Material Parameter Collections and Code?

[FrancoACT]

@Zelx7

Thank you, that did the trick :)!

Added a reference to the Collection Parameter and used that for the GetParameterCollectionInstance.
Found I could reference it as a UProperty and access from anywhere in my class found on https://docs.unrealengine.com/latest…rencingAssets/

So far though I’m wondering if this is the best method to do this or if there is another more efficient way? Since they list 4 of them and I’m still learning I’m not sure which of these is best for my case.

Hi. Just in case someone wonder how directly load de collection. But keep in mind the above warning about cooked content.

// Class variable
UMaterialParameterCollection* collection;
...
// Inside constructor:
...
ConstructorHelpers::FObjectFinder<UMaterialParameterCollection> objectType(TEXT("/Game/Project/Materials/MPC_Params"));
if (objectType.Succeeded())
{
collection = objectType.Object;
}
...
// when needed
UMaterialParameterCollectionInstance * pci = GetWorld()->GetParameterCollectionInstance(collection);
if (pci)
{
bool found = pci->SetVectorParameterValue(FName("ParamName"), FLinearColor(400, 400, 0, 0));
...
}
}