The best way to represent a snake is not SDF but XACRO: http://answers.gazebosim.org/question/16715/how-can-i-represent-a-anake-robot-with-many-identical-segmens-in-sdf/
Q:How can I represent a anake robot with many identical segmens in SDF?
A: SDFs for multipart robots that have a lot of similar elements is very ineficient. Xacros were made for these cases.
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