CornerFX optional effect is primarily is for cars, to trigger smoke and a sound effect from the tires while making sharp turns at higher speeds.
Smoke will be triggered by CornerFX from tires/prims with the burn keyword
CornerFX parameters are assigned at the top of the Root Settings script:
integer CornerFXON = FALSE; float CornerFXSmokeThresh= 0.5; //drift smoke turn strength threshhold. Range 0.1 - 3.5 The higher this is, the stronger turn is required float CornerFXSmokeVel= 15; //The velocity before CornerFX smoke can be triggered. string CornerFXSound = "632706df-a5b8-16a4-c5ab-48c8a1ba14cf";// Custom sound for CornerFX. Set to "" for none float CornerFXVolume= 0.3; //CornerFX sound Volume range 0.0 - 1.0