[Tinyos-help] help with simulations

[Munaretto, Daniel]

Hi all,
       i'm upset about Tossim simulations. I have to use "-rf=lossy" option by bash to modify the radius and distance factor directly on TinyViz interface. 
But, at the same time, you lose packets on collisions cause of this lossy option, so the obtained results aren't right (for example the packet delivery ratio).It's bad for simulating flooding networks where you want to create chains or other topologies where nodes aren't in the same range of all network nodes.
(by default TinyViz considers all nodes in the range of each node)
What could i do to have different topologies but without losing packets?
 
Please if anyone knows, send me a suggestion, it's really important!
 
Cheers
Daniele