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Without arguments it returns 1 if there is mesh, followed by a list with all types of element used in the mesh.
?-pre | -post? -step_index <step_index> | -step_value <step_value>? ?-set_name <set_name>?:
-pre | -post: To specify to use the preproces or postprocess mesh (default -pre).
-step_index <step_index> | -step_value <step_value>:In post can specify time step if the mesh changes along the time (by default the current time step is assumed)
Must set only -step_index <step_index> or alternativelly -step_value <step_value>, but not both.
The the <step_index> is an integer starting from 0 (a special value all is valid and mean 'all steps' for some options)
the <step_value> is a double value representing the value of the time step.
-set_name <set_name>: for Elements of post is optional specify -set_name <set_name> to get only the elements of this set, in case that more than one.
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