# of nodes!
mass posX posY posZ velX velY velZ
mass posX posY posZ velX velY velZ
mass posX posY posZ velX velY velZ
mass posX posY posZ velX velY velZ
...
..

# of springs
restLen stiffness damping_factor    node1_id (0->#nodes-1)  node2_id(0->#nodes-1)
restLen stiffness damping_factor    node1_id (0->#nodes-1)  node2_id(0->#nodes-1)
restLen stiffness damping_factor    node1_id (0->#nodes-1)  node2_id(0->#nodes-1)
restLen stiffness damping_factor    node1_id (0->#nodes-1)  node2_id(0->#nodes-1)
...
..



Btw, if restLen < 0 -> The reader will calculate the rest length as the current position (i.e. the distance between node 1 and node 2)