Taylor Howell
9accc7ae51
PiperOrigin-RevId: 757678945 Change-Id: If236b9e8f376a2673abc87e818326e9188f6c15a
667 lines
21 KiB
C++
667 lines
21 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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// Tests for engine/engine_sensor.c.
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#include <vector>
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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#include <mujoco/mjmodel.h>
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#include <mujoco/mjtnum.h>
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#include <mujoco/mujoco.h>
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#include "src/engine/engine_util_blas.h"
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#include "src/engine/engine_util_spatial.h"
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#include "test/fixture.h"
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namespace mujoco {
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namespace {
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const mjtNum tol = 1e-14; // nearness tolerance for floating point numbers
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// returns as a vector the measured values from sensor with index `id`
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static std::vector<mjtNum> GetSensor(const mjModel* model,
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const mjData* data,
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int id) {
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return std::vector<mjtNum>(
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data->sensordata + model->sensor_adr[id],
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data->sensordata + model->sensor_adr[id] + model->sensor_dim[id]);
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}
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using ::testing::Pointwise;
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using ::testing::DoubleNear;
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using ::testing::StrEq;
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using SensorTest = MujocoTest;
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// --------------------- test sensor disableflag ------------------------------
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// hand-picked positions and orientations for simple expected values
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TEST_F(SensorTest, DisableSensors) {
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constexpr char xml[] = R"(
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<mujoco>
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<sensor>
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<clock/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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// before calling anything, check that sensors are initialised to 0
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EXPECT_EQ(data->sensordata[0], 0.0);
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// call mj_step, mj_step1, expect clock to be incremented by timestep
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mj_step(model, data);
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mj_step1(model, data);
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EXPECT_EQ(data->sensordata[0], model->opt.timestep);
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// disable sensors, call mj_step, mj_step1, expect clock to not increment
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model->opt.disableflags |= mjDSBL_SENSOR;
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mj_step(model, data);
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mj_step1(model, data);
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EXPECT_EQ(data->time, 2*model->opt.timestep);
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EXPECT_EQ(data->sensordata[0], model->opt.timestep);
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// re-enable sensors, call mj_step, mj_step1, expect clock to match time
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model->opt.disableflags = 0;
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mj_step(model, data);
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mj_step1(model, data);
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EXPECT_EQ(data->time, data->sensordata[0]);
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// --------------------- test relative frame sensors --------------------------
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using RelativeFrameSensorTest = MujocoTest;
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// hand-picked positions and orientations for simple expected values
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TEST_F(RelativeFrameSensorTest, ReferencePosMat) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body name="reference" pos="3 -4 0" xyaxes="4 3 0 -3 4 0"/>
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<site name="object" pos="4 3 0" xyaxes="3 -4 0 4 3 0"/>
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</worldbody>
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<sensor>
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<framepos objtype="site" objname="object"
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reftype="xbody" refname="reference"/>
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<framexaxis objtype="site" objname="object"
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reftype="xbody" refname="reference"/>
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<frameyaxis objtype="site" objname="object"
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reftype="xbody" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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mj_forward(model, data);
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// compare actual and expected values
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std::vector pos = GetSensor(model, data, 0);
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EXPECT_THAT(pos, Pointwise(DoubleNear(tol), {5, 5, 0}));
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std::vector xaxis = GetSensor(model, data, 1);
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EXPECT_THAT(xaxis, Pointwise(DoubleNear(tol), {0, -1, 0}));
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std::vector yaxis = GetSensor(model, data, 2);
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EXPECT_THAT(yaxis, Pointwise(DoubleNear(tol), {1, 0, 0}));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// orientations given by quaternion and by orientation matrix are identical
