Hi
I just made a Red Bull Air-Race pylon. I use very high visible mat 28, because I don't know any better.
Mat 21 looks nice in low angle light conditions but at noon thi too dark.
Now I am wondering if it's possible to set pylon collide/strenght so it will explode if plane touch it and wont cause any damage to the plane. Only pilot ego get damage.
From
http://www.redbullairrace.com/ About Air Race > Gates
"What’s most important is that these “slalom poles” are made from a very light and fragile spinnaker material which rips immediately when touched by an aircraft wing or a propeller. The pylon then simply collapses and within four minutes it is replaced by a new one."
The ac and texture files you can download from here
http://warezhouse.1g.fi/here/aceshigh/te_stuff/AC3D/RedBullAirRacePylon.zip (4k)