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Fix xyz and rpy offsets in fixed joint reduction #500

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merged 8 commits into from
Aug 30, 2021
Merged

Fix xyz and rpy offsets in fixed joint reduction #500

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9ca30cc
parse rpyOffset as radians
iche033 Feb 18, 2021
72381f1
update tf for xyz and rpy offsets
iche033 Feb 23, 2021
de3e268
remove inverse transform function in urdf parser
iche033 Feb 26, 2021
1e81e4a
Merge branch 'sdf6' into iche033/urdf_parser_plugin_frame
ahcorde Mar 30, 2021
9bffb10
Merge branch 'sdf6' into iche033/urdf_parser_plugin_frame
scpeters Jul 14, 2021
536b847
inject corrected_offets tag
iche033 Jul 16, 2021
2eba874
Fix tag removal logic
scpeters Jul 23, 2021
26deff0
Merge branch 'sdf6' into iche033/urdf_parser_plugin_frame
iche033 Aug 30, 2021
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33 changes: 2 additions & 31 deletions src/parser_urdf.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -219,10 +219,6 @@ std::string Values2str(unsigned int _count, const double *_values);

void CreateGeometry(TiXmlElement* _elem, urdf::GeometrySharedPtr _geometry);

ignition::math::Pose3d inverseTransformToParentFrame(
ignition::math::Pose3d _transformInLinkFrame,
urdf::Pose _parentToLinkTransform);

/// reduced fixed joints: transform to parent frame
urdf::Pose TransformToParentFrame(urdf::Pose _transformInLinkFrame,
urdf::Pose _parentToLinkTransform);
Expand Down Expand Up @@ -2420,31 +2416,6 @@ ignition::math::Pose3d TransformToParentFrame(
return transformInParentLinkFrame;
}

/////////////////////////////////////////////////
/// reduced fixed joints: transform to parent frame
ignition::math::Pose3d inverseTransformToParentFrame(
ignition::math::Pose3d _transformInLinkFrame,
urdf::Pose _parentToLinkTransform)
{
ignition::math::Pose3d transformInParentLinkFrame;
// rotate link pose to parentLink frame
urdf::Rotation ri = _parentToLinkTransform.rotation.GetInverse();
ignition::math::Quaterniond q1(ri.w, ri.x, ri.y, ri.z);
transformInParentLinkFrame.Pos() = q1 * _transformInLinkFrame.Pos();
urdf::Rotation r2 = _parentToLinkTransform.rotation.GetInverse();
ignition::math::Quaterniond q3(r2.w, r2.x, r2.y, r2.z);
transformInParentLinkFrame.Rot() = q3 * _transformInLinkFrame.Rot();
// translate link to parentLink frame
transformInParentLinkFrame.Pos().X() = transformInParentLinkFrame.Pos().X()
- _parentToLinkTransform.position.x;
transformInParentLinkFrame.Pos().Y() = transformInParentLinkFrame.Pos().Y()
- _parentToLinkTransform.position.y;
transformInParentLinkFrame.Pos().Z() = transformInParentLinkFrame.Pos().Z()
- _parentToLinkTransform.position.z;

return transformInParentLinkFrame;
}

////////////////////////////////////////////////////////////////////////////////
void ReduceSDFExtensionToParent(urdf::LinkSharedPtr _link)
{
Expand Down Expand Up @@ -3467,15 +3438,15 @@ void ReduceSDFExtensionPluginFrameReplace(
TiXmlNode* rpyKey = (*_blobIt)->FirstChild("rpyOffset");
if (rpyKey)
{
urdf::Vector3 rpy = ParseVector3(rpyKey, M_PI/180.0);
urdf::Vector3 rpy = ParseVector3(rpyKey);
_reductionTransform.Rot() =
ignition::math::Quaterniond::EulerToQuaternion(rpy.x, rpy.y, rpy.z);
// remove xyzOffset and rpyOffset
(*_blobIt)->RemoveChild(rpyKey);
}

// pass through the parent transform from fixed joint reduction
_reductionTransform = inverseTransformToParentFrame(_reductionTransform,
_reductionTransform = TransformToParentFrame(_reductionTransform,
_link->parent_joint->parent_to_joint_origin_transform);

// create new offset xml blocks
Expand Down
26 changes: 26 additions & 0 deletions test/integration/fixed_joint_reduction.cc
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Expand Up @@ -48,6 +48,9 @@ const std::string SDF_TEST_FILE_COLLISION_VISUAL_EXTENSION_EMPTY_ROOT =
const std::string SDF_TEST_FILE_COLLISION_VISUAL_EXTENSION_EMPTY_ROOT_SDF =
sdf::filesystem::append(PROJECT_SOURCE_PATH, "test", "integration",
"fixed_joint_reduction_collision_visual_empty_root.sdf");
const std::string SDF_TEST_FILE_PLUGIN_FRAME_EXTENSION =
sdf::filesystem::append(PROJECT_SOURCE_PATH, "test", "integration",
"fixed_joint_reduction_plugin_frame_extension.urdf");

const double gc_tolerance = 1e-6;