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TEST_F(RelativeFrameSensorTest, ReferenceQuatMat) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<site name="reference" euler="10 20 30"/>
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<site name="object" euler="20 40 60"/>
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</worldbody>
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<sensor>
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<framexaxis objtype="site" objname="object"
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reftype="site" refname="reference"/>
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<frameyaxis objtype="site" objname="object"
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reftype="site" refname="reference"/>
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<framezaxis objtype="site" objname="object"
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reftype="site" refname="reference"/>
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<framequat objtype="site" objname="object"
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reftype="site" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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// call mj_forward and convert orientation matrix to quaternion
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mj_forward(model, data);
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mjtNum mat[9], converted_quat[4];
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mju_transpose(mat, data->sensordata, 3, 3);
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mju_mat2Quat(converted_quat, mat);
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// compare quaternion sensor and quat derived from orientation matrix
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std::vector quat = GetSensor(model, data, 3);
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EXPECT_THAT(quat, Pointwise(DoubleNear(tol), converted_quat));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// compare global frame and initially co-located relative frame on same body
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TEST_F(RelativeFrameSensorTest, ReferencePosMatQuat) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body>
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<freejoint/>
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<site name="reference"/>
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<geom name="object" euler="20 40 60" pos="1 2 3" size="1"/>
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</body>
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</worldbody>
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<sensor>
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<framepos objtype="geom" objname="object"/>
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<framexaxis objtype="geom" objname="object"/>
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<frameyaxis objtype="geom" objname="object"/>
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<framezaxis objtype="geom" objname="object"/>
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<framequat objtype="geom" objname="object"/>
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<framepos objtype="geom" objname="object"
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reftype="site" refname="reference"/>
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<framexaxis objtype="geom" objname="object"
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reftype="site" refname="reference"/>
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<frameyaxis objtype="geom" objname="object"
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reftype="site" refname="reference"/>
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<framezaxis objtype="geom" objname="object"
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reftype="site" refname="reference"/>
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<framequat objtype="geom" objname="object"
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reftype="site" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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constexpr int nsensordata = 32;
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ASSERT_EQ(model->nsensordata, nsensordata);
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mjData* data = mj_makeData(model);
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// call mj_forward, save global sensors (colocated with reference frame)
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mj_forward(model, data);
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std::vector expected_values(data->sensordata, data->sensordata+nsensordata/2);
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// set qpos to arbitrary values, call mj_forward
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for (int i=0; i < 7; i++) {
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data->qpos[i] = i+1;
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}
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mj_forward(model, data);
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// get values from relative sensors after moving the object
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std::vector actual_values(data->sensordata+nsensordata/2,
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data->sensordata+nsensordata);
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// object and reference have moved together, we expect values to not change
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EXPECT_THAT(actual_values, Pointwise(DoubleNear(tol), expected_values));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// hand-picked velocities and orientations for simple expected values
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TEST_F(RelativeFrameSensorTest, FrameVelLinearFixed) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body xyaxes="1 -1 0 1 1 0">
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<joint type="slide" axis="1 0 0"/>
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<geom name="reference" size="1"/>
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</body>
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<body>
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<joint type="slide" axis="1 0 0"/>
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<geom name="object" size="1"/>
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</body>
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</worldbody>
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<sensor>
