Kevin Zakka
bddc4b88b2
PiperOrigin-RevId: 514360878 Change-Id: If119beec09d7eae568d8f6d8e3fa150ec7de88b6
116 lines
4.6 KiB
C
116 lines
4.6 KiB
C
// Copyright 2021 DeepMind Technologies Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MUJOCO_SRC_ENGINE_ENGINE_UTIL_SPATIAL_H_
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#define MUJOCO_SRC_ENGINE_ENGINE_UTIL_SPATIAL_H_
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#include <mujoco/mjexport.h>
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#include <mujoco/mjmodel.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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//------------------------------ quaternion operations ---------------------------------------------
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// rotate vector by quaternion
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MJAPI void mju_rotVecQuat(mjtNum res[3], const mjtNum vec[3], const mjtNum quat[4]);
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// compute conjugate quaternion, corresponding to opposite rotation
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MJAPI void mju_negQuat(mjtNum res[4], const mjtNum quat[4]);
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// multiply quaternions
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MJAPI void mju_mulQuat(mjtNum res[4], const mjtNum quat1[4], const mjtNum quat2[4]);
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// multiply quaternion and axis
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MJAPI void mju_mulQuatAxis(mjtNum res[4], const mjtNum quat[4], const mjtNum axis[3]);
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// convert axisAngle to quaternion
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MJAPI void mju_axisAngle2Quat(mjtNum res[4], const mjtNum axis[3], mjtNum angle);
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// convert quaternion (corresponding to orientation difference) to 3D velocity
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MJAPI void mju_quat2Vel(mjtNum res[3], const mjtNum quat[4], mjtNum dt);
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// subtract quaternions, convert to 3D velocity: qb*quat(res) = qa
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MJAPI void mju_subQuat(mjtNum res[3], const mjtNum qa[4], const mjtNum qb[4]);
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// convert quaternion to 3D rotation matrix
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MJAPI void mju_quat2Mat(mjtNum res[9], const mjtNum quat[4]);
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// convert 3D rotation matrix to quaternion
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MJAPI void mju_mat2Quat(mjtNum quat[4], const mjtNum mat[9]);
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// time-derivative of quaternion, given 3D rotational velocity
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MJAPI void mju_derivQuat(mjtNum res[4], const mjtNum quat[4], const mjtNum vel[3]);
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// integrate quaternion given 3D angular velocity
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MJAPI void mju_quatIntegrate(mjtNum quat[4], const mjtNum vel[3], mjtNum scale);
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// compute quaternion performing rotation from z-axis to given vector
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MJAPI void mju_quatZ2Vec(mjtNum quat[4], const mjtNum vec[3]);
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//------------------------------ pose operations (pos, quat) ---------------------------------------
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// multiply two poses
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MJAPI void mju_mulPose(mjtNum posres[3], mjtNum quatres[4],
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const mjtNum pos1[3], const mjtNum quat1[4],
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const mjtNum pos2[3], const mjtNum quat2[4]);
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// compute conjugate pose, corresponding to the opposite spatial transformation
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MJAPI void mju_negPose(mjtNum posres[3], mjtNum quatres[4],
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const mjtNum pos[3], const mjtNum quat[4]);
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// transform vector by pose
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MJAPI void mju_trnVecPose(mjtNum res[3], const mjtNum pos[3], const mjtNum quat[4],
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const mjtNum vec[3]);
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//------------------------------ spatial algebra ---------------------------------------------------
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// vector cross-product, 3D
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MJAPI void mju_cross(mjtNum res[3], const mjtNum a[3], const mjtNum b[3]);
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// cross-product for motion vector
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void mju_crossMotion(mjtNum res[6], const mjtNum vel[6], const mjtNum v[6]);
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// cross-product for force vectors
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void mju_crossForce(mjtNum res[6], const mjtNum vel[6], const mjtNum f[6]);
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// express inertia in com-based frame
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void mju_inertCom(mjtNum res[10], const mjtNum inert[3], const mjtNum mat[9],
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const mjtNum dif[3], mjtNum mass);
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// express motion axis in com-based frame
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void mju_dofCom(mjtNum res[6], const mjtNum axis[3], const mjtNum offset[3]);
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// multiply 6D vector (rotation, translation) by 6D inertia matrix
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void mju_mulInertVec(mjtNum res[6], const mjtNum inert[10], const mjtNum vec[6]);
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// multiply dof matrix by vector
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void mju_mulDofVec(mjtNum* res, const mjtNum* mat, const mjtNum* vec, int n);
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// coordinate transform of 6D motion or force vector in rotation:translation format
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// rotnew2old is 3-by-3, NULL means no rotation; flg_force specifies force or motion type
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MJAPI void mju_transformSpatial(mjtNum res[6], const mjtNum vec[6], int flg_force,
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const mjtNum newpos[3], const mjtNum oldpos[3],
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const mjtNum rotnew2old[9]);
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// make 3D frame given X axis (and possibly Y axis)
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void mju_makeFrame(mjtNum frame[9]);
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#ifdef __cplusplus
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}
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#endif
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#endif // MUJOCO_SRC_ENGINE_ENGINE_UTIL_SPATIAL_H_
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