Yuval Tassa
a264d0bc8b
https://youtu.be/GioWwB36XHI The new geom attribute adhesion (units of force, signed; pair-level override) translates the contact friction cone along its normal so that the force origin lies strictly inside it. Consequences: each contact can pull with up to the given force before breaking, and the tangential friction budget becomes mu*(f_N + adhesion) -- the Mohr-Coulomb yield condition with cohesion c = mu*adhesion -- so lightly-squeezed grasps retain a guaranteed friction floor. A translated cone factors exactly into {constant attractive force} + {original cone}, so no solver kernels change. The implementation is this factorization: a constant attraction along contact normals accumulated into the new mjData.qfrc_adhesion (summed into qfrc_passive), plus a bias of adhesive contact rows' reference acceleration (aref += R*adhesion), which makes resting penetration exactly independent of adhesion. Contacts of adhesive pairs remain active throughout the gap zone, producing rows with positive violation whose reference acceleration pulls: a tether that resists pull-off smoothly, captures objects released within the band into steady contact, and detaches at the specified force. Adhesion values of the two geoms combine by sum; explicit pairs override. mj_contactForce reports the net interface force (cone force minus the adhesive pull), whose normal component can now be negative. Negative adhesion is allowed and produces a repulsive offset (air hockey). PiperOrigin-RevId: 950858148 Change-Id: I879c08eba7ae501e5c0f8c2f807167344da4c2bc
453 lines
25 KiB
C
453 lines
25 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_MJDATA_H_
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#define MUJOCO_MJDATA_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <mujoco/mjtype.h>
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#include <mujoco/mjmodel.h>
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//------------------------------------- Contact ----------------------------------------------------
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typedef struct mjPreContact_ { // contact parameters set by narrowphase collision functions
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mjtNum dist;
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mjtNum pos[3];
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mjtNum normal[3]; // contact normal of the collision
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mjtNum tangent[3]; // first tangent direction
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} mjPreContact;
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typedef struct mjContact_ { // result of collision detection functions
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// contact parameters set by narrowphase collision function
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mjtNum dist; // distance between nearest points; neg: penetration
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mjtNum pos[3]; // position of contact point: midpoint between geoms
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mjtNum frame[9]; // normal is in [0-2], points from geom[0] to geom[1]
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// contact parameters set by mj_collideGeoms
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mjtNum includemargin; // margin for force generation
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mjtNum friction[5]; // tangent1, 2, spin, roll1, 2
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mjtNum solref[mjNREF]; // constraint solver reference, normal direction
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mjtNum solreffriction[mjNREF]; // constraint solver reference, friction directions
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mjtNum solimp[mjNIMP]; // constraint solver impedance
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mjtNum adhesion; // adhesive force along the contact normal
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// internal storage used by solver
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mjtNum mu; // friction of regularized cone, set by mj_makeConstraint
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mjtNum H[36]; // cone Hessian, set by mj_constraintUpdate
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// contact descriptors set by mj_collideXXX
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int dim; // contact space dimensionality: 1, 3, 4 or 6
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int geom1; // id of geom 1; deprecated, use geom[0]
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int geom2; // id of geom 2; deprecated, use geom[1]
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int geom[2]; // geom ids; -1 for flex
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int flex[2]; // flex ids; -1 for geom
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int elem[2]; // element ids; -1 for geom or flex vertex
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int vert[2]; // vertex ids; -1 for geom or flex element
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// flag set by mj_setContact or mj_instantiateContact
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int exclude; // 0: include, 1: in gap, 2: fused, 3: no dofs, 4: passive
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// address computed by mj_instantiateContact
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int efc_address; // address in efc; -1: not included
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} mjContact;
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//---------------------------------- diagnostics ---------------------------------------------------
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typedef struct mjWarningStat_ { // warning statistics
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int lastinfo; // info from last warning
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int number; // how many times was warning raised
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} mjWarningStat;
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typedef struct mjTimerStat_ { // timer statistics
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mjtNum duration; // cumulative duration
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int number; // how many times was timer called
