From http://www.racedepartment.com/bobs-track-builder/29248-sandtraps.html Good info there^^^^ I was just messing around with TDFs and seeing that there isn't a whole lot of info on the TDF file. Sure there are comments in the file but those are hardly comprehensive. I figure we might as well put it all in one place. Here's what I found out: ASDEnvelope=(2.0,0.2,3.5) //(Attack,Sustain,Decay) I assume the other variables (Scale, Growth) are defined in the same format. Does anyone have information on the shader bits in the tdf. I need to get a shiny/reflective skidmarks and groove.