306 lines
9.8 KiB
C++
306 lines
9.8 KiB
C++
/* ----------------------------------------------------------------------------
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* GTSAM Copyright 2010, Georgia Tech Research Corporation,
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* Atlanta, Georgia 30332-0415
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* All Rights Reserved
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* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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* See LICENSE for the license information
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* -------------------------------------------------------------------------- */
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/**
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* @file Rot3M.cpp
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* @brief Rotation (internal: 3*3 matrix representation*)
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* @author Alireza Fathi
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* @author Christian Potthast
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* @author Frank Dellaert
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* @author Richard Roberts
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*/
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#include <gtsam/config.h> // Get GTSAM_USE_QUATERNIONS macro
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#ifndef GTSAM_USE_QUATERNIONS
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#include <gtsam/geometry/Rot3.h>
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#include <boost/math/constants/constants.hpp>
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#include <cmath>
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using namespace std;
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namespace gtsam {
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/* ************************************************************************* */
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Rot3::Rot3() : rot_(I_3x3) {}
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/* ************************************************************************* */
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Rot3::Rot3(const Point3& col1, const Point3& col2, const Point3& col3) {
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rot_.col(0) = col1.vector();
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rot_.col(1) = col2.vector();
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rot_.col(2) = col3.vector();
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}
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/* ************************************************************************* */
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Rot3::Rot3(double R11, double R12, double R13,
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double R21, double R22, double R23,
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double R31, double R32, double R33) {
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rot_ << R11, R12, R13,
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R21, R22, R23,
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R31, R32, R33;
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}
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/* ************************************************************************* */
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Rot3::Rot3(const Matrix3& R) {
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rot_ = R;
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}
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/* ************************************************************************* */
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Rot3::Rot3(const Matrix& R) {
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if (R.rows()!=3 || R.cols()!=3)
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throw invalid_argument("Rot3 constructor expects 3*3 matrix");
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rot_ = R;
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}
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/* ************************************************************************* */
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Rot3::Rot3(const Quaternion& q) : rot_(q.toRotationMatrix()) {
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}
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/* ************************************************************************* */
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Rot3 Rot3::Rx(double t) {
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double st = sin(t), ct = cos(t);
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return Rot3(
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1, 0, 0,
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0, ct,-st,
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0, st, ct);
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}
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/* ************************************************************************* */
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Rot3 Rot3::Ry(double t) {
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double st = sin(t), ct = cos(t);
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return Rot3(
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ct, 0, st,
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0, 1, 0,
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-st, 0, ct);
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}
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/* ************************************************************************* */
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Rot3 Rot3::Rz(double t) {
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double st = sin(t), ct = cos(t);
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return Rot3(
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ct,-st, 0,
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st, ct, 0,
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0, 0, 1);
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}
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/* ************************************************************************* */
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// Considerably faster than composing matrices above !
