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Sharing Dynamic Material Instances

I have an actor with many attached StaticMeshActors. I want to modify the materials for all of them at runtime. I could get all the attached actors, and ForEach create a new Dynamic Material Instance, and modify that instance as desired. However, if I have 1500 meshes sharing 100 materials, I really only need to create 100 Dynamic Material Instances, not 1500.

I'd appreciate any advice on how to construct a Blueprint script that:

  • Creates a map/hash/association that can associate dynamic instances to materials.

  • ForEach of the attached actors, finds the material used.
    • If there is not already a dynamic instance associated with the material, it
      • creates a dynamic instance,

      • customizes it,

      • associates it in the map/hash,

      • and sets the actor to use it

    • If there is already a dynamic instance, sets the actor to use it

Alternatively (less optimal, but maybe easier to author?) it could be:

  • Find all the attached actors (1500 of them)

  • Find the unique set of materials they use (100 of them)

  • ForEach of the materials, create a Dynamic Material Instance with my own customizations.
    • Store these in a map/hash from original material to dynamic instance.

  • ForEach of the attached actors, replace the original material with the associated dynamic instance.

Product Version: UE 4.16
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asked Feb 06 '18 at 04:29 PM in Blueprint Scripting

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Gavin.Kistner
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when you create the dynamic material instance, right click the bluepin on the right and promote it to a variable. Then set that variable in the foreach loop for all of them instead of creating a new one everytime. Any change you make the parameters in that variable will affect all of them.

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answered Feb 07 '18 at 02:10 AM

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ViceVersa
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avatar image Gavin.Kistner Feb 07 '18 at 05:23 PM

Thanks for your reply. Can you be more explicit? Imagine that I have three meshes, A, B, and C. Meshes A and C use material M1, mesh B uses material M2. In my ForEach loop, when I get to C, how do I find out that there's already a dynamic instance based on M1 and apply that material instance to C, instead of creating a new dynamic instance and variable?

What I understand you to suggest is the following, which (AFAICT) makes a new value for the variable each loop. How do I associate the dynamic instance with the original material?

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