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<framelinvel objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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data->qvel[0] = mju_sqrt(2);
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data->qvel[1] = 1;
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mj_forward(model, data);
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// compare to expected values
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std::vector linvel = GetSensor(model, data, 0);
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const mjtNum expected_linvel[3] = {-mju_sqrt(0.5), mju_sqrt(0.5), 0};
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EXPECT_THAT(linvel, Pointwise(DoubleNear(tol), expected_linvel));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// object and reference in the same body, expect angular velocities to be zero
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TEST_F(RelativeFrameSensorTest, FrameVelAngFixed) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body>
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<joint type="hinge" axis="1 2 3"/>
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<geom name="reference" size="1" pos="1 2 3"/>
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<geom name="object" size="1" pos="-3 -2 -1"/>
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</body>
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</worldbody>
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<sensor>
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<frameangvel objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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// set joint velocities and call forward dynamics
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data->qvel[0] = 1;
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mj_forward(model, data);
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// obj and ref rotate together, relative angular velocities should be zero
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std::vector angvel = GetSensor(model, data, 0);
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EXPECT_THAT(angvel, Pointwise(DoubleNear(tol), {0, 0, 0}));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// object and reference rotate on the same global axis
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TEST_F(RelativeFrameSensorTest, FrameVelAngOpposing) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body xyaxes="0 -1 0 1 0 0">
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<joint type="hinge" axis="0 1 0"/>
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<geom name="reference" size="1"/>
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</body>
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<body>
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<joint type="hinge" axis="1 0 0"/>
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<geom name="object" size="1" pos="-3 -2 -1"/>
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</body>
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</worldbody>
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<sensor>
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<frameangvel objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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// set joint velocities and call forward dynamics
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data->qvel[0] = -1;
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data->qvel[1] = 1;
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mj_forward(model, data);
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// obj and ref rotate on same axis, we can just difference the velocities
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std::vector angvel = GetSensor(model, data, 0);
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const mjtNum expected_angvel[3] = {0, data->qvel[1]-data->qvel[0], 0};
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EXPECT_THAT(angvel, Pointwise(DoubleNear(tol), expected_angvel));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// two arbitrary frames, compare velocity sensors and fin-diffed positions
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TEST_F(RelativeFrameSensorTest, FrameVelGeneral) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body pos="1 2 3" euler="10 20 30">
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<joint type="hinge" axis="2 3 4"/>
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<geom name="reference" size="1" pos="0 1 2"/>
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</body>
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<body pos="-3 -2 -1" euler="20 40 60">
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<joint type="hinge" axis="2 3 4"/>
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<geom name="object" size="1" pos="1 2 3"/>
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</body>
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</worldbody>
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<sensor>
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<framepos objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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<framequat objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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<framelinvel objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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<frameangvel objtype="geom" objname="object"
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reftype="geom" refname="reference"/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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mjtNum dt = 1e-6; // timestep used for finite differencing
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// set (arbitrary) joint velocities and call forward dynamics
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data->qvel[0] = 1;
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data->qvel[1] = -1;
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mj_forward(model, data);
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// save measured linear and angular velocities as vectors
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std::vector linvel = GetSensor(model, data, 2);
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std::vector angvel = GetSensor(model, data, 3);
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// save current position, quaternion as arrays
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mjtNum pos0[3], quat0[4];
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mju_copy3(pos0, data->sensordata);
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mju_copy4(quat0, data->sensordata+3);
