 0.001;

//******************************************************************************
TEST(Rot3 , Concept) {
  BOOST_CONCEPT_ASSERT((IsGroup<Rot3 >));
  BOOST_CONCEPT_ASSERT((IsManifold<Rot3 >));
  BOOST_CONCEPT_ASSERT((IsLieGroup<Rot3 >));
}

/* ************************************************************************* */
TEST( Rot3, chart)
{
  Matrix R = (Matrix(3, 3) << 0, 1, 0, 1, 0, 0, 0, 0, -1).finished();
  Rot3 rot3(R);
}

/* ************************************************************************* */
TEST( Rot3, constructor)
{
  Rot3 expected((Matrix)I_3x3);
  Point3 r1(1,0,0), r2(0,1,0), r3(0,0,1);
  Rot3 actual(r1, r2, r3);
  CHECK(assert_equal(actual,expected));
}

/* ************************************************************************* */
TEST( Rot3, constructor2)
{
  Matrix R = (Matrix(3, 3) << 0, 1, 0, 1, 0, 0, 0, 0, -1).finished();
  Rot3 actual(R);
  Rot3 expected(0, 1, 0, 1, 0, 0, 0, 0, -1);
  CHECK(assert_equal(actual,expected));
}

/* ************************************************************************* */
TEST( Rot3, constructor3)
{
  Rot3 expected(0, 1, 0, 1, 0, 0, 0, 0, -1);
  Point3 r1(0,1,0), r2(1,0,0), r3(0,0,-1);
  CHECK(assert_equal(expected,Rot3(r1,r2,r3)));
}

/* ************************************************************************* */
TEST( Rot3, transpose)
{
  Point3 r1(0,1,0), r2(1,0,0), r3(0,0,-1);
  Rot3 R(0, 1, 0, 1, 0, 0, 0, 0, -1);
  CHECK(assert_equal(R.inverse(),Rot3(r1,r2,r3)));
}

/* ************************************************************************* */
TEST( Rot3, equals)
{
  CHECK(R.equals(R));
  Rot3 zero;
  CHECK(!R.equals(zero));
}

/* ************************************************************************* */
// Notice this uses J^2 whereas fast uses w*w', and has cos(t)*I + ....
Rot3 slow_but_correct_Rodrigues(const Vector& w) {
  double t = w.norm();
  Matrix3 J = skewSymmetric(w / t);
  if (t < 1e-5) return Rot3();
  Matrix3 R = I_3x3 + sin(t) * J + (1.0 - cos(t)) * (J * J);
  return Rot3(R);
}

/* ************************************************************************* */
TEST( Rot3, AxisAngle)
{
  Vector axis = Vector3(0., 1., 0.); // rotation around Y
  double angle = 3.14 / 4.0;
  Rot3 expected(0.707388, 0, 0.706825,
                       0, 1,        0,
               -0.706825, 0, 0.707388);
  Rot3 actual = Rot3::AxisAngle(axis, angle);
  CHECK(assert_equal(expected,actual,1e-5));
  Rot3 actual2 = Rot3::AxisAngle(axis, angle-2*M_PI);
  CHECK(assert_equal(expected,actual2,1e-5));

  axis = Vector3(0, 50, 0);
  Rot3 actual3 = Rot3::AxisAngle(axis, angle);
  CHECK(assert_equal(expected,actual3,1e-5));
}

/* ************************************************************************* */
TEST( Rot3, Rodrigues)
{
  Rot3 R1 = Rot3::Rodrigues(epsilon, 0, 0);
  Vector w = (Vector(3) << epsilon, 0., 0.).finished();
  Rot3 R2 = slow_but_correct_Rodrigues(w);
  CHECK(assert_equal(R2,R1));
}

/* ************************************************************************* */
TEST( Rot3, Rodrigues2)
{
  Vector axis = Vector3(0., 1., 0.); // rotation around Y
  double angle = 3.14 / 4.0;
  Rot3 expected(0.707388, 0, 0.706825,
                       0, 1,        0,
               -0.706825, 0, 0.707388);
  Rot3 actual = Rot3::AxisAngle(axis, angle);
  CHECK(assert_equal(expected,actual,1e-5));
  Rot3 actual2 = Rot3::Rodrigues(angle*axis);
  CHECK(assert_equal(expected,actual2,1e-5));
}

