its hard to point but I 'm sure there is stuff outthere I'll post my example as rough as it is but there are other ideas too..just have to get them together
another example of material effector is here
http://johnl.inform.net/pages/matteffect.htm
it was done originaly by Jeff Paries in 8.5 I just redid in 10
and is a great example
The materialeffector unfortunately effects everything it touches based on it's shape so this might present a problem
Hoepfully i'm not confusing you more than helping
anyone else have materialeffector info??
fuelmat.zip