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} mjTimerStat;
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typedef struct mjSolverStat_ { // per-iteration solver statistics
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mjtNum improvement; // cost reduction, scaled by 1/trace(M(qpos0))
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mjtNum gradient; // gradient norm (primal only, scaled)
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mjtNum lineslope; // slope in linesearch
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int nactive; // number of active constraints
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int nchange; // number of constraint state changes
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int neval; // number of cost evaluations in line search
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int nupdate; // number of Cholesky updates in line search
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} mjSolverStat;
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//---------------------------------- mjData --------------------------------------------------------
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typedef struct mjData_ {
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// constant sizes
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mjtSize narena; // size of the arena in bytes (inclusive of the stack)
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mjtSize nbuffer; // size of main buffer in bytes
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int nplugin; // number of plugin instances
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// stack pointer
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size_t pstack; // first available byte in stack (mutable)
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size_t pbase; // value of pstack when mj_markStack was last called (mutable)
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// arena pointer
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size_t parena; // first available byte in arena
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// threading
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uintptr_t threadpool; // thread pool pointer
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mjtBool threadlock; // disable stack freeing during threaded execution
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// memory utilization statistics
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mjtSize maxuse_stack; // maximum stack allocation in bytes (mutable)
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mjtSize maxuse_arena; // maximum arena allocation in bytes
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int maxuse_con; // maximum number of contacts
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int maxuse_efc; // maximum number of scalar constraints
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// solver statistics
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mjSolverStat solver[mjNISLAND*mjNSOLVER]; // solver statistics per island, per iteration
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int solver_niter[mjNISLAND]; // number of solver iterations, per island
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int solver_nnz[mjNISLAND]; // number of nonzeros in solver matrix, per island
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mjtNum solver_fwdinv[2]; // forward-inverse comparison: qfrc, efc
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// diagnostics
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mjWarningStat warning[mjNWARNING]; // warning statistics (mutable)
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mjTimerStat timer[mjNTIMER]; // timer statistics
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// variable sizes
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int ncon; // number of detected contacts
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int ne; // number of equality constraints
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int nf; // number of friction constraints
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int nl; // number of limit constraints
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int nefc; // number of constraints
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int nJ; // number of non-zeros in constraint Jacobian
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int efm_active; // implicit effective metric M+K: 0 inactive, 1 active, 2 active + preconditioner exact
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int nefmK; // number of non-zeros in effective-stiffness CSR
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int nefmdof; // number of rows in effective-metric factor
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int nefmL; // number of non-zeros in the effective-metric factor
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int nY; // number of non-zeros in constraint inverse inertia square root
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int nA; // number of non-zeros in constraint inverse inertia matrix
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int nisland; // number of detected constraint islands
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int nidof; // number of dofs in all islands
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int ntree_awake; // number of awake trees
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int nbody_awake; // number of awake dynamic and static bodies
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int nparent_awake; // number of bodies with awake parents
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int nv_awake; // number of awake dofs
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// flags marking lazily evaluated stages
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mjtBool flg_energypos; // has mj_energyPos been called
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mjtBool flg_energyvel; // has mj_energyVel been called
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mjtBool flg_subtreevel; // has mj_subtreeVel been called
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mjtBool flg_rnepost; // has mj_rnePostConstraint been called
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// global properties
