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

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?

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asked Apr 19 '15 at 05:17 AM in Blueprint Scripting

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Erdrik
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3 answers: sort voted first
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answered Jun 30 '15 at 04:41 PM

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devilhiyan
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avatar image RimmyD Jun 30 '15 at 05:53 PM

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.

avatar image Element457 Jul 13 '15 at 03:08 PM

This worked for me. Quick and easy!

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

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answered Apr 20 '15 at 04:10 PM

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

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answered Apr 20 '15 at 04:11 PM

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RimmyD
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avatar image Erdrik Apr 20 '15 at 04:48 PM

It is not currently connected but this is it:

alt text

And here is the Material:

alt text

I was looking at the example here, 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.

paramcollect.jpg (24.4 kB)
gammamat.jpg (45.1 kB)
avatar image RimmyD Jun 30 '15 at 05:50 PM

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?

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