This function converts animation time to the virtual animation time. Those values does not need to be identical.
            
    Namespace: 
   SGP.XSpaceAssembly: SGPRTL (in SGPRTL.dll)
Version: 1.2.3019.18825
Syntax
Parameters
- x
 - Type: System..::.Double
Animation run time. 
Return Value
Returns animation virtual run time.
Remarks
We can easily achieve the effect of non-linear animation timing to slow down or speed up parts of the animation.