[ns] multicast traffic for ad hoc routing

Hi , I want to test  a geocast routing that i  write for vanet in ns2 but I don't know how I can write multicast traffic for it in tcl file? I want that one  node send massage and according to place that sender puts , the place of destination region is specified . and I don't know how to write

[ns] multicast traffic for ad hoc routing

Hi , I want to test  a geocast routing that i  write for vanet in ns2 but I don't know how I can write multicast traffic for it in tcl file? I want that one  node send massage and according to place that sender puts , the place of destination region is specified . and I don't know how to write