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mjtNum time; // simulation time
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mjtNum energy[2]; // potential, kinetic energy
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//-------------------- end of info header
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// buffers
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void* buffer; // main buffer; all pointers point in it (nbuffer bytes)
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void* arena; // arena+stack buffer (narena bytes)
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//-------------------- main inputs and outputs of the computation
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// state
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mjtNum* qpos; // position (nq x 1)
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mjtNum* qvel; // velocity (nv x 1)
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mjtNum* act; // actuator activation (na x 1)
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mjtNum* history; // history buffer (nhistory x 1)
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mjtNum* qacc_warmstart; // acceleration used for warmstart (nv x 1)
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mjtNum* plugin_state; // plugin state (npluginstate x 1)
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// control
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mjtNum* ctrl; // control (nu x 1)
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mjtNum* qfrc_applied; // applied generalized force (nv x 1)
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mjtNum* xfrc_applied; // applied Cartesian force/torque (nbody x 6)
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mjtBool* eq_active; // enable/disable constraints (neq x 1)
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// mocap data
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mjtNum* mocap_pos; // positions of mocap bodies (nmocap x 3)
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mjtNum* mocap_quat; // orientations of mocap bodies (nmocap x 4)
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// dynamics
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mjtNum* qacc; // acceleration (nv x 1)
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mjtNum* act_dot; // time-derivative of actuator activation (na x 1)
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// user data
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mjtNum* userdata; // user data, not touched by engine (nuserdata x 1)
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// sensors
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mjtNum* sensordata; // sensor data array (nsensordata x 1)
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// sleep state
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int* tree_asleep; // <0: awake; >=0: index cycle of sleeping trees (ntree x 1)
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// plugins
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int* plugin; // copy of m->plugin, required for deletion (nplugin x 1)
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uintptr_t* plugin_data; // pointer to plugin-managed data structure (nplugin x 1)
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//-------------------- POSITION dependent
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// computed by mj_fwdPosition/mj_kinematics
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mjtNum* xpos; // Cartesian position of body frame (nbody x 3)
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mjtNum* xquat; // Cartesian orientation of body frame (nbody x 4)
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mjtNum* xmat; // Cartesian orientation of body frame (nbody x 9)
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mjtNum* xipos; // Cartesian position of body com (nbody x 3)
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mjtNum* ximat; // Cartesian orientation of body inertia (nbody x 9)
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mjtNum* xanchor; // Cartesian position of joint anchor (njnt x 3)
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mjtNum* xaxis; // Cartesian joint axis (njnt x 3)
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mjtNum* geom_xpos; // Cartesian geom position (ngeom x 3)
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mjtNum* geom_xmat; // Cartesian geom orientation (ngeom x 9)
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mjtNum* site_xpos; // Cartesian site position (nsite x 3)
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mjtNum* site_xmat; // Cartesian site orientation (nsite x 9)
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mjtNum* cam_xpos; // Cartesian camera position (ncam x 3)
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mjtNum* cam_xmat; // Cartesian camera orientation (ncam x 9)
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mjtNum* light_xpos; // Cartesian light position (nlight x 3)
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mjtNum* light_xdir; // Cartesian light direction (nlight x 3)
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// computed by mj_fwdPosition/mj_comPos
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mjtNum* subtree_com; // center of mass of each subtree (nbody x 3)
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mjtNum* cdof; // com-based motion axis of each dof (rot:lin) (nv x 6)
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mjtNum* cinert; // com-based body inertia and mass (nbody x 10)
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// computed by mj_fwdPosition/mj_flex
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mjtNum* flexvert_xpos; // Cartesian flex vertex positions (nflexvert x 3)
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mjtNum* flexelem_aabb; // flex element bounding boxes (center, size) (nflexelem x 6)
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mjtNum* flexelem_krot; // corotated element stiffness (implicit only) (nflexstiffness x 1)
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mjtNum* flexedge_J; // flex edge Jacobian (nJfe x 1)
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mjtNum* flexedge_length; // flex edge lengths (nflexedge x 1)