/* ************************************************************************* */
TEST( Rot3, Rodrigues3)
{
  Vector w = Vector3(0.1, 0.2, 0.3);
  Rot3 R1 = Rot3::AxisAngle(w / w.norm(), w.norm());
  Rot3 R2 = slow_but_correct_Rodrigues(w);
  CHECK(assert_equal(R2,R1));
}

/* ************************************************************************* */
TEST( Rot3, Rodrigues4)
{
  Vector axis = Vector3(0., 0., 1.); // rotation around Z
  double angle = M_PI/2.0;
  Rot3 actual = Rot3::AxisAngle(axis, angle);
  double c=cos(angle),s=sin(angle);
  Rot3 expected(c,-s, 0,
                s, c, 0,
                0, 0, 1);
  CHECK(assert_equal(expected,actual));
  CHECK(assert_equal(slow_but_correct_Rodrigues(axis*angle),actual));
}

/* ************************************************************************* */
TEST( Rot3, retract)
{
  Vector v = Z_3x1;
  CHECK(assert_equal(R, R.retract(v)));

//  // test Canonical coordinates
//  Canonical<Rot3> chart;
//  Vector v2 = chart.local(R);
//  CHECK(assert_equal(R, chart.retract(v2)));
}

/* ************************************************************************* */
TEST(Rot3, log) {
  static const double PI = boost::math::constants::pi<double>();
  Vector w;
  Rot3 R;

#define CHECK_OMEGA(X, Y, Z)             \
  w = (Vector(3) << X, Y, Z).finished(); \
  R = Rot3::Rodrigues(w);                \
  EXPECT(assert_equal(w, Rot3::Logmap(R), 1e-12));

  // Check zero
  CHECK_OMEGA(0, 0, 0)

  // create a random direction:
  double norm = sqrt(1.0 + 16.0 + 4.0);
  double x = 1.0 / norm, y = 4.0 / norm, z = 2.0 / norm;

  // Check very small rotation for Taylor expansion
  // Note that tolerance above is 1e-12, so Taylor is pretty good !
  double d = 0.0001;
  CHECK_OMEGA(d, 0, 0)
  CHECK_OMEGA(0, d, 0)
  CHECK_OMEGA(0, 0, d)
  CHECK_OMEGA(x * d, y * d, z * d)

  // check normal rotation
  d = 0.1;
  CHECK_OMEGA(d, 0, 0)
  CHECK_OMEGA(0, d, 0)
  CHECK_OMEGA(0, 0, d)
  CHECK_OMEGA(x * d, y * d, z * d)

  // Check 180 degree rotations
  CHECK_OMEGA(PI, 0, 0)
  CHECK_OMEGA(0, PI, 0)
  CHECK_OMEGA(0, 0, PI)

  // Windows and Linux have flipped sign in quaternion mode
#if !defined(__APPLE__) && defined(GTSAM_USE_QUATERNIONS)
  w = (Vector(3) << x * PI, y * PI, z * PI).finished();
  R = Rot3::Rodrigues(w);
  EXPECT(assert_equal(Vector(-w), Rot3::Logmap(R), 1e-12));
#else
  CHECK_OMEGA(x * PI, y * PI, z * PI)
#endif

  // Check 360 degree rotations
#define CHECK_OMEGA_ZERO(X, Y, Z)        \
  w = (Vector(3) << X, Y, Z).finished(); \
  R = Rot3::Rodrigues(w);                \
  EXPECT(assert_equal((Vector)Z_3x1, Rot3::Logmap(R)));

  CHECK_OMEGA_ZERO(2.0 * PI, 0, 0)
  CHECK_OMEGA_ZERO(0, 2.0 * PI, 0)
  CHECK_OMEGA_ZERO(0, 0, 2.0 * PI)
  CHECK_OMEGA_ZERO(x * 2. * PI, y * 2. * PI, z * 2. * PI)

