Code cleanup

Assets/Scenes/CameraGrain/CameraGrain.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-using UnityEngine.XR.ARFoundation;
+using UnityEngine;
-    public class CameraGrain: MonoBehaviour
+    public class CameraGrain : MonoBehaviour
-            get { return m_CameraManager; }
-            set { m_CameraManager = value; }
+            get => m_CameraManager;
+            set => m_CameraManager = value;
         }
 
         Renderer m_Renderer;
-            if(m_CameraManager == null)
+            if (m_CameraManager == null)
-                m_CameraManager = FindObjectOfType (typeof(ARCameraManager)) as ARCameraManager;
+                m_CameraManager = FindObjectOfType<ARCameraManager>();
             }
 
             m_Renderer = GetComponent<Renderer>();
             m_CameraManager.frameReceived -= OnReceivedFrame;
         }
 
-        void OnReceivedFrame(ARCameraFrameEventArgs eventArgs){
-            if(m_Renderer != null && eventArgs.cameraGrainTexture != null)
+        void OnReceivedFrame(ARCameraFrameEventArgs eventArgs)
+        {
+            if (m_Renderer && eventArgs.cameraGrainTexture)
             {
                 m_Renderer.material.SetTexture("_NoiseTex", eventArgs.cameraGrainTexture);
                 m_Renderer.material.SetFloat("_NoiseIntensity", eventArgs.noiseIntensity);
-}
+}