C# implementation of Ming-Lun "Allen" Chou's springing functions for Unity (aka my favorite functions)

Spring.cs

// Source: http://allenchou.net/2015/04/game-math-precise-control-over-numeric-springing/
public void Spring(ref float x, ref float v, float xt, float zeta, float omega, float h)
{
	float f = 1.0f + 2.0f * h * zeta * omega;
	float oo = omega * omega;
	float hoo = h * oo;
	float hhoo = h * hoo;
	float detInv = 1.0f / (f + hhoo);
	float detX = f * x + h * v + hhoo * xt;
	float detV = v + hoo * (xt - x);
	x = detX * detInv;
	v = detV * detInv;
}

public void Spring(ref Vector2 current, ref Vector2 velocity, Vector2 target, float dampingRatio, float angularFrequency, float timeStep)
{
	float f = 1.0f + 2.0f * timeStep * dampingRatio * angularFrequency;
	float oo = angularFrequency * angularFrequency;
	float hoo = timeStep * oo;
	float hhoo = timeStep * hoo;
	float detInv = 1.0f / (f + hhoo);
	Vector2 detX = f * current + timeStep * velocity + hhoo * target;
	Vector2 detV = velocity + hoo * (target - current);
	current = detX * detInv;
	velocity = detV * detInv;
}