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examples: add orientation path constraint
constrained.py: constrain orientation of attached object pickplace.py: keep object upright during transport
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@ -38,21 +38,35 @@ co.operation = co.ADD
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mps = stages.ModifyPlanningScene("modify planning scene")
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mps.addObject(co)
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co.id = "object"
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co.primitives[0].type = SolidPrimitive.BOX
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co.primitives[0].dimensions = [0.1, 0.05, 0.03]
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pose = co.primitive_poses[0]
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pose.position.x = 0.30702
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pose.position.y = 0.0
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pose.position.z = 0.485
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pose.orientation.x = pose.orientation.w = 0.70711 # 90° about x
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mps.addObject(co)
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mps.attachObjects(["object"], "panda_hand")
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task.add(mps)
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move = stages.MoveRelative("y +0.4", planner)
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move.timeout = 5
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move.group = group
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header = Header(frame_id="world")
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move.setDirection(Vector3Stamped(header=header, vector=Vector3(0, 0.4, 0)))
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constraints = Constraints()
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oc = OrientationConstraint()
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oc.parameterization = oc.ROTATION_VECTOR
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oc.header.frame_id = "world"
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oc.link_name = "panda_hand"
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oc.orientation.x = 1.0
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oc.absolute_x_axis_tolerance = 0.01
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oc.absolute_y_axis_tolerance = 0.01
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oc.absolute_z_axis_tolerance = 0.01
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oc.link_name = "object"
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oc.orientation.x = oc.orientation.w = 0.70711 # 90° about x
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oc.absolute_x_axis_tolerance = 0.1
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oc.absolute_y_axis_tolerance = 0.1
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oc.absolute_z_axis_tolerance = 3.14
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oc.weight = 1.0
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constraints.orientation_constraints.append(oc)
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move.path_constraints = constraints
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@ -5,7 +5,8 @@ from py_binding_tools import roscpp_init
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from moveit.task_constructor import core, stages
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from moveit_commander import PlanningSceneInterface
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from geometry_msgs.msg import PoseStamped, TwistStamped
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import time
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from moveit_msgs.msg import Constraints, OrientationConstraint
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import math, time
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roscpp_init("mtc_tutorial")
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@ -17,7 +18,7 @@ eef = "hand"
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# [pickAndPlaceTut2]
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# Specify object parameters
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object_name = "grasp_object"
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object_name = "object"
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object_radius = 0.02
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# Start with a clear planning scene
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@ -28,7 +29,7 @@ psi.remove_world_object()
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# Grasp object properties
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objectPose = PoseStamped()
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objectPose.header.frame_id = "world"
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objectPose.pose.orientation.x = 1.0
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objectPose.pose.orientation.w = 1.0
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objectPose.pose.position.x = 0.30702
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objectPose.pose.position.y = 0.0
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objectPose.pose.position.z = 0.285
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@ -56,7 +57,7 @@ pipeline.planner = "RRTConnectkConfigDefault"
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planners = [(arm, pipeline)]
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# Connect the two stages
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task.add(stages.Connect("connect1", planners))
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task.add(stages.Connect("connect", planners))
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# [initAndConfigConnect]
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# [pickAndPlaceTut4]
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@ -64,7 +65,7 @@ task.add(stages.Connect("connect1", planners))
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# [initAndConfigGenerateGraspPose]
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# The grasp generator spawns a set of possible grasp poses around the object
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grasp_generator = stages.GenerateGraspPose("Generate Grasp Pose")
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grasp_generator.angle_delta = 0.2
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grasp_generator.angle_delta = math.pi / 2
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grasp_generator.pregrasp = "open"
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grasp_generator.grasp = "close"
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grasp_generator.setMonitoredStage(task["current"]) # Generate solutions for all initial states
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@ -78,7 +79,8 @@ simpleGrasp = stages.SimpleGrasp(grasp_generator, "Grasp")
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# Set frame for IK calculation in the center between the fingers
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ik_frame = PoseStamped()
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ik_frame.header.frame_id = "panda_hand"
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ik_frame.pose.position.z = 0.1034
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ik_frame.pose.position.z = 0.1034 # tcp between fingers
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ik_frame.pose.orientation.x = 1.0 # grasp from top
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simpleGrasp.setIKFrame(ik_frame)
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# [initAndConfigSimpleGrasp]
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# [pickAndPlaceTut6]
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@ -109,16 +111,35 @@ task.add(pick)
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# [initAndConfigPick]
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# [pickAndPlaceTut8]
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# Define orientation constraint to keep the object upright
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oc = OrientationConstraint()
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oc.parameterization = oc.ROTATION_VECTOR
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oc.header.frame_id = "world"
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oc.link_name = "object"
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oc.orientation.w = 1
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oc.absolute_x_axis_tolerance = 0.1
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oc.absolute_y_axis_tolerance = 0.1
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oc.absolute_z_axis_tolerance = math.pi
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oc.weight = 1.0
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constraints = Constraints()
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constraints.name = "object:upright"
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constraints.orientation_constraints.append(oc)
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# [pickAndPlaceTut9]
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# Connect the Pick stage with the following Place stage
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task.add(stages.Connect("connect2", planners))
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con = stages.Connect("connect", planners)
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con.path_constraints = constraints
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task.add(con)
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# [pickAndPlaceTut9]
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# [pickAndPlaceTut10]
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# [initAndConfigGeneratePlacePose]
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# Define the pose that the object should have after placing
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placePose = objectPose
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placePose.pose.position.y += 0.2 # shift object by 20cm along y axis
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placePose.pose.position.x = -0.2
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placePose.pose.position.y = -0.6
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placePose.pose.position.z = 0.0
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# Generate Cartesian place poses for the object
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place_generator = stages.GeneratePlacePose("Generate Place Pose")
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