BoundStats.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BoundStats : MonoBehaviour {

    public float log_interval = 15;
    public float desired_size = 10; 
    private float[] minP; 
    private float[] maxP;

    private float last_log;

    // Use this for initialization
    void Start () {
        Reset();
        last_log = Time.time;
    }
    
    private void Reset () {
        minP = new float[]{ float.MaxValue, float.MaxValue, float.MaxValue};
        maxP = new float[]{ float.MinValue, float.MinValue, float.MinValue};
        last_log = Time.time;
    }

    // Update is called once per frame
    void Update () {
        Vector3 p = transform.position;
        minP[0] = Mathf.Min( minP[0], p.x);
        minP[1] = Mathf.Min( minP[1], p.y);
        minP[2] = Mathf.Min( minP[2], p.z);
        maxP[0] = Mathf.Max( maxP[0], p.x);
        maxP[1] = Mathf.Max( maxP[1], p.y);
        maxP[2] = Mathf.Max( maxP[2], p.z);

        if ((Time.time - last_log) > log_interval) {
            last_log = Time.time;
            Debug.Log(string.Format(" x=({0:000.0},{1:000.0}) y=({2:000.0},{3:000.0}) z=({4:000.0},{5:000.0})", 
                    minP[0], maxP[0],
                    minP[1], maxP[1],
                    minP[2], maxP[2]
                    ));
            // Determine the offset and global scale for a canonical form
            float midX = (maxP[0] + minP[0])/2f;
            float midY = (maxP[1] + minP[1])/2f;
            float midZ = (maxP[2] + minP[2])/2f;
            float maxExtent = Mathf.Max((maxP[0] - minP[0]), (maxP[1] - minP[1]));
            maxExtent = Mathf.Max(maxExtent, (maxP[2] - minP[2]));
            // desired_Scale = maxEtent * scale, so
            float scale = desired_size/maxExtent;
            Debug.Log(string.Format("offset/scale = Vector3({0:00.0}f,{1:00.0}f,{2:00.0}f), {3:0.00}f", 
                    -midX, -midY, -midZ, scale
                    ));
            // this allows early initial position to get discarded. 
            Reset();
        }

    }
}