TreeLerpSize.cs

// CODE SNIPPET, NOT THE FULL FILE //

//Coroutine that controls growth / death animation, colliders, presence and perch targets
IEnumerator TreeLerpSize (float time, bool death)
{
    ////////////// before main loop
    float startSize, endSize;
    float elapsedTime = 0;
    if (death)
    {
        startSize = 1;
        endSize = 0;
    } else
    {
        growing = true;
        startSize = 0;
        endSize = 1;

        //Activate collider
        treeCollider.enabled = true;
    }

    ////////////// Main loop: Handle growth / shrinking
    while (elapsedTime < time)
    {
        //Transition between start and end size (0 to  1)
        float curSize = Mathf.SmoothStep(startSize, endSize, (elapsedTime / time));
        //Rotations work different. It's best to define the rate of rotation, the sine function is handy for this (between 0, 1, back to 0)
        float curRotationRate = Mathf.Sin(Util.mapVal((elapsedTime / time), 0, 1, 0, Mathf.PI));

        //Apply size & rotation
        treeTransform.localScale = new Vector3(curSize, curSize, curSize);
        treeTransform.RotateAround(treeTransform.position, Vector3.up, curRotationRate * turnDirection);

        elapsedTime += Time.deltaTime;
        yield return new WaitForEndOfFrame();
    }

    ////////////// after main loop
    if (death)
    {
        Destroy(gameObject);
    } else
    {
        //Activate perch targets once growth complete
        Util.FindInactiveChild(gameObject, "perchParent").SetActive(true);
        growing = false;
        if (dead)
        {
            StartDeath();
        } 
    }
}