  // Check problematic case from Lund dataset vercingetorix.g2o
  // This is an almost rotation with determinant not *quite* 1.
  Rot3 Rlund(-0.98582676, -0.03958746, -0.16303092,  //
             -0.03997006, -0.88835923, 0.45740671,   //
             -0.16293753, 0.45743998, 0.87418537);

  // Rot3's Logmap returns different, but equivalent compacted
  // axis-angle vectors depending on whether Rot3 is implemented
  // by Quaternions or SO3.
  #if defined(GTSAM_USE_QUATERNIONS)
    // Quaternion bounds angle to [-pi, pi] resulting in ~179.9 degrees
    EXPECT(assert_equal(Vector3(0.264451979, -0.742197651, -3.04098211),
                        (Vector)Rot3::Logmap(Rlund), 1e-8));
  #else
    // SO3 does not bound angle resulting in ~180.1 degrees
    EXPECT(assert_equal(Vector3(-0.264544406, 0.742217405, 3.04117314),
                        (Vector)Rot3::Logmap(Rlund), 1e-8));
  #endif
}

/* ************************************************************************* */
TEST(Rot3, retract_localCoordinates)
{
  Vector3 d12 = Vector3::Constant(0.1);
  Rot3 R2 = R.retract(d12);
  EXPECT(assert_equal(d12, R.localCoordinates(R2)));
}
/* ************************************************************************* */
TEST(Rot3, expmap_logmap)
{
  Vector d12 = Vector3::Constant(0.1);
  Rot3 R2 = R.expmap(d12);
  EXPECT(assert_equal(d12, R.logmap(R2)));
}

/* ************************************************************************* */
TEST(Rot3, retract_localCoordinates2)
{
  Rot3 t1 = R, t2 = R*R, origin;
  Vector d12 = t1.localCoordinates(t2);
  EXPECT(assert_equal(t2, t1.retract(d12)));
  Vector d21 = t2.localCoordinates(t1);
  EXPECT(assert_equal(t1, t2.retract(d21)));
  EXPECT(assert_equal(d12, -d21));
}
/* ************************************************************************* */
TEST(Rot3, manifold_expmap)
{
  Rot3 gR1 = Rot3::Rodrigues(0.1, 0.4, 0.2);
  Rot3 gR2 = Rot3::Rodrigues(0.3, 0.1, 0.7);
  Rot3 origin;

  // log behaves correctly
  Vector d12 = Rot3::Logmap(gR1.between(gR2));
  Vector d21 = Rot3::Logmap(gR2.between(gR1));

  // Check expmap
  CHECK(assert_equal(gR2, gR1*Rot3::Expmap(d12)));
  CHECK(assert_equal(gR1, gR2*Rot3::Expmap(d21)));

  // Check that log(t1,t2)=-log(t2,t1)
  CHECK(assert_equal(d12,-d21));

  // lines in canonical coordinates correspond to Abelian subgroups in SO(3)
  Vector d = Vector3(0.1, 0.2, 0.3);
  // exp(-d)=inverse(exp(d))
  CHECK(assert_equal(Rot3::Expmap(-d),Rot3::Expmap(d).inverse()));
  // exp(5d)=exp(2*d+3*d)=exp(2*d)exp(3*d)=exp(3*d)exp(2*d)
  Rot3 R2 = Rot3::Expmap (2 * d);
  Rot3 R3 = Rot3::Expmap (3 * d);
  Rot3 R5 = Rot3::Expmap (5 * d);
  CHECK(assert_equal(R5,R2*R3));
  CHECK(assert_equal(R5,R3*R2));
}

/* ************************************************************************* */
class AngularVelocity : public Vector3 {
 public:
  template <typename Derived>
  inline AngularVelocity(const Eigen::MatrixBase<Derived>& v)
      : Vector3(v) {}

  AngularVelocity(double wx, double wy, double wz) : Vector3(wx, wy, wz) {}
};

AngularVelocity bracket(const AngularVelocity& X, const AngularVelocity& Y) {
  return X.cross(Y);
}

