## Finding roll, pitch yaw from 3X3 rotation matrix with Eigen

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/* http://planning.cs.uiuc.edu/node103.html |r11 r12 r13 | |r21 r22 r23 | |r31 r32 r33 | yaw: alpha=arctan(r21/r11) pitch: beta=arctan(-r31/sqrt( r32^2+r33^2 ) ) roll: gamma=arctan(r32/r33) */ double roll, pitch, yaw; roll=M_PI/3; pitch=M_PI/4; yaw=M_PI/6; Eigen::AngleAxisd rollAngle(roll, Eigen::Vector3d::UnitX()); Eigen::AngleAxisd pitchAngle(pitch, Eigen::Vector3d::UnitY()); Eigen::AngleAxisd yawAngle(yaw, Eigen::Vector3d::UnitZ()); Eigen::Quaternion<double> q = yawAngle*pitchAngle *rollAngle; Eigen::Matrix3d rotationMatrix = q.matrix(); std::cout<<"roll is Pi/" <<M_PI/atan2( rotationMatrix(2,1),rotationMatrix(2,2) ) <<std::endl; std::cout<<"pitch: Pi/" <<M_PI/atan2( -rotationMatrix(2,0), std::pow( rotationMatrix(2,1)*rotationMatrix(2,1) +rotationMatrix(2,2)*rotationMatrix(2,2) ,0.5 ) ) <<std::endl; std::cout<<"yaw is Pi/" <<M_PI/atan2( rotationMatrix(1,0),rotationMatrix(0,0) ) <<std::endl; |

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