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How can I assign a material to all LODs?


I wrote the following function for the constructor of my StaticMesh class to assign a material instance (of the already assigned material) to the model which can be tinted with any color:

 void ASomPickup::UpdateMaterials()
     //Get Original Material
     if (Pickup_Material_Origin == NULL && !EnvironmentMesh->GetMaterial(0)->IsA(UMaterialInstanceDynamic::StaticClass()))
         Pickup_Material_Origin = EnvironmentMesh->GetMaterial(0);
     //Get and assign Material Instance
     if (Pickup_Material_Origin != NULL)
         if (Pickup_Material == NULL)
             Pickup_Material = UMaterialInstanceDynamic::Create(Pickup_Material_Origin, this);
             Pickup_Material->SetVectorParameterValue(FName(TEXT("Tint")), ColorTint);
         TArray<UMaterialInterface*> CompMats;
         if (EnvironmentMeshComponent != NULL)
             CompMats = EnvironmentMeshComponent->GetMaterials();
             for (int32 iMats = 0; iMats < CompMats.Num(); iMats++)
                 EnvironmentMeshComponent->SetMaterial(iMats, Pickup_Material);

Now the problem is that the tint only seems to have effect on the highest/"nearest" LOD of the model (LOD 0). It seems that the lower LODs don't have the new instanced material assigned to them.

alt text

Any help is appreciated.

Product Version: UE 4.7
shirtlods.jpg (51.0 kB)
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asked May 23 '15 at 01:30 PM in C++ Programming

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It seems this guy had the same question and got it resolved. Check it out. It's blueprint but you can easily trnsfer the logic to C++


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answered May 23 '15 at 01:36 PM

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avatar image Pseudocorpus May 23 '15 at 02:25 PM

Thanks maparizeau! Your answer pushed me to the right direction.

In line 23 I checked for the Number of elements on the StaticMeshComponent:

 CompMats = EnvironmentMeshComponent->GetMaterials();

I logged it, and it did spit out "1". That obvioiusly couldn't be right, since I have multiple LODs. Instead I should have checked for the Number of material elements on the Mesh of the StaticMeshComponent:

 CompMats = EnvironmentMeshComponent->StaticMesh->Materials;

Now it seems to work perfectly. Thanks again!

avatar image maparizeau May 23 '15 at 02:26 PM

my pleasure and happy game deving ;)

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