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Question by Vid-Maddness · Oct 18, 2016 at 12:21 AM · c#guiperformanceprofilerperformance optimization

Horrible Lag spike when Looking at an object that's showing GUI

I have a battery pickup script that shows the text "Press E to pickup" when your looking at it. But for some reason it causes horrible lag and i don't know why. Here's the code. C#

 using UnityEngine;
 using System.Collections;
 
 public class battries : MonoBehaviour {
 
     public float a;
     public float b;
     public float c;
     public float d;
 
     public bool showText;
     public int Bat;
 
     public GameObject Flight;
     public int mainBat;
 
     public bool safeRemove;
 
     void Start()
     {
         showText = false;
     }
 
     void OnTriggerStay(Collider other)
     {
         showText = true;
         if (!safeRemove)
         {
             if (Input.GetKeyUp(KeyCode.E))
             {
                 mainBat = Flight.GetComponent<flashlight>().batLevel;
                 Bat = 100;
                 Flight.GetComponent<flashlight>().batLevel = Bat += mainBat;
                 safeRemove = true;
 
                 if (safeRemove)
                 {
                     Destroy(this.gameObject);
                 }
             }
         }
     }
 
     void OnTriggerExit(Collider other)
     {
         showText = false;
     }
 
     void OnGUI()
     {
         if (showText)
         {
             GUI.Box(new Rect(Screen.width / 2.55f, Screen.height / 124.98f, Screen.width / 3.78f, Screen.height / 16.1f), "Press 'E' to pickup");
         }
     }
 
 }


Here's an image of the profiler

alt text

lag.png (117.3 kB)
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Answer by tom_coursow · Oct 18, 2016 at 06:47 AM

I guess it's not related to "looking at" the gameobject. The gameobject has a trigger stay Method (which gets called ever frame if there is a collision) in which you call GetComponent multiple times. GetComponent is a expensive operation. You might want to save flashlight OnStart() to a class variable and access this there instead of using get component.

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avatar image Vid-Maddness · Oct 23, 2016 at 01:03 AM 0
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I'm sorry but i don't understand how to fix this, i'm not good at c#

avatar image tom_coursow Vid-Maddness · Oct 23, 2016 at 11:41 AM 1
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 using UnityEngine;
 using System.Collections;
 
 public class battries : $$anonymous$$onoBehaviour {
 
     public float a;
     public float b;
     public float c;
     public float d;
 
     public bool showText;
     public int Bat;
 
     public GameObject FlightGO;
     private flashlight flight;
     public int mainBat;
 
     public bool safeRemove;
 
     void Awake() {
         flight = FlightGO.GetComponent<flashlight>();
     }
 
     void Start()
     {
         showText = false;
     }
 
     void OnTriggerStay(Collider other)
     {
         showText = true;
         if (!safeRemove)
         {
             if (Input.Get$$anonymous$$eyUp($$anonymous$$eyCode.E))
             {
                 mainBat = flight.batLevel;
                 Bat = 100;
                 flight.batLevel = Bat += mainBat;
                 safeRemove = true;
 
                 if (safeRemove)
                 {
                     Destroy(this.gameObject);
                 }
             }
         }
     }
 
     void OnTriggerExit(Collider other)
     {
         showText = false;
     }
 
     void OnGUI()
     {
         if (showText)
         {
             GUI.Box(new Rect(Screen.width / 2.55f, Screen.height / 124.98f, Screen.width / 3.78f, Screen.height / 16.1f), "Press 'E' to pickup");
         }
     }
 
 }
avatar image Vid-Maddness tom_coursow · Oct 23, 2016 at 08:00 PM 0
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I tried the code but the problem is still happening, it's better than before but it still happens alt text

lag2.png (201.9 kB)

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