Gazebo Visualization Marker Example

This example demonstrates how to create, modify, and delete visualization
markers in Gazebo.

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Build Instructions
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 * From this directory:

  $ mkdir build
  $ cd build
  $ cmake ..
  $ make


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Execute Instructions
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 * Launch gazebo as usual then from the build directory above:

  $ ./marker

 * The terminal will output messages indicating visualization changes that
   will occur in Gazebo's render window.