/* ************************************************************************* */
TEST(Rot3, BCH)
{
  // Approximate exmap by BCH formula
  AngularVelocity w1(0.2, -0.1, 0.1);
  AngularVelocity w2(0.01, 0.02, -0.03);
  Rot3 R1 = Rot3::Expmap (w1), R2 = Rot3::Expmap (w2);
  Rot3 R3 = R1 * R2;
  Vector expected = Rot3::Logmap(R3);
  Vector actual = BCH(w1, w2);
  CHECK(assert_equal(expected, actual,1e-5));
}

/* ************************************************************************* */
TEST( Rot3, rotate_derivatives)
{
  Matrix actualDrotate1a, actualDrotate1b, actualDrotate2;
  R.rotate(P, actualDrotate1a, actualDrotate2);
  R.inverse().rotate(P, actualDrotate1b, boost::none);
  Matrix numerical1 = numericalDerivative21(testing::rotate<Rot3,Point3>, R, P);
  Matrix numerical2 = numericalDerivative21(testing::rotate<Rot3,Point3>, R.inverse(), P);
  Matrix numerical3 = numericalDerivative22(testing::rotate<Rot3,Point3>, R, P);
  EXPECT(assert_equal(numerical1,actualDrotate1a,error));
  EXPECT(assert_equal(numerical2,actualDrotate1b,error));
  EXPECT(assert_equal(numerical3,actualDrotate2, error));
}

/* ************************************************************************* */
TEST( Rot3, unrotate)
{
  Point3 w = R * P;
  Matrix H1,H2;
  Point3 actual = R.unrotate(w,H1,H2);
  CHECK(assert_equal(P,actual));

  Matrix numerical1 = numericalDerivative21(testing::unrotate<Rot3,Point3>, R, w);
  CHECK(assert_equal(numerical1,H1,error));

  Matrix numerical2 = numericalDerivative22(testing::unrotate<Rot3,Point3>, R, w);
  CHECK(assert_equal(numerical2,H2,error));
}

/* ************************************************************************* */
TEST( Rot3, compose )
{
  Rot3 R1 = Rot3::Rodrigues(0.1, 0.2, 0.3);
  Rot3 R2 = Rot3::Rodrigues(0.2, 0.3, 0.5);

  Rot3 expected = R1 * R2;
  Matrix actualH1, actualH2;
  Rot3 actual = R1.compose(R2, actualH1, actualH2);
  CHECK(assert_equal(expected,actual));

  Matrix numericalH1 = numericalDerivative21(testing::compose<Rot3>, R1,
      R2, 1e-2);
  CHECK(assert_equal(numericalH1,actualH1));

  Matrix numericalH2 = numericalDerivative22(testing::compose<Rot3>, R1,
      R2, 1e-2);
  CHECK(assert_equal(numericalH2,actualH2));
}

/* ************************************************************************* */
TEST( Rot3, inverse )
{
  Rot3 R = Rot3::Rodrigues(0.1, 0.2, 0.3);

  Rot3 I;
  Matrix3 actualH;
  Rot3 actual = R.inverse(actualH);
  CHECK(assert_equal(I,R*actual));
  CHECK(assert_equal(I,actual*R));
  CHECK(assert_equal(actual.matrix(), R.transpose()));

  Matrix numericalH = numericalDerivative11(testing::inverse<Rot3>, R);
  CHECK(assert_equal(numericalH,actualH));
}

/* ************************************************************************* */
TEST( Rot3, between )
{
  Rot3 r1 = Rot3::Rz(M_PI/3.0);
  Rot3 r2 = Rot3::Rz(2.0*M_PI/3.0);

  Matrix expectedr1 = (Matrix(3, 3) <<
      0.5, -sqrt(3.0)/2.0, 0.0,
      sqrt(3.0)/2.0, 0.5, 0.0,
      0.0, 0.0, 1.0).finished();
  EXPECT(assert_equal(expectedr1, r1.matrix()));

  Rot3 R = Rot3::Rodrigues(0.1, 0.4, 0.2);
  Rot3 origin;
  EXPECT(assert_equal(R, origin.between(R)));
  EXPECT(assert_equal(R.inverse(), R.between(origin)));

  Rot3 R1 = Rot3::Rodrigues(0.1, 0.2, 0.3);
  Rot3 R2 = Rot3::Rodrigues(0.2, 0.3, 0.5);