Expand Down Expand Up @@ -736,3 +739,26 @@ TEST(SDFParser, FixedJointReductionSimple)
EXPECT_NEAR(iyz, mapIxyIxzIyz[linkName].Z(), gc_tolerance);
}
}

/////////////////////////////////////////////////
// This test uses a urdf that has chained fixed joints with plugin that
// contains bodyName, xyzOffset and rpyOffset.
// Test to make sure the offsets have the correct transfrom and frame of
// reference
TEST(SDFParser, FixedJointReductionPluginFrameExtensionTest)
{
sdf::SDFPtr robot(new sdf::SDF());
sdf::init(robot);
ASSERT_TRUE(sdf::readFile(SDF_TEST_FILE_PLUGIN_FRAME_EXTENSION, robot));

sdf::ElementPtr model = robot->Root()->GetElement("model");
sdf::ElementPtr plugin = model->GetElement("plugin");

auto xyzOffset = plugin->Get<ignition::math::Vector3d>("xyzOffset");
auto rpyOffset = plugin->Get<ignition::math::Vector3d>("rpyOffset");
auto bodyName = plugin->Get<std::string>("bodyName");
EXPECT_EQ("base_link", bodyName);
EXPECT_EQ(ignition::math::Vector3d(-0.707108, 1.70711, 0), xyzOffset);
EXPECT_EQ(ignition::math::Vector3d(0, 0, 1.5708), rpyOffset);
}

103 changes: 103 additions & 0 deletions test/integration/fixed_joint_reduction_plugin_frame_extension.urdf
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Original file line number Diff line number Diff line change
@@ -0,0 +1,103 @@
<?xml version="1.0" encoding="utf-8"?>
<robot name="chained_fixed_joint_links">
<gazebo>
<plugin name='test_plugin' filename='libtest_plugin.so'>
<serviceName>/test/plugin/service</serviceName>
<topicName>/test/plugin/topic</topicName>
<bodyName>link2</bodyName>
<updateRate>100</updateRate>
<xyzOffset>0 0 0</xyzOffset>
<rpyOffset>0 0 0</rpyOffset>
</plugin>
</gazebo>

<!-- Base Link -->
<link name="base_link">
<collision>
<origin rpy="0 0 0" xyz="0 0 0.0"/>
<geometry>
<box size="1.0 1.0 1"/>
</geometry>
</collision>
<visual>
<origin rpy="0 0 0" xyz="0 0 1.0"/>
<geometry>
<box size="0.1 0.1 2"/>
</geometry>
</visual>
<inertial>
<origin xyz="0 0 1" rpy="0 0 0"/>
<mass value="1"/>
<inertia
ixx="1.0" ixy="0.0" ixz="0.0"
iyy="1.0" iyz="0.0"
izz="1.0"/>
</inertial>
</link>

<!-- Link 1 -->
<link name="link1">
<collision>
<origin rpy="0 0 0" xyz="0 0 0.0"/>
<geometry>
<box size="1.0 1.0 1"/>
</geometry>
</collision>
<visual>
<origin rpy="0 0 0" xyz="0 0 0.0"/>
<geometry>
<box size="0.1 0.1 1"/>
</geometry>
</visual>
<inertial>
<origin xyz="0 0 1" rpy="0 0 0"/>
<mass value="1"/>
<inertia
ixx="1.0" ixy="0.0" ixz="0.0"
iyy="1.0" iyz="0.0"
izz="1.0"/>
</inertial>
</link>

<!-- Link 2 -->
<link name="link2">
<collision>
<origin rpy="0 0 0" xyz="0 0 0.0"/>
<geometry>
<box size="1.0 1.0 1"/>
</geometry>
</collision>
<visual>
<origin rpy="0 0 0" xyz="0 0 0.0"/>
<geometry>
<box size="0.1 0.1 1"/>
</geometry>
</visual>
<inertial>
<origin xyz="0 0 1" rpy="0 0 0"/>
<mass value="1"/>
<inertia
ixx="1.0" ixy="0.0" ixz="0.0"
iyy="1.0" iyz="0.0"
izz="1.0"/>
</inertial>
</link>

<!-- Joint 1 -->
<joint name="joint1" type="fixed">
<parent link="base_link"/>
<child link="link1"/>
<origin rpy="0 0 0.7854" xyz="0 1.0 0.0"/>
<dynamics damping="0.7"/>
</joint>

<!-- Joint 2 -->
<joint name="joint2" type="fixed">
<parent link="link1"/>
<child link="link2"/>
<origin rpy="0 0 0.7854" xyz="0 1.0 0.0"/>
<axis xyz="0 1 0"/>
<dynamics damping="0.7"/>
</joint>
</robot>