Resolved Updating film grain during runtime

Hello,
I have a project where I'd like to change the grain intensity and type during runtime.
I have successfully changed other parts of the Volume such as HDRISky, Fog and Exposure, however I cannot seem to change the FilmGrain.

At start I run:

Code (CSharp):

1. volume = GameObject.Find("StageRandomizer").GetComponent<Volume>();
2. volume.profile.TryGet(out grain);

My try to change the grain:

Code (CSharp):

1. grain.active = true;
2. ClampedFloatParameter intensity = new ClampedFloatParameter(Random.Range(minGrain, maxGrain), 0.0f, 1.0f, true);
3. grain.intensity = intensity;
4.  
5. int index = Random.Range(1, 10);
6.  
7. FilmGrainLookupParameter fglp = new FilmGrainLookupParameter((FilmGrainLookup)index, true);
8. grain.type = fglp;

I have yet to figure out how this works, have anyone of you guys had any success with this?


Thanks,
Daniel Fennhagen

 

For most of these post processing settings, you don't assign a new value to the property. Instead, you call Override() on the property. For example:

Code (CSharp):

1. FilmGrain _postProcessingFilmGrain;
2.  
3. void Update() {
4.     _postProcessingFilmGrain.intensity.Override(_someFloatValue);
5. }

 

Thank you @dgoyette, this did solve my problem!

 

For those who can't find the Film Grain while working with URP (Universal Render Pipeline), you will need to import URP first :

Code (CSharp):

1. using UnityEngine.Rendering.Universal;

 

What´s the difference between

_postProcessingFilmGrain.intensity.Override(_someFloatValue);
and
_postProcessingFilmGrain.intensity =_someFloatValue;
?

 

@Cascho01 I looked it up in the code. As you can see in com.unity.render-pipelines.core\Runtime\Volume\VolumeParameter.cs, the Override() sets an extra bool, which signifies that the volume parameter has changed. (And it probably gets an extra Update because of that) -> Whenever regular value setting does not work, use the Override().

 

Hmmm, ok.

Besides this, when I change values at runtime, what´s the best way to set the values back to the original states after stopping playmode?

 

I am assuming you are talking about ScriptableObject based Assets such as Volume Profiles. The best way to "reset" those changes is to make a duplicate of that asset before you enter Playmode. You could also script that to automate, otherwise there's no way. All changes within the scene will be reset after stopping playmode anyways, but those assets outside the scene serialize their changes by design. So just be aware, which of these you are dealing with when changing something in playmode.