Changing post processing values programmatically when Time.TimeScale = 0 does nothing

Graphics Post-Processing
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1

I’m trying to implement some graphical settings sliders into the Pause menu of a game I’m working on. Two of these settings are ‘Contrast’ and ‘Brightness’ in the ‘Color Adjustments’ component of a Volume Profile. Weirdly though, these both act differently in my pause menu when Time.TimeScale is set to 0.

A simplified version of my code is:

private void Start()
{
    volumeProfile.TryGet(out colorAdjustments);
    
    if (contrastSetting != null)
    {
        AdjustContrast(contrastSetting.Value);
        contrastSetting.OnTypedValueChanged += (value) => AdjustContrast(value);
    }

    if (brightnessSetting != null)
    {
        AdjustBrightness(brightnessSetting.Value);
        brightnessSetting.OnTypedValueChanged += (value) => AdjustBrightness(value);
    }
}

public void AdjustContrast(float contrastValue)
{
    if (colorAdjustments == null) return;
    
    colorAdjustments.contrast.Override(contrastValue);
}

public void AdjustBrightness(float brightnessValue)
{
    if (colorAdjustments == null) return;
    Color c = colorAdjustments.colorFilter.value;
    c.r = brightnessValue;
    c.g = brightnessValue;
    c.b = brightnessValue;

    colorAdjustments.colorFilter.Override(c);
}

When moving the Brightness slider, the visual brightness updates instantly. But when moving the Contrast slider nothing visually happens until I exit the pause menu, which sets the Time.TimeScale to 1, and the contrast lerps to the value that I set.

I also noticed that changing the Contrast in the inspector directly also lerps the contrast visually, which solidified to me that updating this value relies on Time.TimeScale being non-zero.

Is this a bug? Is there a way to update these Post Processing settings instantly, without having to rely on Time.TimeScale being a non-zero number?

2

Check if manually rendering helps. If so you could do that every time the slider value changes.