Class inertialsim::geometry::Rotation¶
ClassList > inertialsim > geometry > Rotation
3-dimensional rotations of rigid bodies, SO(3) .More...
#include <rotation.h>
Inherits the following classes: inertialsim::geometry::RotationBase
Public Types inherited from inertialsim::geometry::RotationBase¶
See inertialsim::geometry::RotationBase
| Type | Name |
|---|---|
| typedef MatrixLieGroup< Derived, 3, 3 > | Base |
Public Types inherited from inertialsim::geometry::MatrixLieGroup¶
See inertialsim::geometry::MatrixLieGroup
| Type | Name |
|---|---|
| typedef Eigen::Matrix< Scalar, AlgebraDimension, Eigen::Dynamic > | AlgebraArray Array of algebra elements. |
| typedef Eigen::Matrix< Scalar, AlgebraDimension, 1 > | AlgebraElement Algebra element type (vector). |
| typedef std::vector< GroupElement > | GroupArray Array of group elements. |
| typedef Eigen::Matrix< Scalar, GroupDimension, GroupDimension > | GroupElement Group element type (square matrix). |
| typedef Eigen::Matrix< Scalar, AlgebraDimension, AlgebraDimension > | JacobianMatrix Jacobian matrix (algebra to algebra). |
| typedef std::vector< JacobianMatrix > | JacobianMatrixArray Array of Jacobian matrices. |
Public Functions inherited from inertialsim::geometry::RotationBase¶
See inertialsim::geometry::RotationBase
| Type | Name |
|---|---|
| AxisAngle | AsAxisAngle () const Return axis and angle representation. |
| EulerAngles | AsEuler (const std::string & sequence) const Return the Euler angle representation. |
| const RotationMatrixArray & | AsMatrix () const Return the rotation matrix representation. |
| Quaternion | AsQuaternion () const Return the quaternion representation. |
| RotationVector | AsRotationVector () const Return the rotation vector representation. |
| RotationVector | Error (const RotationBase< OtherDerived > & reference) const Calculate error compared to a reference rotation. |
| int | num_rotations () const Number of rotations stored. |
Public Functions inherited from inertialsim::geometry::MatrixLieGroup¶
See inertialsim::geometry::MatrixLieGroup
| Type | Name |
|---|---|
| Vector3D | Apply (const Vector3D & vectors) const Apply the group action to an array of vectors. |
| Derived | Interpolate (const Timestamps & interp_time, Interpolator method=Interpolator::LINEAR) const Interpolate at given times. |
| Derived | Inverse () const Invert an instance. |
| Derived | Slice (int start, int end) const Get a slice of elements. |
| AlgebraArray | TimeDerivative (int order=1, int accuracy=4, const std::string & side="right") const Compute time derivative using finite differences. |
| int | num_elements () const Number of elements stored in the instance. |
| Derived | operator* (const Derived & rhs) const Compose elements of the group. |
| Derived | operator[] (int index) const Get a single element by index. |
| const std::optional< Timestamps > & | time () const Time array corresponding to each element. |
| virtual | ~MatrixLieGroup () = default |
Public Static Functions inherited from inertialsim::geometry::RotationBase¶
See inertialsim::geometry::RotationBase
| Type | Name |
|---|---|
| RotationMatrixArray | DoubleIntegralFactor (const RotationVector & rotation_vectors) Double integral factor. |
| Derived | FromAxisAngle (const Vector3D & axis, const Scalar1D & angle, const std::optional< Timestamps > & time=std::nullopt) Construct a Rotation from an axis and angle. |
| Derived | FromEuler (const EulerAngles & euler, const std::string & sequence, const std::optional< Timestamps > & time=std::nullopt) Construct a Rotation from a sequence of Euler angles. |
| Derived | FromMatrix (const RotationMatrixArray & matrices, const std::optional< Timestamps > & time=std::nullopt, bool orthonormalize=false) Construct a Rotation from rotation matrices. |
| Derived | FromQuaternion (const Quaternion & quaternions, const std::optional< Timestamps > & time=std::nullopt, bool scalar_last=false) Construct a Rotation from quaternions. |
| Derived | FromRotationVector (const RotationVector & rotation_vectors, const std::optional< Timestamps > & time=std::nullopt) Construct a Rotation from rotation vectors. |
| RotationMatrixArray | IntegralFactor (const RotationVector & rotation_vectors) First integral factor. |
Public Static Functions inherited from inertialsim::geometry::MatrixLieGroup¶
See inertialsim::geometry::MatrixLieGroup
| Type | Name |
|---|---|
| Derived | Compose (const std::vector< Derived > & instances) Compose a sequence of instances (first to last). |
| Derived | FromIdentity (int num_elements=1) Create identity elements. |
| Derived | FromRandom (int num_elements=1, std::optional< Eigen::numext::uint64_t > seed=std::nullopt) Create random elements. |
Protected Functions inherited from inertialsim::geometry::RotationBase¶
See inertialsim::geometry::RotationBase
| Type | Name |
|---|---|
| RotationBase () Default constructor. |
|
| RotationBase (const RotationMatrixArray & matrices, const std::optional< Timestamps > & time=std::nullopt) Construct from rotation matrices. |
Protected Functions inherited from inertialsim::geometry::MatrixLieGroup¶
See inertialsim::geometry::MatrixLieGroup
| Type | Name |
|---|---|
| AlgebraArray | AsAlgebra () const Get the algebra elements. |
| GroupArray | AsGroup () const Get the group elements. |
| MatrixLieGroup (const std::optional< Timestamps > & time=std::nullopt) Constructor. |
|
| int | num_times () const |
Protected Static Functions inherited from inertialsim::geometry::MatrixLieGroup¶
See inertialsim::geometry::MatrixLieGroup
| Type | Name |
|---|---|
| GroupElement | Exp (const AlgebraElement & vector) Exponential map from algebra to group. |
| Derived | FromAlgebra (const AlgebraArray & elements, const std::optional< Timestamps > & time) Create instance from algebra elements. |
| Derived | FromGroup (const GroupArray & elements, const std::optional< Timestamps > & time) Create instance from group elements. |
| JacobianMatrixArray | Jacobian (const AlgebraArray & algebra, const std::string & side="left", bool inverse=false) Calculate the Jacobian of the exponential map. |
| AlgebraElement | Log (const GroupElement & element) Logarithm map from group to algebra. |
Detailed Description¶
Rotations can be constructed from any of the following representations: rotation matrix, Euler angles, quaternion, rotation vector, and axis angle. Use the From* methods to construct an instance.
Current state can be returned in any of the representations listed above using the As* methods.
Internally rotations are stored in rotation matrix format.
Rotation conventions
There are a large variety of rotation conventions and they are a common source of errors. Because many of these conventions cannot be automatically validated, users must be aware of them and manage interfaces with other software accordingly. InertialSim conventions are documented in each method.
Active vs passive rotation convention
Rotations stored in this class represent an active transformation. In the active convention, rotations act to rotate an object relative to a fixed coordinate system. The active convention is the standard mathematical description of rotations.
The alternative passive convention is supported in the CoordinateRotation subclass. In the passive convention, rotations act to transform the components of physical vectors to different coordinate systems. The passive convention is the standard for describing orientation in inertial navigation and aerospace applications.
Some references use the terminology alibi (active) and alias (passive). Reference [02], Reference [05], and Reference [11] discuss active vs. passive transforms in greater detail.
See also: CoordinateRotation for passive rotations.
See also: RigidTransform for combined rotation and translation.
The documentation for this class was generated from the following file cpp/include/inertialsim/geometry/rotation.h