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Question by Smireles · Mar 17, 2020 at 12:00 AM · c#post processingpost-process-effectmanipulation

How to manipulate PostProcessing effects settings during execution with c#?

I need to change the intensity value of my current Vignette effect depending in specific conditions.
So far I haven't been able to ac$$anonymous$$eve t$$anonymous$$s. Please help!

Image of what I want to ac$$anonymous$$eve:
alt text


My setup:

  • Unity 2019.3.5f1 with URP implemented

  • Post Processing Package (v2) installed

  • Scene with a GameObject + Volume component with Vignette and Bloom effect overrides added

  • A monobehaviour component script in the very same GameObject from above


My monobehaviour script:

 using UnityEngine;
 using UnityEngine.Rendering.PostProcessing;
 
 public class PostProcessingHandler : MonoBehaviour
 {
   private PostProcessVolume _ppv;
   private Vignette _vignette;
 
   // Vignette intensity values
   [SerializeField, Range(0f, 1f)]
   private float _lowIntensity = 0.25f;
   [SerializeField, Range(0f, 1f)]
   private float _$$anonymous$$ghIntensity = 0.5f;
 
   private void Start()
   {
     _ppv = GetComponent<PostProcessVolume>();
     Debug.Log(_ppv);
   }
 }


When I try to retrieve PostProcessingVolume component to get it's profile (and further layer manipulation) I always get "null".

Image of my setup: alt text


I've seen several guides/posts and even Unity documentation but I cannot get past that starting point of getting the PostProcessingVolume component, what am i missing?

question.jpg (199.0 kB)
desire.jpg (109.3 kB)
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Answer by JackMcComiskey6 · Nov 14, 2020 at 06:15 PM

I got t$$anonymous$$s working and during my search I came across t$$anonymous$$s Unity answers page so if for the sake of possibly helping someone in the future here is my code taken from t$$anonymous$$s video: https://www.youtube.com/watch?v=jg2I2odw51M

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Rendering;
 using UnityEngine.Rendering.PostProcessing;
 
 public class PostProcessControl : MonoBehaviour
 {
     // Start is called before the first frame update
 
     private PlayerController player;
     private Vignette vignette;
     private PostProcessVolume volume;
 
     void Start()
     {
         player = GameObject.Find("PlayerSprite").GetComponent<PlayerController>();
 
         volume = GetComponent<PostProcessVolume>();
 
         volume.profile.TryGetSettings(out vignette);
     }
 
     // Update is called once per frame
     void Update()
     {
         if (player.gameover)
         {
             vignette.intensity.value = Mathf.Lerp(vignette.intensity.value, 1, 1 * Time.deltaTime);
         }
     }
 }

My set up is the same as described in the OP. Note, in the linked video its mentioned to avoid using the package manager for downloading the post processing asset. I did NOT encounter t$$anonymous$$s issue with Unity 2019.2.6f1 and post-processing version 3.0.1

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avatar image TreyH · Nov 15, 2020 at 01:43 AM 1
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This is the right idea, although do be careful about modifying the volume stuff as-is. I don't remember which version of PP the PostProcessVolume corresponds to, but those are usually scriptable objects and modifications will persist in the editor after play ends.

For things like that or TerrainData, you can create a runtime version and mess with that one instead. My setup for working with Beautify on the newer PP stack:

 void Awake()
 {
     this.runtimeProfile = Instantiate(this.volumeComponent.profile);
     this.volumeComponent.profile = this.runtimeProfile;
 
     this.runtimeProfile.TryGet<Beautify.Universal.Beautify>(out this.beautifySettings);
 }
 
 void OnDestroy()
 {
     Destroy(this.runtimeProfile);
 }

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