  Rot3 expected = R1.inverse() * R2;
  Matrix actualH1, actualH2;
  Rot3 actual = R1.between(R2, actualH1, actualH2);
  EXPECT(assert_equal(expected,actual));

  Matrix numericalH1 = numericalDerivative21(testing::between<Rot3> , R1, R2);
  CHECK(assert_equal(numericalH1,actualH1));

  Matrix numericalH2 = numericalDerivative22(testing::between<Rot3> , R1, R2);
  CHECK(assert_equal(numericalH2,actualH2));
}

/* ************************************************************************* */
TEST( Rot3, xyz )
{
  double t = 0.1, st = sin(t), ct = cos(t);

  // Make sure all counterclockwise
  // Diagrams below are all from from unchanging axis

  // z
  // |   * Y=(ct,st)
  // x----y
  Rot3 expected1(1, 0, 0, 0, ct, -st, 0, st, ct);
  CHECK(assert_equal(expected1,Rot3::Rx(t)));

  // x
  // |   * Z=(ct,st)
  // y----z
  Rot3 expected2(ct, 0, st, 0, 1, 0, -st, 0, ct);
  CHECK(assert_equal(expected2,Rot3::Ry(t)));

  // y
  // |   X=* (ct,st)
  // z----x
  Rot3 expected3(ct, -st, 0, st, ct, 0, 0, 0, 1);
  CHECK(assert_equal(expected3,Rot3::Rz(t)));

  // Check compound rotation
  Rot3 expected = Rot3::Rz(0.3) * Rot3::Ry(0.2) * Rot3::Rx(0.1);
  CHECK(assert_equal(expected,Rot3::RzRyRx(0.1,0.2,0.3)));
}

/* ************************************************************************* */
TEST( Rot3, yaw_pitch_roll )
{
  double t = 0.1;

  // yaw is around z axis
  CHECK(assert_equal(Rot3::Rz(t),Rot3::Yaw(t)));

  // pitch is around y axis
  CHECK(assert_equal(Rot3::Ry(t),Rot3::Pitch(t)));

  // roll is around x axis
  CHECK(assert_equal(Rot3::Rx(t),Rot3::Roll(t)));

  // Check compound rotation
  Rot3 expected = Rot3::Yaw(0.1) * Rot3::Pitch(0.2) * Rot3::Roll(0.3);
  CHECK(assert_equal(expected,Rot3::Ypr(0.1,0.2,0.3)));

  CHECK(assert_equal((Vector)Vector3(0.1, 0.2, 0.3),expected.ypr()));
}

/* ************************************************************************* */
TEST( Rot3, RQ)
{
  // Try RQ on a pure rotation
  Matrix actualK;
  Vector actual;
  boost::tie(actualK, actual) = RQ(R.matrix());
  Vector expected = Vector3(0.14715, 0.385821, 0.231671);
  CHECK(assert_equal(I_3x3,actualK));
  CHECK(assert_equal(expected,actual,1e-6));

  // Try using xyz call, asserting that Rot3::RzRyRx(x,y,z).xyz()==[x;y;z]
  CHECK(assert_equal(expected,R.xyz(),1e-6));
  CHECK(assert_equal((Vector)Vector3(0.1,0.2,0.3),Rot3::RzRyRx(0.1,0.2,0.3).xyz()));

  // Try using ypr call, asserting that Rot3::Ypr(y,p,r).ypr()==[y;p;r]
  CHECK(assert_equal((Vector)Vector3(0.1,0.2,0.3),Rot3::Ypr(0.1,0.2,0.3).ypr()));
  CHECK(assert_equal((Vector)Vector3(0.3,0.2,0.1),Rot3::Ypr(0.1,0.2,0.3).rpy()));

  // Try ypr for pure yaw-pitch-roll matrices
  CHECK(assert_equal((Vector)Vector3(0.1,0.0,0.0),Rot3::Yaw (0.1).ypr()));
  CHECK(assert_equal((Vector)Vector3(0.0,0.1,0.0),Rot3::Pitch(0.1).ypr()));
  CHECK(assert_equal((Vector)Vector3(0.0,0.0,0.1),Rot3::Roll (0.1).ypr()));

