These easing functions can be used to modify the ageing of the particles in a particle system.

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	Class	Description
	Back	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Bounce	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Circular	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Cubic	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Elastic	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Exponential	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Linear	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Quadratic	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Quartic	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Quintic	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	Sine	A modified form of Robert Penner's easing equations, optimised for the specific use of calculating the energy over a particle's lifetime.
	TwoWay	A set of easing equations for modifying the particle energy such that it starts and ends at zero and peaks at one half way through the particle's lifetime.