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Change global material parameter

I can change dynamic material instance parameter in blueprint. However, let's say i have a thousand instances of a grass patch BP, and that wind speed or direction is a material instance parameter. How would I change the global material's parameter, so that it affects every grass patch ? I imagine having a dynamic material instance for each one when the parameter is the same for every one is quite wasteful and possibly slow.

Another use case would be for changing a cubemap from day/night on all buildings in the scene, i wouldnt want to give each building a dynamic material instance, when it's a global change. Or when it's raining, you'd want all outdoor materials to have an additional wet layer.

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asked Apr 05 '14 at 12:51 AM in Blueprint Scripting

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2 answers: sort voted first

Look into Material Parameter Collection. You can use a general parameter for a collection in your base material and change it in run time via Blueprints.

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answered Apr 05 '14 at 12:56 AM

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Try using Material Parameter Collections. You can create them in content browser and define parameters. Then you can reference those parameters in blueprints and materials.

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answered Apr 05 '14 at 12:57 AM

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avatar image Tansien Apr 05 '14 at 01:48 AM

How would you apply the collection globally ? There isn't much docs on Material Parameter Collections.

avatar image Jacky Apr 05 '14 at 02:10 AM

Create a Material Parameter Collection in the content browser and set a Scalar parameter inside it, then create a Collection Parameter node in the material, for roughness lets say, and pick the collection and parameter you created. Finally you can go to the level blueprint, create a Set Scalar Parameter Value node and execute it whenever you like by using a timeline to make the transition.

For this to work properly for your situation you may want to multiply the collection parameter with material instances' scalar value though, instead of using a single value for the mat. instance.

avatar image Tansien Apr 05 '14 at 02:23 AM

This does exactly what i wanted ! I've marked your answer as accepted, thanks !

avatar image Moonmana Apr 01 '17 at 08:00 AM

[1]: /storage/temp/132406-7624b2ff76ccfb94b80ac1f114b3392f.png

Right is how it is in the tutorial Left is what i see when i double click my collection. No details, can't do anything

avatar image lucabelluccini Mar 19 '15 at 09:24 PM

Is it possible to use a Material Parameter Collection per Material Instance?

avatar image BoisterousGaming Jul 24 '15 at 05:52 AM

I would also like to know if it is possible to use a Material Parameter Collection per Material Instance!!!

avatar image Tom Shannon Oct 22 '15 at 10:38 PM

That would be done through a Material Instance parameter. Material parameters are great for modifying individual actors/materials, Material parameter Collections are great for modifying things globally.

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