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Here's everything I did:

Not sure how to check gazebo version, but

simulator_gazebo/gazebo/Makefile.gazebo.tarball

has

FILENAME = gazebo-r88428637a5be.tgz

the urdf as I modified it:

<?xml version="1.0"?>
<robot xmlns:xacro="http://ros.org/wiki/xacro" name="test">
    <!--xacro:property name="robot_weight" value="90.0"/-->

    <link name="base_link">
        <inertial>
            <mass value="90"/>
            <inertia ixx="1.000" ixy="0.000"  ixz="0.000"
                                 iyy="28.500" iyz="0.000"
                                              izz="34.800"/>
        </inertial>
        <collision>
            <geometry>
                <box size="0.83 0.60 0.25"/>
            </geometry>
        </collision>
        <visual>
            <geometry>
                <box size="0.83 0.60 0.25"/>
            </geometry>
        </visual>
    </link>
</robot>

from the folder with the urdf file:

$ roslaunch gazebo_worlds empty_world.launch
(new window)
$ rosrun gazebo spawn_model -file mkoval.urdf -urdf -model test

For the SolidWorks file, make sure you have a coordinate system placed where you want it to be in Rviz/Gazebo. When you go to export, there should be an option to select a coordinate system. Make sure you select the right one. An easy way to check it to reimport the *.stl and see where SolidWorks shows the CS.