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2016-10-30 19:48:08 -0600 asked a question Simulate lighting on a moving camera

Hello! I would like to know if it is possible in gazebo to simulate a lighting source attached to a 2D-RGB camera, like a LED, to work with some simulated dark working conditions. I tried to attach the point light descriptions to my camera urdf file within "gazebo" tag, but it does not work, and I am also not sure whether such lighting source of gazebo is moveable during simulation. Thanks for any suggestions in advance!

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2013-10-25 09:02:48 -0600 commented question Issues with the physical simulation of gazebo

No one helps with this?

2013-10-23 11:59:23 -0600 asked a question Issues with the physical simulation of gazebo

Hello! I encounter an issue regarding the physical simulation of gazebo, which is that the object in the simulated world keeps rolling over forever and just does not stop. I have uploaded related files (including the model file and world file) to help solve the problem:

https://drive.google.com/folderview?id=0B49go8f2Nr2gZzY4R3VnNGJMNTQ&usp=sharing

Although I set the friction parameters for both the world and the object, the problem still exists. When I use box to approximate the object model, the object shakes forever and does not stop.

I use gazebo 1.9.1 in ubuntu precise 32bit. Thanks for any help!

2013-10-23 05:56:18 -0600 commented answer Error when loading plugins with gazebo2.0

Things are in order again when I have reinstalled ros(hydro) and gazebo(1.9.1).

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2013-10-22 12:42:51 -0600 commented answer Error when loading plugins with gazebo2.0

Thanks! It seems that I have to reinstall everything related to ros and gazebo...

2013-10-22 12:14:26 -0600 commented answer Issues of gazebo 2.0 used with ros-hydro

Thanks for your reply!

2013-10-22 06:53:37 -0600 asked a question Error when loading plugins with gazebo2.0

Hello! I have upgraded both gazebo (now as "gazebo-current" with the version of 2.0.0-2) and ros-hydro-gazebo-ros (now the version is 2.4.0-1precise) packages. My os is ubuntu precise 32bit. When I start the hector_quadrotor simulator, the gazebo can not find the plugins needed by the simulator:

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-ros-sonar.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-ros-imu.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-ros-baro.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-ros-magnetic.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-ros-gps.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin libhector-gazebo-quadrotor-simple-controller.so: libgazebo_physics.so.1: cannot open shared object file: No such file or directory

All these plugins are in this directory of my catkin workspace: /home/xxx/Workspace/catkin_ws/devel/lib, and I have also sourced the setup file of gazebo and exported the environment variables accordingly:

export GAZEBORESOURCEPATH=/home/xxx/Workspace:$GAZEBORESOURCEPATH

export GAZEBOPLUGINPATH=/home/xxx/Workspace/catkin_ws/devel/lib:$GAZEBOPLUGIN_PATH

Thanks for any help!

2013-10-17 15:49:46 -0600 asked a question How to measure the size of the model in gazebo

Hi! I would like to ask how to measure the size of a certain object (for example, the length of a wall) in gazebo. Or do I have to do this with some other 3D modeling softwares (e.g. Blender) using the mesh file of the object? Thanks for any help! I use gazebo 1.9.1.

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2013-10-10 02:30:57 -0600 commented question Issues of gazebo 2.0 used with ros-hydro

Thanks for your reply! That question(88826) has been unfortunately closed by the manager of the ros forum, probably as it is a gazebo topic. I install both gazebo and ros-hydro-gazebo-pkgs from debs.

2013-10-09 03:46:06 -0600 asked a question Issues of gazebo 2.0 used with ros-hydro

Hi, I have just upgraded to gazebo 2.0, I use ros-hydro and ubuntu 12.04 32bit. It seems that the new gazebo is not compatible with ros, as when I start the gazebo with ros: roslaunch gazeboros emptyworld.launch, I get the following error messages:

Error [Plugin.hh:141] Failed to load plugin /opt/ros/hydro/lib/libgazeborospathsplugin.so: libgazebocommon.so.1: cannot open shared object file: No such file or directory

Error [Plugin.hh:141] Failed to load plugin /opt/ros/hydro/lib/libgazeborosapiplugin.so: libgazebocommon.so.1: cannot open shared object file: No such file or directory

Then there is no service provided by gazebo to spawn model using urdf, which is waited by the ros-gazebo interface programm spawn_model. Someone else also encounters the same problem: http://answers.ros.org/question/88826/plorblem-in-loading-gazebo-in-ros/

Thanks for any help!

2013-09-26 15:01:17 -0600 commented answer Strange behavior of JointVelocityController in rrbot tutorial

Thanks! You are quite right! It works fine again when I set a small pid value.

2013-09-26 15:00:22 -0600 commented answer Strange behavior of JointVelocityController in rrbot tutorial

Thanks for the suggestion!

2013-09-26 06:34:10 -0600 asked a question Strange behavior of JointVelocityController in rrbot tutorial

Hi, the original rrbot module works fine as indicated in the tutorial. But the problem comes when I just change the joint controller of one joint (here, the joint1) from the position controller to the velocity controller (in the rrbot_control.yaml file and also in the controller launch file) and do not touch any other things, and then loads the controller:

joint1velocitycontroller: type: effort_controllers/JointVelocityController joint: joint1 pid: {p: 100.0, i: 0.01, d: 10.0}

The program either crashes:

Physics dynamic reconfigure ready. gzclient: /build/buildd/ogre-1.7.4/OgreMain/include/OgreAxisAlignedBox.h:252: void Ogre::AxisAlignedBox::setExtents(const Ogre::Vector3&, const Ogre::Vector3&): Assertion `(min.x <= max.x && min.y <= max.y && min.z <= max.z) && "The minimum corner of the box must be less than or equal to maximum corner"' failed.

or the whole robot looks strange as all the links are combined together (see capture here: https://docs.google.com/file/d/0B49go8f2Nr2gTTJzdl80ckxoOFk/edit?usp=sharing), and it does not rotate anymore. Thanks for any help!

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2013-07-26 04:07:00 -0600 commented answer contact sensor no data output

Considering the complete SDF model, please see here: https://docs.google.com/file/d/0B49go8f2Nr2gSllrdTdBNzRDU00/edit?usp=sharing Thanks once again!

2013-07-26 04:01:32 -0600 commented answer contact sensor no data output

By the way, the capture got from the screenshot of gzclient gui is black and white, not colorful, maybe I do not use it rightly? See here: https://picasaweb.google.com/lh/photo/tjzwl2O1S3Loz-e7yDChR8lmXIO0_bfruZ6HTfNkO2E?feat=directlink