Scale Child Colliders

using UnityEngine;
using UnityEngine.Splines;

namespace sc.modeling.splines.runtime.auxiliary
{
    [ExecuteAlways]
    public class ScaleChildColliders : MonoBehaviour
    {
        public SplineMesher splineMesher;
        public int splineIndex = 0;

        public Vector3 baseScale = Vector3.one;

        private void Reset()
        {
            splineMesher = GetComponent<SplineMesher>();
        }

        private void OnEnable()
        {
            //Subscribe
            SplineMesher.onPostRebuildMesh += OnPostRebuild;
        }

        private void OnPostRebuild(SplineMesher instance)
        {
            //Is the instance being rebuild the one we want to work with
            if (instance == splineMesher)
            {
                UnityEngine.Splines.Interpolators.LerpFloat3 float3Interpolator = new UnityEngine.Splines.Interpolators.LerpFloat3();
                BoxCollider[] colliders = gameObject.GetComponentsInChildren<BoxCollider>();

                foreach (BoxCollider box in colliders)
                {
                    //Position of box collider in spline's local-space
                    Vector3 samplePos = splineMesher.splineContainer.transform.InverseTransformPoint(box.transform.position + box.center);
                    //Find the position on the spline that's nearest to the box's center
                    SplineUtility.GetNearestPoint(splineMesher.splineContainer.Splines[splineIndex], samplePos, out var nearestPoint, out float t, SplineUtility.PickResolutionMin, 2);

                    //Convert the normalized t-index to the distances on the spline
                    t = splineMesher.splineContainer.Splines[splineIndex].ConvertIndexUnit(t, PathIndexUnit.Normalized, PathIndexUnit.Distance);

                    //Sample the scale data on the spline at the calculated distance
                    Vector3 outputScale = splineMesher.scaleData[splineIndex].Evaluate(splineMesher.splineContainer.Splines[splineIndex], t, splineMesher.scaleData[splineIndex].PathIndexUnit, float3Interpolator);

                    //Apply scale
                    box.transform.localScale = Vector3.Scale(baseScale, outputScale);
                }
            }
        }

        private void OnDisable()
        {
            //Unsubscribe
            SplineMesher.onPostRebuildMesh -= OnPostRebuild;
        }
    }
}