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Rot3 Rot3::RzRyRx(double x, double y, double z) {
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double cx=cos(x),sx=sin(x);
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double cy=cos(y),sy=sin(y);
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double cz=cos(z),sz=sin(z);
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double ss_ = sx * sy;
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double cs_ = cx * sy;
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double sc_ = sx * cy;
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double cc_ = cx * cy;
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double c_s = cx * sz;
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double s_s = sx * sz;
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double _cs = cy * sz;
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double _cc = cy * cz;
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double s_c = sx * cz;
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double c_c = cx * cz;
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double ssc = ss_ * cz, csc = cs_ * cz, sss = ss_ * sz, css = cs_ * sz;
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return Rot3(
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_cc,- c_s + ssc, s_s + csc,
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_cs, c_c + sss, -s_c + css,
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-sy, sc_, cc_
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);
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}
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/* ************************************************************************* */
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Rot3 Rot3::rodriguez(const Vector3& w, double theta) {
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// get components of axis \omega
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double wx = w(0), wy=w(1), wz=w(2);
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double wwTxx = wx*wx, wwTyy = wy*wy, wwTzz = wz*wz;
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#ifndef NDEBUG
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double l_n = wwTxx + wwTyy + wwTzz;
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if (std::abs(l_n-1.0)>1e-9) throw domain_error("rodriguez: length of n should be 1");
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#endif
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double c = cos(theta), s = sin(theta), c_1 = 1 - c;
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double swx = wx * s, swy = wy * s, swz = wz * s;
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double C00 = c_1*wwTxx, C01 = c_1*wx*wy, C02 = c_1*wx*wz;
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double C11 = c_1*wwTyy, C12 = c_1*wy*wz;
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double C22 = c_1*wwTzz;
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return Rot3(
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c + C00, -swz + C01, swy + C02,
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swz + C01, c + C11, -swx + C12,
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-swy + C02, swx + C12, c + C22);
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}
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/* ************************************************************************* */
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Rot3 Rot3::compose(const Rot3& R2, OptionalJacobian<3, 3> H1, OptionalJacobian<3, 3> H2) const {
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if (H1) *H1 = R2.transpose();
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if (H2) *H2 = I_3x3;
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return *this * R2;
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}
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/* ************************************************************************* */
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Rot3 Rot3::operator*(const Rot3& R2) const {
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return Rot3(Matrix3(rot_*R2.rot_));
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}
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/* ************************************************************************* */
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// TODO const Eigen::Transpose<const Matrix3> Rot3::transpose() const {
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Matrix3 Rot3::transpose() const {
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return rot_.transpose();
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}
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/* ************************************************************************* */
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Rot3 Rot3::inverse(OptionalJacobian<3,3> H1) const {
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if (H1) *H1 = -rot_;
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return Rot3(Matrix3(transpose()));
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}
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/* ************************************************************************* */
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Rot3 Rot3::between (const Rot3& R2,
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OptionalJacobian<3,3> H1, OptionalJacobian<3,3> H2) const {
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if (H1) *H1 = -(R2.transpose()*rot_);
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if (H2) *H2 = I_3x3;
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Matrix3 R12 = transpose()*R2.rot_;
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return Rot3(R12);
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}
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/* ************************************************************************* */
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Point3 Rot3::rotate(const Point3& p,
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OptionalJacobian<3,3> H1, OptionalJacobian<3,3> H2) const {
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if (H1 || H2) {
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if (H1) *H1 = rot_ * skewSymmetric(-p.x(), -p.y(), -p.z());
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if (H2) *H2 = rot_;
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}
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return Point3(rot_ * p.vector());
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}
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/* ************************************************************************* */
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// Log map at identity - return the canonical coordinates of this rotation
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Vector3 Rot3::Logmap(const Rot3& R) {
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static const double PI = boost::math::constants::pi<double>();
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const Matrix3& rot = R.rot_;
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// Get trace(R)
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double tr = rot.trace();
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// when trace == -1, i.e., when theta = +-pi, +-3pi, +-5pi, etc.