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mjtNum* flexvert_J; // flex vertex Jacobian (nJfv x 2)
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mjtNum* flexvert_length; // flex vertex lengths (nflexvert x 2)
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mjtNum* bvh_aabb_dyn; // global bounding box (center, size) (nbvhdynamic x 6)
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// computed by mj_fwdPosition/mj_tendon
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int* ten_wrapadr; // start address of tendon's path (ntendon x 1)
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int* ten_wrapnum; // number of wrap points in path (ntendon x 1)
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mjtNum* ten_J; // tendon Jacobian (nJten x 1)
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mjtNum* ten_length; // tendon lengths (ntendon x 1)
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int* wrap_obj; // geom id; -1: site; -2: pulley (nwrap x 2)
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mjtNum* wrap_xpos; // Cartesian 3D points in all paths (nwrap x 6)
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// computed by mj_fwdPosition/mj_transmission
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mjtNum* actuator_length; // actuator lengths, one per force output (nout x 1)
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int* moment_rownnz; // number of non-zeros in actuator_moment row (nout x 1)
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int* moment_rowadr; // row start address in colind array (nout x 1)
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int* moment_colind; // column indices in sparse Jacobian (nJmom x 1)
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mjtNum* actuator_moment; // actuator moments (nJmom x 1)
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// computed by mj_fwdPosition/mj_makeM
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mjtNum* crb; // com-based composite inertia and mass (nbody x 10)
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mjtNum* M; // inertia (sparse) (nC x 1)
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// computed by mj_fwdPosition/mj_factorM
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mjtNum* qLD; // L'*D*L factorization of M (sparse) (nC x 1)
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mjtNum* qLDiagInv; // 1/diag(D) (nv x 1)
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// computed by mj_collision/mj_collideTree
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mjtBool* bvh_active; // was bounding volume checked for collision (nbvh x 1)
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// computed by mj_updateSleep
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int* tree_awake; // is tree awake; 0: asleep; 1: awake (ntree x 1)
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int* body_awake; // body sleep state (mjtSleepState) (nbody x 1)
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int* body_awake_ind; // indices of awake and static bodies (nbody x 1)
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int* parent_awake_ind; // indices of bodies with awake or static parents (nbody x 1)
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int* dof_awake_ind; // indices of awake dofs (nv x 1)
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//-------------------- POSITION, VELOCITY dependent
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// computed by mj_fwdVelocity
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mjtNum* flexedge_velocity; // flex edge velocities (nflexedge x 1)
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mjtNum* ten_velocity; // tendon velocities (ntendon x 1)
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mjtNum* actuator_velocity; // actuator velocities, one per force output (nout x 1)
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// computed by mj_fwdVelocity/mj_comVel
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mjtNum* cvel; // com-based velocity (rot:lin) (nbody x 6)
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mjtNum* cdof_dot; // time-derivative of cdof (rot:lin) (nv x 6)
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// computed by mj_fwdVelocity/mj_rne (without acceleration)
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mjtNum* qfrc_bias; // C(qpos,qvel) (nv x 1)
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// computed by mj_fwdVelocity/mj_passive
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mjtNum* qfrc_spring; // passive spring force (nv x 1)
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mjtNum* qfrc_damper; // passive damper force (nv x 1)
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mjtNum* qfrc_gravcomp; // passive gravity compensation force (nv x 1)
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mjtNum* qfrc_fluid; // passive fluid force (nv x 1)
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mjtNum* qfrc_adhesion; // passive contact adhesion force (nv x 1)
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mjtNum* qfrc_passive; // total passive force (nv x 1)
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// computed by mj_sensorVel/mj_subtreeVel if needed
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mjtNum* subtree_linvel; // linear velocity of subtree com (nbody x 3)
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mjtNum* subtree_angmom; // angular momentum about subtree com (nbody x 3)
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// computed by mj_Euler or mj_implicit
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mjtNum* qH; // L'*D*L factorization of modified M (nC x 1)
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mjtNum* qHDiagInv; // 1/diag(D) of modified M (nv x 1)
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// computed by mj_implicit/mj_derivative
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mjtNum* qDeriv; // d (passive + actuator - bias) / d qvel (nD x 1)
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// computed by mj_implicit/mju_factorLUSparse
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mjtNum* qLU; // sparse LU of (M - dt*qDeriv) (nD x 1)
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//-------------------- POSITION, VELOCITY, CONTROL/ACCELERATION dependent
