The Gazebo model of the actuated 3-finger gripper has no colour, i.e. it is plain white.
This was mentioned in #69 but the issue is still present and I cannot reopen it.
The meshes likely need to be imported/exported to DAE in blender with the correct colour. Is there a reference what the colour values are? I tried to make them cmpletely black but then they were missing shading in Gazebo.