  // Try RQ to recover calibration from 3*3 sub-block of projection matrix
  Matrix K = (Matrix(3, 3) << 500.0, 0.0, 320.0, 0.0, 500.0, 240.0, 0.0, 0.0, 1.0).finished();
  Matrix A = K * R.matrix();
  boost::tie(actualK, actual) = RQ(A);
  CHECK(assert_equal(K,actualK));
  CHECK(assert_equal(expected,actual,1e-6));
}

/* ************************************************************************* */
TEST( Rot3, expmapStability ) {
  Vector w = Vector3(78e-9, 5e-8, 97e-7);
  double theta = w.norm();
  double theta2 = theta*theta;
  Rot3 actualR = Rot3::Expmap(w);
  Matrix W = (Matrix(3, 3) << 0.0, -w(2), w(1),
                          w(2), 0.0, -w(0),
                          -w(1), w(0), 0.0 ).finished();
  Matrix W2 = W*W;
  Matrix Rmat = I_3x3 + (1.0-theta2/6.0 + theta2*theta2/120.0
      - theta2*theta2*theta2/5040.0)*W + (0.5 - theta2/24.0 + theta2*theta2/720.0)*W2 ;
  Rot3 expectedR( Rmat );
  CHECK(assert_equal(expectedR, actualR, 1e-10));
}

/* ************************************************************************* */
TEST( Rot3, logmapStability ) {
  Vector w = Vector3(1e-8, 0.0, 0.0);
  Rot3 R = Rot3::Expmap(w);
//  double tr = R.r1().x()+R.r2().y()+R.r3().z();
//  std::cout.precision(5000);
//  std::cout << "theta: " << w.norm() << std::endl;
//  std::cout << "trace: " << tr << std::endl;
//  R.print("R = ");
  Vector actualw = Rot3::Logmap(R);
  CHECK(assert_equal(w, actualw, 1e-15));
}

/* ************************************************************************* */
TEST(Rot3, quaternion) {
  // NOTE: This is also verifying the ability to convert Vector to Quaternion
  Quaternion q1(0.710997408193224, 0.360544029310185, 0.594459869568306, 0.105395217842782);
  Rot3 R1(0.271018623057411, 0.278786459830371, 0.921318086098018,
          0.578529366719085, 0.717799701969298, -0.387385285854279,
          -0.769319620053772, 0.637998195662053, 0.033250932803219);

  Quaternion q2(0.263360579192421, 0.571813128030932, 0.494678363680335,
                0.599136268678053);
  Rot3 R2(-0.207341903877828, 0.250149415542075, 0.945745528564780,
          0.881304914479026, -0.371869043667957, 0.291573424846290,
          0.424630407073532, 0.893945571198514, -0.143353873763946);

  // Check creating Rot3 from quaternion
  EXPECT(assert_equal(R1, Rot3(q1)));
  EXPECT(assert_equal(R1, Rot3::Quaternion(q1.w(), q1.x(), q1.y(), q1.z())));
  EXPECT(assert_equal(R2, Rot3(q2)));
  EXPECT(assert_equal(R2, Rot3::Quaternion(q2.w(), q2.x(), q2.y(), q2.z())));

  // Check converting Rot3 to quaterion
  EXPECT(assert_equal(Vector(R1.toQuaternion().coeffs()), Vector(q1.coeffs())));
  EXPECT(assert_equal(Vector(R2.toQuaternion().coeffs()), Vector(q2.coeffs())));

  // Check that quaternion and Rot3 represent the same rotation
  Point3 p1(1.0, 2.0, 3.0);
  Point3 p2(8.0, 7.0, 9.0);

  Point3 expected1 = R1*p1;
  Point3 expected2 = R2*p2;

  Point3 actual1 = Point3(q1*p1);
  Point3 actual2 = Point3(q2*p2);

  EXPECT(assert_equal(expected1, actual1));
  EXPECT(assert_equal(expected2, actual2));
}

/* ************************************************************************* */
Matrix Cayley(const Matrix& A) {
  Matrix::Index n = A.cols();
  const Matrix I = Matrix::Identity(n,n);
  return (I-A)*(I+A).inverse();
}

