Mathf.SmoothStep sequence Time problem

Questions & Answers
1

Help me resolve the issue about SmoothStep
I want to make the ‘radius’ 1st go form 20 to -1, after that from -1 to 5 and after from 5 to 0.

So I tried to make a code with triggers and coroutines, but I don’t get it how to make it work properly
Because I think the time goes the same in every SmoothStep.

IEnumerator BeHole()
	{
		if (check1 == false) 
		{
			radius = Mathf.SmoothStep (20, -1, Time.time / 3);
		} 
		yield return null;
	}
}
2

IEnumerator BeHole( float transitionDuration, params float radiuses )
{
float inverseTransitionDuration = 1f / transitionDuration ;

     radius = radiuses[0];
     yield return null;

     for ( int index = 0 ; index < radiuses.Length - 1 ; ++index )
     {
         for ( float t = Time.deltaTime ; t < transitionDuration ; t = Mathf.Min( t + Time.deltaTime, transitionDuration ) )
         {
             radius = Mathf.SmoothStep (radiuses[index], radiuses[index + 1], t * inverseTransitionDuration );
             yield return null;
         } 
         radius = radiuses[index + 1];
         yield return null;
     }
 }

And you call it as follow ONLY ONCE (not each frame)

// The 1st argument is the time needed to go from 20 to -1
StartCoroutine( BeHole( 1, 20f, -1f, 5f, 0f ) ) ;

// OR
// StartCoroutine( BeHole( 1, new float[]{ 20f, -1f, 5f, 0f } ) ) ;