TrackObjects.cs

using UnityEngine;

[ExecuteAlways]
public class TrackObjects : MonoBehaviour
{
    public Transform target1;
    [Range(0f, 1f)] public float target1Weight;

    public Transform target2;
    [Range(0f, 1f)] public float target2Weight;

    public Transform target3;
    [Range(0f, 1f)] public float target3Weight;

    public void LateUpdate()
    {
        Recompute();
    }

    bool Recompute()
    {
        if (target1 == null) target1Weight = 0;
        if (target2 == null) target2Weight = 0;
        if (target3 == null) target3Weight = 0;

        int count = 0;
        if (target1Weight > 0f) count++;
        if (target2Weight > 0f) count++;
        if (target3Weight > 0f) count++;

        if (count == 0)
        {
            return false;
        }

        // Work out the target point based on the relative weights for the targets.
        float totalWeight = target1Weight + target2Weight + target3Weight;
        Vector3 averagePosition = Vector3.zero;

        // based on [URL='https://forum.unity.com/members/lordofduct.66428/']lordofduct[/URL] response
        Quaternion averageRotation = Quaternion.identity;

        if (target1 != null && target1Weight > 0f)
        {
            averagePosition += target1.position * (target1Weight / totalWeight);
            averageRotation *= Quaternion.Slerp(Quaternion.identity, target1.rotation, target1Weight / totalWeight);
        }
        if (target2 != null && target2Weight > 0f)
        {
            averagePosition += target2.position * (target2Weight / totalWeight);
            averageRotation *= Quaternion.Slerp(Quaternion.identity, target2.rotation, target2Weight / totalWeight);
        }
        if (target3 != null && target3Weight > 0f)
        {
            averagePosition += target3.position * (target3Weight / totalWeight);
            averageRotation *= Quaternion.Slerp(Quaternion.identity, target3.rotation, target3Weight / totalWeight);
        }

        this.transform.position = averagePosition;
        this.transform.rotation = averageRotation;

        return true;
    }
}