Interpolating a dynamic value

Unity Engine
,
1

Hello! I’m having a problem with interpolating a value that constantly changes - pelvis rotation on x axis for procedural animation. When the character goes up I want them to bend forward and when descending they should bend backward a little. The character now knows when going up or down and somehow choppily bends but I just CAN’T make the movement smooth! I’m no programmer and it’s probably something absolutely stupid. I’ll be super grateful for any help :frowning:

Here’s the code (clean, without all the interpolation stuff I tried)

private void Start()
    {
        anim = GetComponent<Animator>();
        InvokeRepeating("PrevPos", 0, 0.2f);
    }

called from OnAnimatorIK:

        newPelvisRotation = anim.bodyRotation.eulerAngles + whyunotwork;
        anim.bodyRotation = Quaternion.Euler(newPelvisRotation); //<MAKE THIS SMOOTH
    }

    void PrevPos()
    {
        previousPositionY = transform.position.y;
        Invoke("CheckPos", 0.2f);
    }
    void CheckPos()
    {
        RaycastHit hitRay;
        Physics.Raycast(transform.position, Vector3.down, out hitRay, 2f);
        groundSlopeAngle = Vector3.Angle(hitRay.normal, Vector3.up);
        if (transform.position.y < previousPositionY)
        {
            groundSlopeAngle = -groundSlopeAngle;
        }
        whyunotwork = Vector3.right * groundSlopeAngle;
    }
2

You can rotate a Quaternion to a target over time with RotateTowards: Unity - Scripting API: Quaternion.RotateTowards

3

When interpolating dynamic value, constantly increate weight over time. Imagine we have a sequnce of X positions recorded as animation keyframes with .5 second step:

0 1 -1 2 -2 1 -1 0

This sequnce will move object around 0 with increasing amplitude , then the aplitude wil decrease and object will stop back at 0. Now imagine we want to interpolate it’s position to 1 during that animation.

For that we do:

private void LateUpdate() {
  x = Mathf.Lerp(x, 1, timeSinceStart / duration);
}

With this, object will start waving around 0 and stop at 1 smoothly and preserving original animated move.

4

Thank you for your reply! Yes, I’ve tried that but that was one of the things that didn’t work. I’m probably using it the wrong way otl

5

Thank you so much, I’ll try this!