Set bp variable via c++?

Development Programming & Scripting Blueprint
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1

Hello,
could someone tell me how I can set a bp variable with c++?

2

using UE reflection system :

bool SetFloatByName(UObject * Target, FName VarName)
{
    UFloatProperty* FloatProp = FindField<UFloatProperty>(Target->GetClass(), VarName);
    if (FloatProp)
    {
        FloatProp->SetPropertyValue_InContainer(Target, NewValue);
        return true;
    }
    return false;
}

you have Bool/Float/Int/Object Properties classes availliable, choose the one you need

Using reflection is expensive, so avoid it as much as possible, especially in hot paths, ( you can also cache fields )

3

Do you know what the best way is to get a value that has been calculated via c++ in my anim bp?

4

Sure, make a new class based on “UAnimInstance” ( cpp name base class of Animation blueprint)
ex:
class YOURGAME_API UBaseEnemiesAnimBlueprint : public UAnimInstance
{
virtual void NativeInitializeAnimation() override; //BeginPlay

virtual void NativeUpdateAnimation(float DeltaTimeX) override; //Tick

//
// velocity
//
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Data)
	float Speed;
}

and reparent your animation blueprint on that. so you can have a shared base with variable for all your units and just the differences added on top in blueprint

Uproperties taged with “BlueprintReadWrite” will be readable in animation blueprint :slight_smile: