Add laser that stops at walls

Project/Assets/ML-Agents/Examples/FoodCollector/Scripts/BattleFoodAgent.cs

     public Material badMaterial;
     public Material goodMaterial;
     public Material frozenMaterial;
-    public GameObject myLaser;
+    Laser m_Laser;
     public bool contribute;
     public bool useVectorObs;
     [Tooltip("Use only the frozen flag in vector observations. If \"Use Vector Obs\" " +
             agent = this,
         };
         areaScoring.playerStates.Add(playerState);
+        m_Laser = GetComponentInChildren<Laser>();
+        m_Laser.maxLength = m_LaserLength * 25f;
     }
 
     public override void CollectObservations(VectorSensor sensor)
         if (m_Shoot)
         {
             var myTransform = transform;
-            myLaser.transform.localScale = new Vector3(1f, 1f, m_LaserLength);
+            //m_Laser.transform.localScale = new Vector3(1f, 1f, m_LaserLength);
+            m_Laser.isFired = true;
             var rayDir = 25.0f * myTransform.forward;
             Debug.DrawRay(myTransform.position, rayDir, Color.red, 0f, true);
             RaycastHit hit;
         }
         else
         {
-            myLaser.transform.localScale = new Vector3(0f, 0f, 0f);
+            // m_Laser.transform.localScale = new Vector3(0f, 0f, 0f);
+            m_Laser.isFired = false;
         }
     }
 
         Unsatiate();
         m_Shoot = false;
         m_AgentRb.velocity = Vector3.zero;
-        myLaser.transform.localScale = new Vector3(0f, 0f, 0f);
+        m_Laser.isFired = false;
+        //m_Laser.transform.localScale = new Vector3(0f, 0f, 0f);
         transform.position = new Vector3(Random.Range(-m_MyArea.range, m_MyArea.range),
             2f, Random.Range(-m_MyArea.range, m_MyArea.range))
             + area.transform.position;

Project/Assets/ML-Agents/Examples/FoodCollector/Materials/laser.mat

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Project/Assets/ML-Agents/Examples/FoodCollector/Scripts/Laser.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Laser : MonoBehaviour
+{
+    public bool isFired;
+    public float maxLength = 25f;
+    public float width = 0.5f;
+    public bool animate = false;
+    LineRenderer laserRenderer;
+    // Start is called before the first frame update
+    void Start()
+    {
+        laserRenderer = GetComponentInChildren<LineRenderer>();
+        laserRenderer.SetWidth(width, width);
+        laserRenderer.material.SetTextureScale("_MainTex", new Vector2(0.05f, 1.0f));
+    }
+
+    // Update is called once per frame
+    void FixedUpdate()
+    {
+        if (isFired)
+        {
+            if (animate)
+            {
+                laserRenderer.material.SetTextureOffset("_MainTex", new Vector2(-3 * Time.time, 0.0f));
+            }
+            RaycastHit hit;
+            if (Physics.Raycast(transform.position, transform.forward, out hit, maxLength))
+            {
+                laserRenderer.SetPosition(1, new Vector3(0f, 0f, hit.distance / transform.lossyScale.z));
+            }
+            else
+            {
+                laserRenderer.SetPosition(1, new Vector3(0f, 0f, maxLength / transform.lossyScale.z));
+            }
+        }
+        else
+        {
+            laserRenderer.SetPosition(1, new Vector3(0f, 0f, 0f));
+        }
+
+    }
+}

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