Load color OBJ in Gazebo 2.2

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Hi, I'm using Gazebo 2.2 for ROS indigo, I need to load some objects that I've created in obj file forma, so I followed this tutorial where suggest to use a conververt .obj -> .dae collada file format. Then I used this world file:

w1.world :

<?xml version="1.0"?>
<sdf version="1.4">
  <world name="default">
    <include>
      <uri>model://ground_plane</uri>
    </include>
    <include>
      <uri>model://sun</uri>
    </include>
    <model name="my_mesh2">
      <pose>0 0 0  0 0 0</pose>
      <static>true</static>
      <link name="body">
        <visual name="visual">
          <pose> -7 8 0 1.5708 0 0</pose>
          <geometry>
            <mesh>
               <scale>0.01 0.01 0.01</scale>
              <uri>file://mymodel.dae</uri>
            </mesh>
          </geometry>
        </visual>
      </link>
    </model>
  </world>
</sdf>

And launched from terminal with

gazebo w1.world

The mesh is loaded in gazebo, but without color. If I open the .dae file (file is here ) with meshlab the color is displayed, but is not in gazebo. Can somebody help me with this?