How to change the parameters of a Blendable Material from a PostProcessVolume?

Development Rendering
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1

I have a 0.0 to 1.0 GAMMA setting that I can set in a menu, and a “blendable” material set up as described here.

I have placed the blendable material into the blendables array of my post process volume.

I have a blueprint function that can successfully get that material.

I assumed that I need to use dynamic material instances to modify the parameter within that material and have tried to do so, but no change is visible.

I have tried using a parameter collection, with the same lack of effect.

I am unsure of how to proceed. Is there any existing examples of how to do this from start to finish?
Or even any clues as to what I am missing?

2

The only way to do this I have had success with is through a collection. Can you show the nodes you used for this?

3

The only way to do this I have had success with is through a collection. Can you show the nodes you used for this?

4

It is not currently connected but this is it:

39438-paramcollect.jpg

And here is the Material:

39439-gammamat.jpg

I was looking at the example [here][3], which does not mention a need to spawn or initialize the collection.

If I need to, I have been unable to find the related node.

5

I think this might help u

6

Sorry, i don’t know why but this topic has all wigged out on me. It double posted the answer and i get no notifications till now.

You don’t need to spawn or initialize anything, does your example above not work?

7

At some point in 4.6 (i think) the MID was broken and would not update. If this works now then this would be a good solution except for the fact that you would be required to do this per level transition if your post processing is controlled in each level. Using a collection guarantees it will be set for any postprocess component with the blendable plugged in.

8

This worked for me. Quick and easy!