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// explicit Euler integration with small dt
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mju_addToScl(data->qpos, data->qvel, dt, 2);
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// call mj_forward again, save new position and quaternion
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mj_forward(model, data);
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mjtNum pos1[3], quat1[4];
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mju_copy3(pos1, data->sensordata);
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mju_copy4(quat1, data->sensordata+3);
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// compute expected linear velocities using finite differencing
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mjtNum linvel_findiff[3];
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mju_sub3(linvel_findiff, pos1, pos0);
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mju_scl3(linvel_findiff, linvel_findiff, 1/dt);
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// compute expected angular velocities using finite differencing
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mjtNum dquat[4], angvel_findiff[3];
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mju_negQuat(quat0, quat0);
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mju_mulQuat(dquat, quat1, quat0);
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mju_quat2Vel(angvel_findiff, dquat, dt);
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// compare analytic and finite-differenced relative velocities
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EXPECT_THAT(linvel, Pointwise(DoubleNear(10*dt), linvel_findiff));
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EXPECT_THAT(angvel, Pointwise(DoubleNear(10*dt), angvel_findiff));
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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// ------------------------- general sensor tests -----------------------------
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using SensorTest = MujocoTest;
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TEST_F(SensorTest, EnableEnergy) {
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constexpr char xml[] = R"(
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<mujoco>
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<option gravity="0 0 -5">
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<flag energy="enable"/>
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</option>
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<worldbody>
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<body pos="0 0 2">
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<geom size="1" mass="3"/>
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<freejoint/>
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</body>
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</worldbody>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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mj_forward(model, data);
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EXPECT_EQ(data->energy[0], 2*3*5);
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model->opt.enableflags &= ~mjENBL_ENERGY;
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mj_forward(model, data);
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EXPECT_EQ(data->energy[0], 0);
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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TEST_F(SensorTest, PotentialEnergy) {
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constexpr char xml[] = R"(
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<mujoco>
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<option gravity="0 0 -5"/>
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<worldbody>
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<body pos="0 0 2">
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<geom size="1" mass="3"/>
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<freejoint/>
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</body>
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</worldbody>
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<sensor>
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<e_potential/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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mj_forward(model, data);
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EXPECT_EQ(data->sensordata[0], 2*3*5);
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data->qpos[2] = 7;
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mj_forward(model, data);
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EXPECT_EQ(data->sensordata[0], 7*3*5);
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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TEST_F(SensorTest, PotentialEnergyFreeJointSpring) {
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constexpr char xml[] = R"(
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<mujoco>
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<option gravity="0 0 0"/>
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<worldbody>
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<body>
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<geom size="1" mass="3"/>
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<joint type="free" stiffness="2"/>
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</body>
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</worldbody>
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<sensor>
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<e_potential/>
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</sensor>
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</mujoco>
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)";
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mjModel* model = LoadModelFromString(xml);
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mjData* data = mj_makeData(model);
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data->qpos[0] = 1;
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data->qpos[1] = 2;
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data->qpos[2] = 3;
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mj_forward(model, data);
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EXPECT_EQ(data->sensordata[0], 0.5*2*14);
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mj_deleteData(data);
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mj_deleteModel(model);
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}
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TEST_F(SensorTest, KineticEnergy) {
