The Plugin converts the dump local files to a ParaView readable format.
In the inputscript use a compute like this

compute 	fc     		all pair/gran/local id pos force

and a dump command like this

dump 		forcechain 	all local ${dump} post/fc*.dump  c_fc[1] c_fc[2] c_fc[3] c_fc[4] c_fc[5] c_fc[6] c_fc[7] c_fc[8] c_fc[9] c_fc[10] c_fc[11] c_fc[12] #x1 y1 z1 x2 y2 z2 id1 id2 periodic fx fy fz

to generate the dump files.

The Plugin outputs a VTKPolyData Object which contains the Points and a line connecting each contact-pair for visualisation.