TEST( Rot3, Cayley ) {
  Matrix A = skewSymmetric(1,2,-3);
  Matrix Q = Cayley(A);
  EXPECT(assert_equal((Matrix)I_3x3, trans(Q)*Q));
  EXPECT(assert_equal(A, Cayley(Q)));
}

/* ************************************************************************* */
TEST( Rot3, stream)
{
  Rot3 R;
  std::ostringstream os;
  os << R;
  EXPECT(os.str() == "\n|1, 0, 0|\n|0, 1, 0|\n|0, 0, 1|\n");
}

/* ************************************************************************* */
TEST( Rot3, slerp)
{
  // A first simple test
  Rot3 R1 = Rot3::Rz(1), R2 = Rot3::Rz(2), R3 = Rot3::Rz(1.5);
  EXPECT(assert_equal(R1, R1.slerp(0.0,R2)));
  EXPECT(assert_equal(R2, R1.slerp(1.0,R2)));
  EXPECT(assert_equal(R3, R1.slerp(0.5,R2)));
  // Make sure other can be *this
  EXPECT(assert_equal(R1, R1.slerp(0.5,R1)));
}

//******************************************************************************
Rot3 T1(Rot3::AxisAngle(Vector3(0, 0, 1), 1));
Rot3 T2(Rot3::AxisAngle(Vector3(0, 1, 0), 2));

//******************************************************************************
TEST(Rot3 , Invariants) {
  Rot3 id;

  EXPECT(check_group_invariants(id,id));
  EXPECT(check_group_invariants(id,T1));
  EXPECT(check_group_invariants(T2,id));
  EXPECT(check_group_invariants(T2,T1));
  EXPECT(check_group_invariants(T1,T2));

  EXPECT(check_manifold_invariants(id,id));
  EXPECT(check_manifold_invariants(id,T1));
  EXPECT(check_manifold_invariants(T2,id));
  EXPECT(check_manifold_invariants(T2,T1));
  EXPECT(check_manifold_invariants(T1,T2));
}

//******************************************************************************
TEST(Rot3 , LieGroupDerivatives) {
  Rot3 id;

  CHECK_LIE_GROUP_DERIVATIVES(id,id);
  CHECK_LIE_GROUP_DERIVATIVES(id,T2);
  CHECK_LIE_GROUP_DERIVATIVES(T2,id);
  CHECK_LIE_GROUP_DERIVATIVES(T1,T2);
  CHECK_LIE_GROUP_DERIVATIVES(T2,T1);
}

//******************************************************************************
TEST(Rot3 , ChartDerivatives) {
  Rot3 id;
  if (ROT3_DEFAULT_COORDINATES_MODE == Rot3::EXPMAP) {
    CHECK_CHART_DERIVATIVES(id,id);
    CHECK_CHART_DERIVATIVES(id,T2);
    CHECK_CHART_DERIVATIVES(T2,id);
    CHECK_CHART_DERIVATIVES(T1,T2);
    CHECK_CHART_DERIVATIVES(T2,T1);
  }
}

/* ************************************************************************* */
TEST(Rot3, ClosestTo) {
  Matrix3 M;
  M << 0.79067393, 0.6051136, -0.0930814,   //
      0.4155925, -0.64214347, -0.64324489,  //
      -0.44948549, 0.47046326, -0.75917576;

  Matrix expected(3, 3);
  expected << 0.790687, 0.605096, -0.0931312,  //
      0.415746, -0.642355, -0.643844,          //
      -0.449411, 0.47036, -0.759468;

  auto actual = Rot3::ClosestTo(3*M);
  EXPECT(assert_equal(expected, actual.matrix(), 1e-6));
}

/* ************************************************************************* */
TEST(Rot3, axisAngle) {
  Unit3 actualAxis;
  double actualAngle;

