Maps a value onto a cubic S-curve.
@param a The value to map onto a cubic S-curve.
@returns The mapped value.
@a a should range from 0.0 to 1.0.
The derivitive of a cubic S-curve is zero at @a a = 0.0 and @a a = 1.0
See Implementation
Maps a value onto a cubic S-curve.
@param a The value to map onto a cubic S-curve.
@returns The mapped value.
@a a should range from 0.0 to 1.0.
The derivitive of a cubic S-curve is zero at @a a = 0.0 and @a a = 1.0