You need to use a quadratic formula to work out the change in height against time (ie make a parabola).
for example, h = -t^2
where h is the height, and t is the time.
You could use it like:
Function _fall(carx#,cary#,carz#)
If Object Position Y(car) > Get Ground Height 1,carx#,carz#
oldcary# = cary#
inc t#,0.1
rem this line below works out the value of the parabolic curve
rem to get a steeper decent, put a number before t#, eg, make the equation height# = -2 * t#^2
rem to get a shalower decent, put a fraction before t#, eg, make the equation height# = -0.5 * t#^2
height# = -t#^2
cary# = oldcary# + height#
Position Object car,carx#,cary#,carz#
EndIf
EndFunction
Also, if you want the car to tilt when in the air, use this (it's just a modification of the above function):
Function _fall(carx#,cary#,carz#)
If Object Position Y(car) > Get Ground Height 1,carx#,carz#
car_ax# = Object Angle X(car)
oldcary# = cary#
inc t#,0.1
rem this line below works out the value of the parabolic curve
rem to get a steeper decent, put a number before t#, eg, make the equation height# = -2 * t#^2
rem to get a shalower decent, put a fraction before t#, eg, make the equation height# = -0.5 * t#^2
height# = -t#^2
car_ax# = car_ax# + height#
cary# = oldcary# + height#
Position Object car,carx#,cary#,carz#
XRotate Object car,car_ax#
EndIf
EndFunction
Hope I Helped...
Team EOD :: Programmer/Logical Engineer/All-Round Nice Guy