Blizzard's profile - activity

Hello,

i'm using stl-files to visualize a car model in rviz. Unfortunately since upgrade to ROS indigo the windows are not transparent any more. There seems to be a problem with the alpha channel.

The current color setting for the windows is:

  windows.color.a = 0.25;
  windows.color.r = 0.0;
  windows.color.g = 0.0;
  windows.color.b = 0.0;

Any help or maybe some fix or workaround would be appreciated.

Hello again,

in my Program i use different classes with inheritance. Everything works fine until i end the process (Ctrl C). Then it throws the following error:

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >'
  what():  boost::lock_error

The class structure is organized as follows:

|---------------------------------------------------------|
| AdditionalObject                                        |
|---------------------------------------------------------|



|---------------------------------------------------------|
| BaseObject                                              |
|---------------------------------------------------------|
| boost::shared_ptr<AdditionalObject> m_additional_object |
|---------------------------------------------------------|
                             A
                             |
                             |
|---------------------------------------------------------|
| Object                                                  |
|---------------------------------------------------------|

I created a minimal example that reproduces that error:

#include <ros/ros.h>

// ***************************** class AdditionalObject *****************************
class AdditionalObject
{
public:
  AdditionalObject();

private:
  void timerCallback(const ros::TimerEvent& event);
  ros::NodeHandlePtr m_n;
  ros::Timer  m_timer;
};

AdditionalObject::AdditionalObject()
{
  m_n = boost::shared_ptr<ros::NodeHandle>(new ros::NodeHandle());
  m_timer = m_n->createTimer(ros::Duration(1), &AdditionalObject::timerCallback, this);
}

void AdditionalObject::timerCallback(const ros::TimerEvent &event)
{
  std::cout << "beep" << std::endl;
}

// ******************************* class BaseObject *******************************
class BaseObject
{
public:
  BaseObject(boost::shared_ptr<AdditionalObject> additional_object);

private:
  boost::shared_ptr<AdditionalObject> m_additional_object;
};

BaseObject::BaseObject(boost::shared_ptr<AdditionalObject> additional_object) : m_additional_object(additional_object) { }

// ********************************** class Object **********************************
class Object : public BaseObject
{
public:
  Object(boost::shared_ptr<AdditionalObject> additional_object);
};

Object::Object(boost::shared_ptr<AdditionalObject> additional_object) : BaseObject(additional_object) { }

// **********************************************************************************

// public variables
boost::shared_ptr<Object> object;
boost::shared_ptr<AdditionalObject> additional_object;

int main(int argc, char **argv)
{
  ros::init(argc, argv, "minimal_example");
  ros::NodeHandle n;

  additional_object = boost::shared_ptr<AdditionalObject>(new AdditionalObject());
  object = boost::shared_ptr<Object>(new Object(additional_object));

  ros::spin();
  return 0;
}

I'm using ROS Hydro on Kubuntu 12.04. Any help would be appreciated.

Well, learning never stops. Thank you for your help.

Thank you very much. Now it works like expected. Will these two branches be merged into future versions of rqt and qt_gui_core? I hope so.

Hello,

i have some problems with making the ros::timer work. Usually if i need a timer within a class i add these three lines to the header:

  void timerCallback(const ros::TimerEvent& event);
  ros::Timer m_timer;
  ros::NodeHandle m_nh;

and in the cpp file i add this line for example to the constructor:

m_timer = m_nh.createTimer(ros::Duration(1), &MyClass::timerCallback, this);

Last but not least i add a callback function to the cpp:

void MyClass::timerCallback(const ros::TimerEvent& event)
{
  // something that has to be done frequently
  ROS_INFO("Beep");
}

Unfortunatly it does not work this way in an rqt plugin. For some reason the callback function is never thrown. Please help me with that. I'm using ROS Hydro on Kubuntu 12.04.

This gives me more safety in my decision for a new laptop. Thank you for your detailed answer.

Hello,

for my master thesis i will have to scan a lot of people with a kinect, record the data to bag-files and visualize the rgb-pointcloud with rviz. To do that i'd like to buy a new laptop. My Question is what hardware i will need to do that. I guess an intel i5 processor, 8 GB of RAM and an SSD will be enought. But what about the graphics card? Has it to be a dedicated graphics chip or is an integrated intel hd 4000 ok?

If you have worked on a laptop with a kinect and rviz, please let me know what hardware you are using and how smooth it works.

Thanks in advance, Blizzard

After three frustrating days of trying to make depth registration work i finally found your post. Now it works. Thank you! Thank you! Thank you! (I'm using Kubuntu 12.04.2 lts 64 bit and ROS fuerte)