c++ - Unreal Engine 4 C++ 更改 AStaticMeshActor 的 StaticMeshComponent

Question

我正在尝试更改每个静态网格物体 Actor 的 Material 属性。我知道我需要迭代每个 Actor 并找到静态网格体组件。但是，我无法正确修改 Material 。

这是我的代码，

GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("START Modeling()"));

//Find Actor and change Material
UWorld* world = GetWorld();

//Material Path
FString matPath = "Material'/Game/StarterContent/Materials/M_Metal_Gold.M_Metal_Gold'";
//Material Instance
UMaterialInstanceConstant* material = Cast<UMaterialInstanceConstant>(StaticLoadObject(UMaterialInstanceConstant::StaticClass(), nullptr, *(matPath)));
//Iterate Every Static Mesh Actor
for (TActorIterator<AStaticMeshActor> ActorItr(world); ActorItr; ++ActorItr)
{
    AStaticMeshActor *Mesh = *ActorItr;
    //Just for Degbuging Purpose
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Actor: %s"), *(ActorItr->GetName())));
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Location: %s"), *(ActorItr->GetActorLocation().ToString())));
    //Get Static Mesh Component
    TArray<UStaticMeshComponent*> MaterialComps;
    Mesh->GetComponents(MaterialComps);
    //I get this code from community answer. I do not know how it works.
    for (int32 Index = 0; Index != MaterialComps.Num(); ++Index)
    {
        UStaticMeshComponent* targetComp = MaterialComps[Index];
        int32 mCnt = targetComp->GetNumMaterials();
        for (int i = 0; i < mCnt; i++)
                    //This is the core code which actually changing material.
            targetComp->SetMaterial(0, material);
    }

}

之前 之后

我之所以想到这一点，是因为我正在通过迭代来改变每个 Actor 。
然而，它只会改变地板 Actor 的 Material 。

Answer 1

您仅更改索引为 0 的 Material 。

将targetComp->SetMaterial(0,material);更改为targetComp->SetMaterial(i,material);。它应该可以解决您的问题。