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// computed by mj_fwdActuation
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mjtNum* actuator_force; // actuator force in actuation space (nout x 1)
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mjtNum* qfrc_actuator; // actuator force in joint space (nv x 1)
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// computed by mj_fwdAcceleration
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mjtNum* qfrc_smooth; // net unconstrained force (nv x 1)
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mjtNum* qacc_smooth; // unconstrained acceleration (nv x 1)
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// computed by mj_fwdConstraint/mj_inverse
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mjtNum* qfrc_constraint; // constraint force (nv x 1)
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// computed by mj_inverse
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mjtNum* qfrc_inverse; // net external force; should equal:
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// qfrc_applied + J'*xfrc_applied + qfrc_actuator (nv x 1)
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// computed by mj_sensorAcc/mj_rnePostConstraint if needed; rotation:translation format
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mjtNum* cacc; // com-based acceleration (nbody x 6)
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mjtNum* cfrc_int; // com-based interaction force with parent (nbody x 6)
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mjtNum* cfrc_ext; // com-based external force on body (nbody x 6)
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//-------------------- arena-allocated: POSITION dependent
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// computed by mj_collision
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mjContact* contact; // array of all detected contacts (ncon x 1)
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// computed by mj_makeConstraint
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int* efc_type; // constraint type (mjtConstraint) (nefc x 1)
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int* efc_id; // id of object of specified type (nefc x 1)
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int* efc_J_rownnz; // number of non-zeros in constraint Jacobian row (nefc x 1)
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int* efc_J_rowadr; // row start address in colind array (nefc x 1)
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int* efc_J_rowsuper; // number of subsequent rows in supernode (nefc x 1)
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int* efc_J_colind; // column indices in constraint Jacobian (nJ x 1)
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mjtNum* efc_J; // constraint Jacobian (nJ x 1)
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mjtNum* efc_pos; // constraint position (equality, contact) (nefc x 1)
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mjtNum* efc_margin; // inclusion margin (contact) (nefc x 1)
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mjtNum* efc_frictionloss; // frictionloss (friction) (nefc x 1)
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mjtNum* efc_diagA; // diagonal of A matrix, approximate or exact (nefc x 1)
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mjtNum* efc_KBIP; // stiffness, damping, impedance, imp' (nefc x 4)
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mjtNum* efc_D; // constraint mass (nefc x 1)
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mjtNum* efc_R; // inverse constraint mass (nefc x 1)
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int* tendon_efcadr; // first efc address involving tendon; -1: none (ntendon x 1)
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// computed by mj_island (island tree structure)
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int* tree_island; // island id of this tree; -1: none (ntree x 1)
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int* island_ntree; // number of trees in this island (nisland x 1)
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int* island_itreeadr; // island start address in itree vector (nisland x 1)
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int* map_itree2tree; // map from itree to tree (ntree x 1)
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// computed by mj_island (island dof structure)
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int* dof_island; // island id of this dof; -1: none (nv x 1)
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int* island_nv; // number of dofs in this island (nisland x 1)
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int* island_idofadr; // island start address in idof vector (nisland x 1)
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int* island_dofadr; // island start address in dof vector (nisland x 1)
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int* map_dof2idof; // map from dof to idof (nv x 1)
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int* map_idof2dof; // map from idof to dof; >= nidof: unconstrained (nv x 1)
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// computed by mj_island (dofs sorted by island)
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mjtNum* ifrc_smooth; // net unconstrained force (nidof x 1)
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mjtNum* iacc_smooth; // unconstrained acceleration (nidof x 1)
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mjtNum* iacc; // acceleration (nidof x 1)
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// computed by mj_island (island constraint structure)
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int* efc_island; // island id of this constraint (nefc x 1)
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int* island_ne; // number of equality constraints in island (nisland x 1)
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int* island_nf; // number of friction constraints in island (nisland x 1)
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int* island_nefc; // number of constraints in island (nisland x 1)
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int* island_iefcadr; // start address in iefc vector (nisland x 1)
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int* map_efc2iefc; // map from efc to iefc (nefc x 1)
