A beam that can be reflected multiple times

ReflectiveBeam.cs

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

public class ReflectiveBeam : MonoBehaviour
{
	[SerializeField] protected LineRenderer m_LineRenderer;
	[SerializeField] protected float m_MaximumDistance = 10.0f;
	[SerializeField] protected int m_NumBounces = 10;
	
	protected void Update()
	{
		var vertices = CalculateBeam();
		m_LineRenderer.SetVertexCount(vertices.Count);
		for(int i = 0; i < vertices.Count; ++i)
			m_LineRenderer.SetPosition(i, vertices[i]);
	}
	
	protected List<Vector3> CalculateBeam()
	{
		var vertices = new List<Vector3>();
		
		Vector3 position = transform.position;
		Vector3 direction = transform.forward;
		vertices.Add(position);
		
		int numBounces = m_NumBounces;
		float remainingDistance = m_MaximumDistance;
		RaycastHit hit;
		while(--numBounces > 0 && remainingDistance > 0.0f && Physics.Raycast(position, direction, out hit, remainingDistance))
		{
			remainingDistance -= (hit.point - position).magnitude;

			vertices.Add(hit.point - direction * 0.1f);
			position = hit.point;
			direction = Vector3.Reflect(direction, hit.normal);
			vertices.Add(hit.point + direction * 0.1f);
		}
		
		if(numBounces > 0)
			vertices.Add(position + direction.normalized * remainingDistance);
		
		return vertices;
	}
}