try this
then check the tCarNZ value, if it's below 0 ie -value then the back of the car collided.
ps it maybe at +value depending on the car orientation in the modelling app.
If CountCollisions(car)>0 nx = CollisionNX#(car) ny = CollisionNY#(car) nz = CollisionNZ#(car) Else nx = 0 ny = 0 nz = 0 EndIf TFormVector nx,ny,nz,0,car tCarmNX = TFormedX() tCarNY = TFormedY() tCarNZ = TFormedZ()
then check the tCarNZ value, if it's below 0 ie -value then the back of the car collided.
ps it maybe at +value depending on the car orientation in the modelling app.