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int* map_iefc2efc; // map from iefc to efc (nefc x 1)
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// computed by mj_island (constraints sorted by island)
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int* iefc_type; // constraint type (mjtConstraint) (nefc x 1)
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int* iefc_id; // id of object of specified type (nefc x 1)
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mjtNum* iefc_frictionloss; // frictionloss (friction) (nefc x 1)
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mjtNum* iefc_D; // constraint mass (nefc x 1)
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mjtNum* iefc_R; // inverse constraint mass (nefc x 1)
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// computed by mj_projectConstraint (PGS solver)
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int* efc_Y_rownnz; // number of non-zeros in Y row (nefc x 1)
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int* efc_Y_rowadr; // row start address in Y colind array (nefc x 1)
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int* efc_Y_colind; // column indices in sparse Y (nY x 1)
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mjtNum* efc_Y; // whitened Jacobian Y = J*M^(-1/2) (nY x 1)
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int* efc_AR_rownnz; // number of non-zeros in AR (nefc x 1)
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int* efc_AR_rowadr; // row start address in AR colind array (nefc x 1)
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int* efc_AR_colind; // column indices in sparse AR (nA x 1)
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mjtNum* efc_AR; // J*inv(M)*J' + R (nA x 1)
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//-------------------- arena-allocated: POSITION, VELOCITY dependent
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// computed by mj_fwdVelocity/mj_referenceConstraint
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mjtNum* efc_vel; // velocity in constraint space: J*qvel (nefc x 1)
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mjtNum* efc_aref; // reference pseudo-acceleration (nefc x 1)
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// computed by mj_fwdPosition/mj_invPosition when the implicit effective metric M+K is active
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mjtNum* efm_c; // smooth-force shift h*K*qvel (nv x 1)
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int* efm_K_rownnz; // effective-stiffness CSR row nonzeros (nv x 1)
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int* efm_K_rowadr; // effective-stiffness CSR row addresses (nv x 1)
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int* efm_K_colind; // effective-stiffness CSR column indices (nefmK x 1)
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mjtNum* efm_K_val; // effective-stiffness CSR values (nefmK x 1)
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int* efm_dofid; // factor row -> dof address (nefmdof x 1)
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int* efm_L_rownnz; // factor row nonzeros (nefmdof x 1)
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int* efm_L_rowadr; // factor row addresses (nefmdof x 1)
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int* efm_L_colind; // factor column indices (nefmL x 1)
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mjtNum* efm_L; // Cholesky factor of diag(M)+K, covered dofs (nefmL x 1)
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//-------------------- arena-allocated: POSITION, VELOCITY, CONTROL/ACCELERATION dependent
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// computed by mj_fwdConstraint/mj_inverse
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mjtNum* efc_b; // linear cost term: J*qacc_smooth - aref (nefc x 1)
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mjtNum* iefc_aref; // reference pseudo-acceleration (nefc x 1)
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int* iefc_state; // constraint state (mjtConstraintState) (nefc x 1)
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mjtNum* iefc_force; // constraint force in constraint space (nefc x 1)
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int* efc_state; // constraint state (mjtConstraintState) (nefc x 1)
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mjtNum* efc_force; // constraint force in constraint space (nefc x 1)
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mjtNum* ifrc_constraint; // constraint force (nidof x 1)
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// compilation signature
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uint64_t signature; // also held by the mjSpec that compiled the model
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} mjData;
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//---------------------------------- callback function types ---------------------------------------
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// generic MuJoCo function
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typedef void (*mjfGeneric)(const mjModel* m, mjData* d);
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// contact filter: 1- discard, 0- collide
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typedef int (*mjfConFilt)(const mjModel* m, mjData* d, int geom1, int geom2);
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// sensor simulation
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typedef void (*mjfSensor)(const mjModel* m, mjData* d, int stage);
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// timer
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typedef mjtNum (*mjfTime)(void);
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// actuator dynamics, gain, bias
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typedef mjtNum (*mjfAct)(const mjModel* m, const mjData* d, int id);
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// collision detection
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typedef int (*mjfCollision)(const mjModel* m, mjData* d, mjPreContact* con, int g1, int g2,
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mjtNum margin);
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#endif // MUJOCO_MJDATA_H_
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