1個のオブジェクトでも複数回接触判定を返すRaycast

MultiHitRay.cs

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

public class MultiHitRay 
{
	public static List<Vector3> CheckMultiHitRay(Vector3 position, Vector3 direction, float length, LayerMask mask)
	{
		List<Vector3> list = new List<Vector3>();
		
		//   双方向Rayで大雑把な形状を取得
		RaycastHit[] foward = Physics.RaycastAll (position, direction, length, mask);
		RaycastHit[] back = Physics.RaycastAll (position + direction * length, direction * -1, length, mask);
		
		// 外枠のポイント一覧を登録
		foreach (RaycastHit hit in foward) {
			list.Add (hit.point);
		}
		foreach (RaycastHit hit in  back) {
			list.Add (hit.point);
		}
		
		// 内部のコライダーを取得
		foreach (RaycastHit fowardHit in foward) {
			foreach (RaycastHit backHit in  back) {
				if (fowardHit.collider == backHit.collider) {

					float maxDistance = Vector3.Distance (fowardHit.point, backHit.point);
					
					CheckInnerObject(fowardHit.collider, fowardHit.point, direction,  maxDistance, list);
					CheckInnerObject(fowardHit.collider, backHit.point, direction*-1,  maxDistance, list);
				}
			}	
		}
		return list;
	}
	
	public static void CheckInnerObject (Collider hit, Vector3 currentPoint, Vector3 direction, float distance, List<Vector3> list )
	{
		RaycastHit inMeshHit;

		while (hit.Raycast (new Ray (currentPoint + direction * 0.1f, direction), out inMeshHit, distance)) {
			list.Add (inMeshHit.point);
			currentPoint = inMeshHit.point;
			distance -= inMeshHit.distance;
		}
	}
}

Sample.cs

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

[ExecuteInEditMode]
public class Sample : MonoBehaviour
{
  #region UNITY_DELEGATE
	[Range(0.1f, 30f)]
	public float Length = 20;
	public LayerMask Mask;
	private List<Vector3> posList = new List<Vector3> ();
	
	void Update ()
	{
		posList.Clear ();
		posList.AddRange (MultiHitRay.CheckMultiHitRay (transform.position, transform.forward, Length, Mask));
	}
	
	void OnDrawGizmos ()
	{
		if (posList == null) {
			return;
		}
		Gizmos.color = Color.white;
		Gizmos.DrawSphere (transform.position, 0.1f);
		Gizmos.DrawSphere (transform.position + transform.forward * Length, 0.1f);
		Gizmos.DrawLine (transform.position, transform.position + transform.forward * Length);
		Gizmos.color = Color.red;
		foreach (Vector3 pos in posList) {
			Gizmos.DrawSphere (pos, 0.1f);
		}
		Gizmos.color = Color.white;
	}
	#endregion
}