Dynamic Material has no affect on the material

General Feedback & Requests
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1

Hello,

I am fairly new to Unreal Engine 5, and I am working on making a dynamic material that changes on a value I calculate called Refelxivity.

Here is what I added in the .cpp file


void AActor::AMaterialInstanceDynamicChange()
{
	 PrimaryActorTick.bCanEverTick = true;
	 
	 MeshComponent= CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MeshComponent"));
	 RootComponent=MeshComponent;
	 
}

void AActor::BeginPlay()
{
  Super::BeginPlay();
 M_Reflexivity = MeshComponent->GetMaterial(0);
  ReflexivityMID = UMaterialInstanceDynamic::Create(M_Reflexivity, this);
  MeshComponent->SetMaterial(0, ReflexivityMID);
}

void AActor::CalculateIntensity(...)
{
TRACE_CPUPROFILER_EVENT_SCOPE(ParallelFor); // 10ms instead of 30ms
  ParallelFor(Locations.Num(), [&](int32 i)
  {
  Intensities[i] = ...
  
      float Reflexivity = -0.2130 + 0.0698 * Intensities[i]; //Lambertian Target Reflectance of a Material at an angle of 0 deg
      ReflexivityMID->SetScalarParameterValue(TEXT("Reflexivity"),Reflexivity);
      UE_LOG(LogTemp, Warning, TEXT("Reflexivity = %f"),Reflexivity);
      
      Reflexivities.Add(Reflexivity);
  });
}

And in the .h file


UMaterialInterface* M_Reflexivity;
  
  UPROPERTY(VisibleAnywhere)
  UStaticMeshComponent* MeshComponent;

I then connect the “Reflexivity” scalar parameter to the emissive colour output of Material Editor.
But I see no difference in the actual material when I simulate this. Please help me out here. Thanks!