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// we do something special
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if (std::abs(tr+1.0) < 1e-10) {
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if(std::abs(rot(2,2)+1.0) > 1e-10)
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return (PI / sqrt(2.0+2.0*rot(2,2) )) *
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Vector3(rot(0,2), rot(1,2), 1.0+rot(2,2));
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else if(std::abs(rot(1,1)+1.0) > 1e-10)
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return (PI / sqrt(2.0+2.0*rot(1,1))) *
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Vector3(rot(0,1), 1.0+rot(1,1), rot(2,1));
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else // if(std::abs(R.r1_.x()+1.0) > 1e-10) This is implicit
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return (PI / sqrt(2.0+2.0*rot(0,0))) *
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Vector3(1.0+rot(0,0), rot(1,0), rot(2,0));
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} else {
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double magnitude;
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double tr_3 = tr-3.0; // always negative
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if (tr_3<-1e-7) {
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double theta = acos((tr-1.0)/2.0);
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magnitude = theta/(2.0*sin(theta));
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} else {
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// when theta near 0, +-2pi, +-4pi, etc. (trace near 3.0)
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// use Taylor expansion: magnitude \approx 1/2-(t-3)/12 + O((t-3)^2)
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magnitude = 0.5 - tr_3*tr_3/12.0;
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}
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return magnitude*Vector3(
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rot(2,1)-rot(1,2),
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rot(0,2)-rot(2,0),
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rot(1,0)-rot(0,1));
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}
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}
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/* ************************************************************************* */
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Rot3 Rot3::retractCayley(const Vector& omega) const {
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const double x = omega(0), y = omega(1), z = omega(2);
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const double x2 = x * x, y2 = y * y, z2 = z * z;
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const double xy = x * y, xz = x * z, yz = y * z;
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const double f = 1.0 / (4.0 + x2 + y2 + z2), _2f = 2.0 * f;
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return (*this)
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* Rot3((4 + x2 - y2 - z2) * f, (xy - 2 * z) * _2f, (xz + 2 * y) * _2f,
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(xy + 2 * z) * _2f, (4 - x2 + y2 - z2) * f, (yz - 2 * x) * _2f,
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(xz - 2 * y) * _2f, (yz + 2 * x) * _2f, (4 - x2 - y2 + z2) * f);
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}
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/* ************************************************************************* */
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Rot3 Rot3::retract(const Vector& omega, Rot3::CoordinatesMode mode) const {
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if(mode == Rot3::EXPMAP) {
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return (*this)*Expmap(omega);
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} else if(mode == Rot3::CAYLEY) {
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return retractCayley(omega);
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} else if(mode == Rot3::SLOW_CAYLEY) {
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Matrix3 Omega = skewSymmetric(omega);
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return (*this)*CayleyFixed<3>(-Omega/2);
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} else {
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assert(false);
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exit(1);
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}
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}
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/* ************************************************************************* */
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Vector3 Rot3::localCoordinates(const Rot3& T, Rot3::CoordinatesMode mode) const {
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if(mode == Rot3::EXPMAP) {
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return Logmap(between(T));
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} else if(mode == Rot3::CAYLEY) {
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// Create a fixed-size matrix
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Matrix3 A = rot_.transpose() * T.matrix();
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// Mathematica closed form optimization (procrastination?) gone wild:
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const double a=A(0,0),b=A(0,1),c=A(0,2);
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const double d=A(1,0),e=A(1,1),f=A(1,2);
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const double g=A(2,0),h=A(2,1),i=A(2,2);
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const double di = d*i, ce = c*e, cd = c*d, fg=f*g;
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const double M = 1 + e - f*h + i + e*i;
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const double K = - 4.0 / (cd*h + M + a*M -g*(c + ce) - b*(d + di - fg));
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const double x = a * f - cd + f;
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const double y = b * f - ce - c;
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const double z = fg - di - d;
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return K * Vector3(x, y, z);
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} else if(mode == Rot3::SLOW_CAYLEY) {
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// Create a fixed-size matrix
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Matrix3 A(between(T).matrix());
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// using templated version of Cayley
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Matrix3 Omega = CayleyFixed<3>(A);
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return -2*Vector3(Omega(2,1),Omega(0,2),Omega(1,0));
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} else {
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assert(false);
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exit(1);
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}
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}
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/* ************************************************************************* */
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Matrix3 Rot3::matrix() const {
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return rot_;
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}
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/* ************************************************************************* */
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Point3 Rot3::r1() const { return Point3(rot_.col(0)); }
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/* ************************************************************************* */
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Point3 Rot3::r2() const { return Point3(rot_.col(1)); }
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/* ************************************************************************* */
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Point3 Rot3::r3() const { return Point3(rot_.col(2)); }
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/* ************************************************************************* */
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Quaternion Rot3::toQuaternion() const {
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return Quaternion(rot_);
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}
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/* ************************************************************************* */
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} // namespace gtsam
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#endif
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