// not a lambda as otherwise we can't trace error easily
#define CHECK_AXIS_ANGLE(expectedAxis, expectedAngle, rotation) \
  std::tie(actualAxis, actualAngle) = rotation.axisAngle();     \
  EXPECT(assert_equal(expectedAxis, actualAxis, 1e-9));         \
  EXPECT_DOUBLES_EQUAL(expectedAngle, actualAngle, 1e-9);       \
  EXPECT(assert_equal(rotation, Rot3::AxisAngle(expectedAxis, expectedAngle)))

  // CHECK R defined at top = Rot3::Rodrigues(0.1, 0.4, 0.2)
  Vector3 omega(0.1, 0.4, 0.2);
  Unit3 axis(omega), _axis(-omega);
  CHECK_AXIS_ANGLE(axis, omega.norm(), R);

  // rotate by 90
  CHECK_AXIS_ANGLE(Unit3(1, 0, 0), M_PI_2, Rot3::Ypr(0, 0, M_PI_2))
  CHECK_AXIS_ANGLE(Unit3(0, 1, 0), M_PI_2, Rot3::Ypr(0, M_PI_2, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, 1), M_PI_2, Rot3::Ypr(M_PI_2, 0, 0))
  CHECK_AXIS_ANGLE(axis, M_PI_2, Rot3::AxisAngle(axis, M_PI_2))

  // rotate by -90
  CHECK_AXIS_ANGLE(Unit3(-1, 0, 0), M_PI_2, Rot3::Ypr(0, 0, -M_PI_2))
  CHECK_AXIS_ANGLE(Unit3(0, -1, 0), M_PI_2, Rot3::Ypr(0, -M_PI_2, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, -1), M_PI_2, Rot3::Ypr(-M_PI_2, 0, 0))
  CHECK_AXIS_ANGLE(_axis, M_PI_2, Rot3::AxisAngle(axis, -M_PI_2))

  // rotate by 270
  const double theta270 = M_PI + M_PI / 2;
  CHECK_AXIS_ANGLE(Unit3(-1, 0, 0), M_PI_2, Rot3::Ypr(0, 0, theta270))
  CHECK_AXIS_ANGLE(Unit3(0, -1, 0), M_PI_2, Rot3::Ypr(0, theta270, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, -1), M_PI_2, Rot3::Ypr(theta270, 0, 0))
  CHECK_AXIS_ANGLE(_axis, M_PI_2, Rot3::AxisAngle(axis, theta270))

  // rotate by -270
  const double theta_270 = -(M_PI + M_PI / 2);  // 90 (or -270) degrees
  CHECK_AXIS_ANGLE(Unit3(1, 0, 0), M_PI_2, Rot3::Ypr(0, 0, theta_270))
  CHECK_AXIS_ANGLE(Unit3(0, 1, 0), M_PI_2, Rot3::Ypr(0, theta_270, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, 1), M_PI_2, Rot3::Ypr(theta_270, 0, 0))
  CHECK_AXIS_ANGLE(axis, M_PI_2, Rot3::AxisAngle(axis, theta_270))

  const double theta195 = 195 * M_PI / 180;
  const double theta165 = 165 * M_PI / 180;

  /// Non-trivial angle 165
  CHECK_AXIS_ANGLE(Unit3(1, 0, 0), theta165, Rot3::Ypr(0, 0, theta165))
  CHECK_AXIS_ANGLE(Unit3(0, 1, 0), theta165, Rot3::Ypr(0, theta165, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, 1), theta165, Rot3::Ypr(theta165, 0, 0))
  CHECK_AXIS_ANGLE(axis, theta165, Rot3::AxisAngle(axis, theta165))

  /// Non-trivial angle 195
  CHECK_AXIS_ANGLE(Unit3(-1, 0, 0), theta165, Rot3::Ypr(0, 0, theta195))
  CHECK_AXIS_ANGLE(Unit3(0, -1, 0), theta165, Rot3::Ypr(0, theta195, 0))
  CHECK_AXIS_ANGLE(Unit3(0, 0, -1), theta165, Rot3::Ypr(theta195, 0, 0))
  CHECK_AXIS_ANGLE(_axis, theta165, Rot3::AxisAngle(axis, theta195))
}

/* ************************************************************************* */
int main() {
  TestResult tr;
  return TestRegistry::runAllTests(tr);
}
/* ************************************************************************* */