OpenRAVE Documentation

Source code for openravepy.examples.movehandstraight

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2009-2011 Rosen Diankov (
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tests moving the end effctor of the manipulator in straight paths.

.. examplepre-block:: movehandstraight


Shows how to use the MoveHandStraight basemanipulation command. The example picks a random trajectory of the end effector and tests if this trajectory is feasible to achieve in the robot.

.. examplepost-block:: movehandstraight
from __future__ import with_statement # for python 2.5
__author__ = 'Rosen Diankov'

import time
from itertools import izip
import openravepy
if not __openravepy_build_doc__:
    from openravepy import *
    from numpy import *

[docs]def main(env,options): "Main example code." env.Load(options.scene) robot = env.GetRobots()[0] if options.manipname is not None: robot.SetActiveManipulator(options.manipname) with env: ikmodel = databases.inversekinematics.InverseKinematicsModel(robot=robot,iktype=IkParameterization.Type.Transform6D) if not ikmodel.load(): ikmodel.autogenerate() basemanip = interfaces.BaseManipulation(robot) taskmanip = interfaces.TaskManipulation(robot) robot.SetJointValues([-0.97],ikmodel.manip.GetGripperIndices()) Tstart = array([[ -1, 0, 0, 2.00000000e-01], [ 0,0, 1, 6.30000000e-01], [ 0, 1 , 0, 5.50000000e-02], [ 0,0,0,1]]) sol = ikmodel.manip.FindIKSolution(Tstart,IkFilterOptions.CheckEnvCollisions) robot.SetDOFValues(sol,ikmodel.manip.GetArmIndices()) #basemanip.MoveToHandPosition([Tstart],maxiter=1000,maxtries=1,seedik=4) #robot.WaitForController(0) if len(ikmodel.manip.GetGripperIndices()) > 0: taskmanip.CloseFingers() robot.WaitForController(0) with env: target = env.GetKinBody('cylinder_green_3') robot.Grab(target) updir = array((0,0,1)) success = basemanip.MoveHandStraight(direction=updir,stepsize=0.01,minsteps=1,maxsteps=40) robot.WaitForController(0) success = basemanip.MoveHandStraight(direction=-updir,stepsize=0.01,minsteps=1,maxsteps=40) robot.WaitForController(0) # test verification with offset (should succeed) T = ikmodel.manip.GetTransform() T[1,3] += 0.1 success = basemanip.MoveHandStraight(direction=updir,starteematrix=T,stepsize=0.01,minsteps=1,maxsteps=20) robot.WaitForController(0) print 'checking for existance of trajectories with random queries of moving in a straight line' armlength = 0 armjoints = [j for j in robot.GetDependencyOrderedJoints() if j.GetJointIndex() in ikmodel.manip.GetArmIndices()] eetrans = ikmodel.manip.GetTransform()[0:3,3] for j in armjoints[::-1]: armlength += sqrt(sum((eetrans-j.GetAnchor())**2)) eetrans = j.GetAnchor() stepsize=0.01 failedattempt = 0 while True: with env: #Tee = dot(ikmodel.manip.GetTransform(),matrixFromAxisAngle(random.rand(3)-0.5,0.2*random.rand())) Tee = matrixFromAxisAngle(random.rand(3)-0.5,pi*random.rand()) direction = random.rand(3)-0.5 direction /= linalg.norm(direction) x = random.rand(3)-0.5 length = 0.6*random.rand()*armlength Tee[0:3,3] = eetrans + x/linalg.norm(x)*(armlength-length) maxsteps=int(length/stepsize)+1 minsteps = maxsteps/2 h = env.drawlinelist(array([Tee[0:3,3],Tee[0:3,3]+direction*maxsteps*stepsize]),1) try: success = basemanip.MoveHandStraight(direction=direction,starteematrix=Tee,stepsize=stepsize,minsteps=minsteps,maxsteps=maxsteps) params = (direction,Tee) print '%d failed attemps before found'%failedattempt,repr(params) failedattempt = 0 h = env.drawlinelist(array([Tee[0:3,3],Tee[0:3,3]+direction*maxsteps*stepsize]),4,[0,0,1]) robot.WaitForController(0) except planning_error,e: failedattempt += 1
from optparse import OptionParser from openravepy.misc import OpenRAVEGlobalArguments @openravepy.with_destroy
[docs]def run(args=None): """Command-line execution of the example. :param args: arguments for script to parse, if not specified will use sys.argv """ parser = OptionParser(description='Shows how choose IK solutions so that move hand straight can move without discontinuities.') OpenRAVEGlobalArguments.addOptions(parser) parser.add_option('--scene', action="store",type='string',dest='scene',default='data/puma_tabletop.env.xml', help='Scene file to load (default=%default)') parser.add_option('--manipname', action="store",type='string',dest='manipname',default=None, help='Choose the manipulator to perform movement for') (options, leftargs) = parser.parse_args(args=args) OpenRAVEGlobalArguments.parseAndCreateThreadedUser(options,main,defaultviewer=True)
if __name__ == "__main__": run()


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