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constexpr char xml[] = R"(
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<mujoco>
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<worldbody>
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<body pos="0 0 2">
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<geom size="1" mass="3"/>
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<freejoint/>
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</body>
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</worldbody>
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<sensor>
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|
<e_kinetic/>
|
|
</sensor>
|
|
</mujoco>
|
|
)";
|
|
mjModel* model = LoadModelFromString(xml);
|
|
mjData* data = mj_makeData(model);
|
|
|
|
while (data->time < 1.5) {
|
|
mj_step(model, data);
|
|
}
|
|
mj_forward(model, data);
|
|
|
|
mjtNum mass = 3;
|
|
mjtNum speed = data->time * mju_norm3(model->opt.gravity);
|
|
EXPECT_FLOAT_EQ(data->sensordata[0], 0.5 * mass * speed * speed);
|
|
|
|
mj_deleteData(data);
|
|
mj_deleteModel(model);
|
|
}
|
|
|
|
// test clock sensor
|
|
TEST_F(SensorTest, Clock) {
|
|
constexpr char xml[] = R"(
|
|
<mujoco>
|
|
<option timestep="1e-3"/>
|
|
<sensor>
|
|
<clock/>
|
|
<clock name="clampedclock" cutoff="3e-3"/>
|
|
</sensor>
|
|
</mujoco>
|
|
)";
|
|
mjModel* model = LoadModelFromString(xml);
|
|
mjData* data = mj_makeData(model);
|
|
|
|
// call step 4 times, checking that clock works as expected
|
|
for (int i=0; i < 5; i++) {
|
|
mj_step(model, data);
|
|
mj_step1(model, data); // update values of position-based sensors
|
|
EXPECT_EQ(data->sensordata[0], data->time);
|
|
EXPECT_EQ(data->sensordata[1], mju_min(data->time, 3e-3));
|
|
}
|
|
|
|
// check names
|
|
const char* name0 = mj_id2name(model, mjOBJ_SENSOR, 0);
|
|
EXPECT_EQ(name0, nullptr);
|
|
const char* name1 = mj_id2name(model, mjOBJ_SENSOR, 1);
|
|
EXPECT_THAT(name1, StrEq("clampedclock"));
|
|
|
|
mj_deleteData(data);
|
|
mj_deleteModel(model);
|
|
}
|
|
|
|
// test clock sensor
|
|
TEST_F(SensorTest, CollisionSequential) {
|
|
constexpr char xml[] = R"(
|
|
<mujoco>
|
|
<worldbody>
|
|
<geom name="plane" type="plane" size="1 1 1"/>
|
|
<geom name="sphere1" pos="0 0 1" size="0.2"/>
|
|
<geom name="sphere2" pos="1 0 1" size="0.3"/>
|
|
</worldbody>
|
|
<sensor>
|
|
<distance name="0" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<distance name="1" geom1="sphere2" geom2="plane" cutoff="1"/>
|
|
<distance name="2" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
<normal name="3" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<normal name="4" geom1="sphere2" geom2="plane" cutoff="1"/>
|
|
<normal name="5" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
<fromto name="6" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<fromto name="7" geom1="sphere2" geom2="plane" cutoff="1"/>
|
|
<fromto name="8" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
<!-- sequential sensors with identical signature -->
|
|
<distance name="9" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<fromto name="10" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<normal name="11" geom1="plane" geom2="sphere1" cutoff="1"/>
|
|
<normal name="12" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
<fromto name="13" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
<distance name="14" geom1="sphere1" geom2="sphere2" cutoff="1"/>
|
|
|
|
</sensor>
|
|
</mujoco>
|
|
)";
|
|
mjModel* model = LoadModelFromString(xml);
|
|
mjData* data = mj_makeData(model);
|
|
mj_forward(model, data);
|
|
|
|
EXPECT_DOUBLE_EQ(data->sensordata[0], 0.8);
|
|
EXPECT_DOUBLE_EQ(data->sensordata[1], 0.7);
|
|
EXPECT_DOUBLE_EQ(data->sensordata[2], 0.5);
|
|
|
|
mjtNum eps = 1e-14;
|
|
|
|
EXPECT_THAT(GetSensor(model, data, 3),
|
|
Pointwise(DoubleNear(eps), std::vector<mjtNum>{0, 0, 1}));
|
|
EXPECT_THAT(GetSensor(model, data, 4),
|
|
Pointwise(DoubleNear(eps), std::vector<mjtNum>{0, 0, -1}));
|
|
EXPECT_THAT(GetSensor(model, data, 5),
|
|
Pointwise(DoubleNear(eps), std::vector<mjtNum>{1, 0, 0}));
|
|
EXPECT_THAT(GetSensor(model, data, 6),
|
|
Pointwise(DoubleNear(eps),
|
|
std::vector<mjtNum>{0, 0, 0, 0, 0, .8}));
|
|
EXPECT_THAT(GetSensor(model, data, 7),
|
|
Pointwise(DoubleNear(eps),
|
|
std::vector<mjtNum>{1, 0, .7, 1, 0, 0}));
|
|
EXPECT_THAT(GetSensor(model, data, 8),
|
|
Pointwise(DoubleNear(eps),
|
|
std::vector<mjtNum>{.2, 0, 1, .7, 0, 1}));
|
|
|
|
EXPECT_THAT(GetSensor(model, data, 9),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 0)));
|
|
EXPECT_THAT(GetSensor(model, data, 10),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 6)));
|
|
EXPECT_THAT(GetSensor(model, data, 11),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 3)));
|
|
EXPECT_THAT(GetSensor(model, data, 12),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 5)));
|
|
EXPECT_THAT(GetSensor(model, data, 13),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 8)));
|
|
EXPECT_THAT(GetSensor(model, data, 14),
|
|
Pointwise(DoubleNear(eps), GetSensor(model, data, 2)));
|
|
|
|
mj_deleteData(data);
|
|
mj_deleteModel(model);
|
|
}
|
|
|
|
// ------------------------- camera sensor tests ------------------------------
|
|
|
|
// test clock sensor
|
|
TEST_F(SensorTest, CameraProjection) {
|
|
constexpr char xml[] = R"(
|
|
<mujoco>
|
|
<worldbody>
|
|
<body pos="1.1 0 1">
|
|
<geom type="box" size=".1 .6 .375"/>
|
|
<site name="frontorigin" pos="-.1 .6 .375"/>
|
|
<site name="frontcorner" pos="-.1 -.6 -.375"/>
|
|
</body>
|
|
<body pos="-1.1 0 1">
|
|
<geom type="box" size=".1 .6 .375"/>
|
|
<site name="backcenter" pos="-.1 0 0"/>
|
|
</body>
|
|
<camera pos="0 0 1" xyaxes="0 -1 0 0 0 1" fovy="41.11209"
|
|
resolution="1920 1200" name="fixedcamera"/>
|
|
</worldbody>
|
|
<sensor>
|
|
<camprojection site="frontorigin" camera="fixedcamera"/>
|
|
<camprojection site="frontcorner" camera="fixedcamera"/>
|
|
<camprojection site="backcenter" camera="fixedcamera"/>
|
|
</sensor>
|
|
</mujoco>
|
|
)";
|
|
mjModel* model = LoadModelFromString(xml);
|
|
mjData* data = mj_makeData(model);
|
|
|
|
// call step to update sensors
|
|
mj_step(model, data);
|
|
mj_step1(model, data); // update values of position-based sensors
|
|
EXPECT_THAT(model->cam_resolution[0], 1920);
|
|
EXPECT_THAT(model->cam_resolution[1], 1200);
|
|
mjtNum eps = 1e-4;
|
|
EXPECT_NEAR(data->sensordata[0], 0, eps);
|
|
EXPECT_NEAR(data->sensordata[1], 0, eps);
|
|
EXPECT_NEAR(data->sensordata[2], 1920, eps);
|
|
EXPECT_NEAR(data->sensordata[3], 1200, eps);
|
|
EXPECT_NEAR(data->sensordata[4], 960, eps);
|
|
EXPECT_NEAR(data->sensordata[5], 600, eps);
|
|
|
|
mj_deleteData(data);
|
|
mj_deleteModel(model);
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace mujoco
|