contact_tolerance.cpp

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/* Author: John Hsu */

#include <string>
#include <gtest/gtest.h>
#include "gazebo/SpawnModel.h"
#include "geometry_msgs/Pose.h"
#include "geometry_msgs/Quaternion.h"
#include "std_srvs/Empty.h"
#include "gazebo/GetModelState.h"

#include <sstream>
#include <tinyxml.h>

// Including ros, just to be able to call ros::init(), to remove unwanted
// args from command-line.
#include <ros/ros.h>

int g_argc;
char** g_argv;

TEST(SpawnTest, checkBoxStackDrift)
{
  ros::NodeHandle nh("");
  // make the service call to spawn model
  ros::service::waitForService("gazebo/spawn_urdf_model");
  ros::ServiceClient spawn_model_client = nh.serviceClient<gazebo::SpawnModel>("gazebo/spawn_urdf_model");
  gazebo::SpawnModel spawn_model;

  // load urdf file
  std::string urdf_filename = std::string(g_argv[1]);
  ROS_DEBUG("loading file: %s",urdf_filename.c_str());
  // read urdf / gazebo model xml from file
  TiXmlDocument xml_in(urdf_filename);
  xml_in.LoadFile();
  std::ostringstream stream;
  stream << xml_in;
  spawn_model.request.model_xml = stream.str(); // load xml file
  ROS_DEBUG("XML string: %s",stream.str().c_str());

  spawn_model.request.robot_namespace = "";
  spawn_model.request.reference_frame = "";

  // spawn 10 boxes
  for (int i=0;i<10;i++)
  {
    std::ostringstream mn_stream;
    mn_stream << "box_" << i;
    spawn_model.request.model_name = mn_stream.str();
    geometry_msgs::Pose pose;
    pose.position.x = pose.position.y = 0; pose.position.z = 1 + 2.0*(i);
    pose.orientation.w = 1.0; pose.orientation.x = pose.orientation.y = pose.orientation.z = 0;
    spawn_model.request.initial_pose = pose;
    ASSERT_TRUE(spawn_model_client.call(spawn_model));
  }

  // get pose of top box, check for drift
  // setup the service call to get model state
  ros::service::waitForService("gazebo/get_model_state");
  ros::ServiceClient get_model_state_client = nh.serviceClient<gazebo::GetModelState>("gazebo/get_model_state");
  gazebo::GetModelState model_state;
  model_state.request.model_name = "box_9";
  double test_duration = 10.0; // check drift over this period of sim time
  double LINEAR_DRIFT_TOLERANCE = 0.0105; // linear drift tolerance of top block
                                          // given contact layer is 1mm, 10 blocks leads to 10*1mm and .5mm of numerical error
  ros::Time timeout = ros::Time::now() + ros::Duration(test_duration);
  // get intial pose
  ASSERT_TRUE(get_model_state_client.call(model_state));
  geometry_msgs::Pose initial_pose = model_state.response.pose;
  while (ros::Time::now() < timeout)
  {
    ASSERT_TRUE(get_model_state_client.call(model_state));
    geometry_msgs::Pose current_pose = model_state.response.pose;
    double error_x = fabs(current_pose.position.x - initial_pose.position.x);
    double error_y = fabs(current_pose.position.y - initial_pose.position.y);
    double error_z = fabs(current_pose.position.z - initial_pose.position.z);
    double error_linear = sqrt(error_x*error_x+error_y*error_y+error_z*error_z);
    ROS_INFO("error: %f",error_linear);
    if (error_linear > LINEAR_DRIFT_TOLERANCE);
      ROS_INFO("box stack teset failed with this linear error (%f):  this means the top box in the box stack is moving too much.  Check to see if surface contact layer has changed from 1mm, bounce parameter has changed, world time step, solver has changed.  You can reproduce this test by:\n\nroslaunch gazebo_tests empty.launch\nrosrun gazebo_tests contact_tolerance `rospack find gazebo_tests`/test/urdf/box.urdf\n",error_linear);
    ASSERT_TRUE(error_linear <= LINEAR_DRIFT_TOLERANCE);

    // FIXME: do something about orientation drift too
    geometry_msgs::Quaternion current_q = current_pose.orientation;
    geometry_msgs::Quaternion initial_q = initial_pose.orientation;
  }


  SUCCEED();
}




int main(int argc, char** argv)
{
  ros::init(argc, argv, "test", ros::init_options::AnonymousName);
  testing::InitGoogleTest(&argc, argv);
  g_argc = argc;
  g_argv = argv;
  return RUN_ALL_TESTS();
}